{
  "problem_id": "auto_problem_098",
  "problem_text": "PROBLEM: Truss optimization problem (ground structure variant 98)\n\nINITIAL STRUCTURE:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nLOADING:\n  Joint J3: Force=(0, -31095, 0) N\n  Joint J4: Force=(0, -70327, 0) N\n  Joint J5: Force=(0, -78734, 0) N\n\nDESIGN GOALS:\n  - Minimum Factor of Safety (buckling): 1.5\n  - Minimum Factor of Safety (yielding): 1.5\n  - Maximum allowable mass: 322.55 kg\n  - Objective: Minimize mass while satisfying FOS constraints",
  "correct_answer": "Optimal feasible solution found via LP",
  "tree_type": "modification",
  "root_id": "node_0",
  "total_nodes": 3487,
  "max_depth": 8,
  "nodes": {
    "node_0": {
      "node_id": "node_0",
      "content": "INITIAL DESIGN (Trace 0)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1": {
      "node_id": "node_1",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n\nPerformance:\n  Mass: 227.18 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.59e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.18426152383867,
      "fos_buckling": 0.9537839686395382,
      "fos_yielding": 1.9827457451845316,
      "deflection": 0.005587693649948551,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004158)"
      },
      "parent_node_id": "node_0",
      "improvement_over_parent": null
    },
    "node_2": {
      "node_id": "node_2",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n\nPerformance:\n  Mass: 254.02 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.0210786175811,
      "fos_buckling": 1.3540803821691687,
      "fos_yielding": 1.7449454647187121,
      "deflection": 0.004653713125326501,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004465)"
      },
      "parent_node_id": "node_1",
      "improvement_over_parent": null
    },
    "node_3": {
      "node_id": "node_3",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.33 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3284691669012,
      "fos_buckling": 1.5233102835833792,
      "fos_yielding": 2.013174897803476,
      "deflection": 0.004039288820415917,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_2",
      "improvement_over_parent": null
    },
    "node_4": {
      "node_id": "node_4",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3",
      "improvement_over_parent": null
    },
    "node_5": {
      "node_id": "node_5",
      "content": "INITIAL DESIGN (Trace 1)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 147.94 kg\n  Factor of Safety: 0.71\n  Max Deflection: 9.87e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.93615705487102,
      "fos_buckling": 0.7110094167531389,
      "fos_yielding": 1.5117647627809734,
      "deflection": 0.009867552714077146,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_6": {
      "node_id": "node_6",
      "content": "MODIFICATION: Increase 1 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 151.63 kg\n  Factor of Safety: 0.71\n  Max Deflection: 9.31e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.62860291394006,
      "fos_buckling": 0.7108281802151744,
      "fos_yielding": 1.5117647627809734,
      "deflection": 0.009307128315250102,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.245)"
      },
      "parent_node_id": "node_5",
      "improvement_over_parent": null
    },
    "node_7": {
      "node_id": "node_7",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 184.01 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.69e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.01401405702296,
      "fos_buckling": 0.8399556673354486,
      "fos_yielding": 1.833466173505996,
      "deflection": 0.007685991575383891,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.229)"
      },
      "parent_node_id": "node_6",
      "improvement_over_parent": null
    },
    "node_8": {
      "node_id": "node_8",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 204.74 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.36e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.74367847635634,
      "fos_buckling": 0.8933816323262977,
      "fos_yielding": 1.833466173505996,
      "deflection": 0.006364955145761371,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003935)"
      },
      "parent_node_id": "node_7",
      "improvement_over_parent": null
    },
    "node_9": {
      "node_id": "node_9",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 229.54 kg\n  Factor of Safety: 1.20\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.54120310165032,
      "fos_buckling": 1.203312016069161,
      "fos_yielding": 1.6055579501037396,
      "deflection": 0.005230193614160632,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004100)"
      },
      "parent_node_id": "node_8",
      "improvement_over_parent": null
    },
    "node_10": {
      "node_id": "node_10",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 286.94 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.20e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.9437722650736,
      "fos_buckling": 1.4712094133622704,
      "fos_yielding": 2.0037813824318293,
      "deflection": 0.004195842880562714,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.274)"
      },
      "parent_node_id": "node_9",
      "improvement_over_parent": null
    },
    "node_11": {
      "node_id": "node_11",
      "content": "MODIFICATION: Increase 5 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0059)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 289.56 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.5569206260054,
      "fos_buckling": 1.440707575846449,
      "fos_yielding": 2.514149790881718,
      "deflection": 0.00415391430445086,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.297)"
      },
      "parent_node_id": "node_10",
      "improvement_over_parent": null
    },
    "node_12": {
      "node_id": "node_12",
      "content": "MODIFICATION: Increase 1 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0059)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 294.91 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.91365637464105,
      "fos_buckling": 1.4876451320696265,
      "fos_yielding": 2.5351649147959217,
      "deflection": 0.004047760955739501,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.198)"
      },
      "parent_node_id": "node_11",
      "improvement_over_parent": null
    },
    "node_13": {
      "node_id": "node_13",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_12",
      "improvement_over_parent": null
    },
    "node_14": {
      "node_id": "node_14",
      "content": "INITIAL DESIGN (Trace 2)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 165.84 kg\n  Factor of Safety: 0.65\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.8447346353146,
      "fos_buckling": 0.6452210137842749,
      "fos_yielding": 1.3266464704842336,
      "deflection": 0.010168948935978304,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_15": {
      "node_id": "node_15",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n\nPerformance:\n  Mass: 168.85 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.97e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.84791761480585,
      "fos_buckling": 0.9506917929966241,
      "fos_yielding": 1.1620718372227479,
      "deflection": 0.0069665916584650475,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001830)"
      },
      "parent_node_id": "node_14",
      "improvement_over_parent": null
    },
    "node_16": {
      "node_id": "node_16",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n\nPerformance:\n  Mass: 210.70 kg\n  Factor of Safety: 1.16\n  Max Deflection: 5.60e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.6999510372277,
      "fos_buckling": 1.1552202530211315,
      "fos_yielding": 1.448743140113178,
      "deflection": 0.005596424120992973,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.264)"
      },
      "parent_node_id": "node_15",
      "improvement_over_parent": null
    },
    "node_17": {
      "node_id": "node_17",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 254.32 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.32112728134754,
      "fos_buckling": 1.3554270685664496,
      "fos_yielding": 1.7469567719772863,
      "deflection": 0.0046482944401701615,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_16",
      "improvement_over_parent": null
    },
    "node_18": {
      "node_id": "node_18",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.21 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2132188183785,
      "fos_buckling": 1.5228462873058066,
      "fos_yielding": 2.012346207157759,
      "deflection": 0.004040841628752694,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.168)"
      },
      "parent_node_id": "node_17",
      "improvement_over_parent": null
    },
    "node_19": {
      "node_id": "node_19",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_18",
      "improvement_over_parent": null
    },
    "node_20": {
      "node_id": "node_20",
      "content": "INITIAL DESIGN (Trace 3)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 133.13 kg\n  Factor of Safety: 0.55\n  Max Deflection: 9.97e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 133.12959049615145,
      "fos_buckling": 0.5515465977747859,
      "fos_yielding": 0.9984062940993049,
      "deflection": 0.009974530926466496,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_21": {
      "node_id": "node_21",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 159.44 kg\n  Factor of Safety: 0.65\n  Max Deflection: 8.34e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.4408821875955,
      "fos_buckling": 0.6486743503057936,
      "fos_yielding": 1.1949657926818853,
      "deflection": 0.008342095785679725,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.208)"
      },
      "parent_node_id": "node_20",
      "improvement_over_parent": null
    },
    "node_22": {
      "node_id": "node_22",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n\nPerformance:\n  Mass: 174.89 kg\n  Factor of Safety: 0.98\n  Max Deflection: 6.73e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.88734450586256,
      "fos_buckling": 0.9809554993506316,
      "fos_yielding": 1.20348237939131,
      "deflection": 0.0067284271357179164,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002878)"
      },
      "parent_node_id": "node_21",
      "improvement_over_parent": null
    },
    "node_23": {
      "node_id": "node_23",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n\nPerformance:\n  Mass: 223.44 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.28e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.44331473195223,
      "fos_buckling": 1.2150646396984655,
      "fos_yielding": 1.535934651359285,
      "deflection": 0.005281198034225793,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.297)"
      },
      "parent_node_id": "node_22",
      "improvement_over_parent": null
    },
    "node_24": {
      "node_id": "node_24",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n\nPerformance:\n  Mass: 261.13 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.53e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 261.1326946830545,
      "fos_buckling": 1.3854925872779638,
      "fos_yielding": 1.7934840761772468,
      "deflection": 0.004528863882950286,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.183)"
      },
      "parent_node_id": "node_23",
      "improvement_over_parent": null
    },
    "node_25": {
      "node_id": "node_25",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 292.98 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.98032903055605,
      "fos_buckling": 1.5218650529005062,
      "fos_yielding": 2.0107732195009755,
      "deflection": 0.004044024527247199,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.134)"
      },
      "parent_node_id": "node_24",
      "improvement_over_parent": null
    },
    "node_26": {
      "node_id": "node_26",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_25",
      "improvement_over_parent": null
    },
    "node_27": {
      "node_id": "node_27",
      "content": "INITIAL DESIGN (Trace 4)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 159.05 kg\n  Factor of Safety: 0.66\n  Max Deflection: 8.14e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.04750590969334,
      "fos_buckling": 0.6629023641545083,
      "fos_yielding": 1.2241333867470816,
      "deflection": 0.008143743830292916,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_28": {
      "node_id": "node_28",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 186.08 kg\n  Factor of Safety: 0.76\n  Max Deflection: 6.97e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.08031262483092,
      "fos_buckling": 0.7606478492542892,
      "fos_yielding": 1.4312578552810444,
      "deflection": 0.0069723863270606075,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.181)"
      },
      "parent_node_id": "node_27",
      "improvement_over_parent": null
    },
    "node_29": {
      "node_id": "node_29",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 225.98 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.76e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.97832481391848,
      "fos_buckling": 0.8971051874208787,
      "fos_yielding": 1.7364600548212772,
      "deflection": 0.005755613054427743,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.232)"
      },
      "parent_node_id": "node_28",
      "improvement_over_parent": null
    },
    "node_30": {
      "node_id": "node_30",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n\nPerformance:\n  Mass: 254.53 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.64e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.5268804277216,
      "fos_buckling": 1.3564289699434142,
      "fos_yielding": 1.7485101224990616,
      "deflection": 0.0046444740066730016,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004609)"
      },
      "parent_node_id": "node_29",
      "improvement_over_parent": null
    },
    "node_31": {
      "node_id": "node_31",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.45 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.44682782407796,
      "fos_buckling": 1.5239152088718309,
      "fos_yielding": 2.0141067541916398,
      "deflection": 0.004037578196358281,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.168)"
      },
      "parent_node_id": "node_30",
      "improvement_over_parent": null
    },
    "node_32": {
      "node_id": "node_32",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_31",
      "improvement_over_parent": null
    },
    "node_33": {
      "node_id": "node_33",
      "content": "INITIAL DESIGN (Trace 5)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_34": {
      "node_id": "node_34",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 208.14 kg\n  Factor of Safety: 0.92\n  Max Deflection: 5.99e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.14485659372787,
      "fos_buckling": 0.9213637796212971,
      "fos_yielding": 1.9010813447727228,
      "deflection": 0.005990211349745901,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003973)"
      },
      "parent_node_id": "node_33",
      "improvement_over_parent": null
    },
    "node_35": {
      "node_id": "node_35",
      "content": "MODIFICATION: Increase 8 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0081)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 227.45 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.35e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.4531221448713,
      "fos_buckling": 1.2524945317651204,
      "fos_yielding": 1.9010813447727228,
      "deflection": 0.005353215393602157,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.590)"
      },
      "parent_node_id": "node_34",
      "improvement_over_parent": null
    },
    "node_36": {
      "node_id": "node_36",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0081)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 253.19 kg\n  Factor of Safety: 1.23\n  Max Deflection: 4.70e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.1871074430914,
      "fos_buckling": 1.2299505002435485,
      "fos_yielding": 1.7072130736850697,
      "deflection": 0.004696714987841719,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004267)"
      },
      "parent_node_id": "node_35",
      "improvement_over_parent": null
    },
    "node_37": {
      "node_id": "node_37",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0100)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 304.22 kg\n  Factor of Safety: 1.43\n  Max Deflection: 3.92e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 304.2201880338827,
      "fos_buckling": 1.4338218775021503,
      "fos_yielding": 2.052221833377374,
      "deflection": 0.003916688644574444,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_36",
      "improvement_over_parent": null
    },
    "node_38": {
      "node_id": "node_38",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_37",
      "improvement_over_parent": null
    },
    "node_39": {
      "node_id": "node_39",
      "content": "INITIAL DESIGN (Trace 6)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 168.43 kg\n  Factor of Safety: 0.70\n  Max Deflection: 7.88e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.43254752145194,
      "fos_buckling": 0.70140778482368,
      "fos_yielding": 1.2881987672797932,
      "deflection": 0.007879856925506707,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_40": {
      "node_id": "node_40",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n\nPerformance:\n  Mass: 185.30 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.42e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.29892301395466,
      "fos_buckling": 0.9147724602270774,
      "fos_yielding": 1.2967496070096898,
      "deflection": 0.006415967697719835,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003158)"
      },
      "parent_node_id": "node_39",
      "improvement_over_parent": null
    },
    "node_41": {
      "node_id": "node_41",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n\nPerformance:\n  Mass: 221.84 kg\n  Factor of Safety: 1.08\n  Max Deflection: 5.37e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.84365198768947,
      "fos_buckling": 1.075628322039926,
      "fos_yielding": 1.5509233761449877,
      "deflection": 0.005369551505078007,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.211)"
      },
      "parent_node_id": "node_40",
      "improvement_over_parent": null
    },
    "node_42": {
      "node_id": "node_42",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 284.86 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.20e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 284.86208070868554,
      "fos_buckling": 1.3378907121602,
      "fos_yielding": 1.987980283063985,
      "deflection": 0.004195704883805421,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.311)"
      },
      "parent_node_id": "node_41",
      "improvement_over_parent": null
    },
    "node_43": {
      "node_id": "node_43",
      "content": "MODIFICATION: Increase 10 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0063)]\n\nPerformance:\n  Mass: 290.74 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.7363929039476,
      "fos_buckling": 1.3358002571235539,
      "fos_yielding": 1.9884886879858157,
      "deflection": 0.004152741893765442,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.256)"
      },
      "parent_node_id": "node_42",
      "improvement_over_parent": null
    },
    "node_44": {
      "node_id": "node_44",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_43",
      "improvement_over_parent": null
    },
    "node_45": {
      "node_id": "node_45",
      "content": "INITIAL DESIGN (Trace 7)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0018)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 135.97 kg\n  Factor of Safety: 0.61\n  Max Deflection: 1.05e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 135.97404500427191,
      "fos_buckling": 0.6106126818776206,
      "fos_yielding": 1.1362912302492372,
      "deflection": 0.010503575201087122,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_46": {
      "node_id": "node_46",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0023)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 157.65 kg\n  Factor of Safety: 0.70\n  Max Deflection: 9.06e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.65494478638664,
      "fos_buckling": 0.6961682974563317,
      "fos_yielding": 1.3160100278519273,
      "deflection": 0.009064926077409528,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.168)"
      },
      "parent_node_id": "node_45",
      "improvement_over_parent": null
    },
    "node_47": {
      "node_id": "node_47",
      "content": "MODIFICATION: Increase 0 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 162.09 kg\n  Factor of Safety: 0.70\n  Max Deflection: 8.28e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.08618226078073,
      "fos_buckling": 0.6959555059692025,
      "fos_yielding": 1.3159427840497109,
      "deflection": 0.00828319681516205,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.326)"
      },
      "parent_node_id": "node_46",
      "improvement_over_parent": null
    },
    "node_48": {
      "node_id": "node_48",
      "content": "MODIFICATION: Increase 8 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 169.25 kg\n  Factor of Safety: 0.70\n  Max Deflection: 8.09e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.24936579445034,
      "fos_buckling": 0.6956117992666092,
      "fos_yielding": 1.2925079430004112,
      "deflection": 0.00808953902480619,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.590)"
      },
      "parent_node_id": "node_47",
      "improvement_over_parent": null
    },
    "node_49": {
      "node_id": "node_49",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n\nPerformance:\n  Mass: 185.96 kg\n  Factor of Safety: 1.05\n  Max Deflection: 6.37e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.9592600286827,
      "fos_buckling": 1.050321963798709,
      "fos_yielding": 1.3022721660105494,
      "deflection": 0.006373324793803871,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003127)"
      },
      "parent_node_id": "node_48",
      "improvement_over_parent": null
    },
    "node_50": {
      "node_id": "node_50",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n\nPerformance:\n  Mass: 224.18 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.30e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.17747835370056,
      "fos_buckling": 1.2348457297794981,
      "fos_yielding": 1.5682299464888436,
      "deflection": 0.005298020863807063,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.220)"
      },
      "parent_node_id": "node_49",
      "improvement_over_parent": null
    },
    "node_51": {
      "node_id": "node_51",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 288.41 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.13e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 288.40794980695455,
      "fos_buckling": 1.5213214036875917,
      "fos_yielding": 2.0138715070049806,
      "deflection": 0.004132739220456821,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.314)"
      },
      "parent_node_id": "node_50",
      "improvement_over_parent": null
    },
    "node_52": {
      "node_id": "node_52",
      "content": "MODIFICATION: Increase 0 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.31 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.308777757475,
      "fos_buckling": 1.5232042789136881,
      "fos_yielding": 2.0129016831337454,
      "deflection": 0.004039537848667368,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.185)"
      },
      "parent_node_id": "node_51",
      "improvement_over_parent": null
    },
    "node_53": {
      "node_id": "node_53",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_52",
      "improvement_over_parent": null
    },
    "node_54": {
      "node_id": "node_54",
      "content": "INITIAL DESIGN (Trace 8)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 203.29 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.98e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.29343134781004,
      "fos_buckling": 0.9340996876557756,
      "fos_yielding": 1.4496776869844707,
      "deflection": 0.005979199960204252,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_55": {
      "node_id": "node_55",
      "content": "MODIFICATION: Increase 4 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 204.76 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.91e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.76486520602919,
      "fos_buckling": 0.93248298778151,
      "fos_yielding": 1.450323807791588,
      "deflection": 0.005907491319451892,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.425)"
      },
      "parent_node_id": "node_54",
      "improvement_over_parent": null
    },
    "node_56": {
      "node_id": "node_56",
      "content": "MODIFICATION: Increase 5 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 205.48 kg\n  Factor of Safety: 0.94\n  Max Deflection: 5.84e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.47562012257407,
      "fos_buckling": 0.9425819442003874,
      "fos_yielding": 1.4462781154439581,
      "deflection": 0.005841969158200312,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.244)"
      },
      "parent_node_id": "node_55",
      "improvement_over_parent": null
    },
    "node_57": {
      "node_id": "node_57",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 243.56 kg\n  Factor of Safety: 1.10\n  Max Deflection: 4.94e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.56239941312924,
      "fos_buckling": 1.0991624468589436,
      "fos_yielding": 1.7124859096275935,
      "deflection": 0.004937684335421102,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.200)"
      },
      "parent_node_id": "node_56",
      "improvement_over_parent": null
    },
    "node_58": {
      "node_id": "node_58",
      "content": "MODIFICATION: Increase 10 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 254.38 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.38373406474736,
      "fos_buckling": 1.3557958253909395,
      "fos_yielding": 1.7473485025767292,
      "deflection": 0.004647153753143272,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.420)"
      },
      "parent_node_id": "node_57",
      "improvement_over_parent": null
    },
    "node_59": {
      "node_id": "node_59",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.06 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0560103469689,
      "fos_buckling": 1.5222855713109151,
      "fos_yielding": 2.0112338325323047,
      "deflection": 0.004042960710895018,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.167)"
      },
      "parent_node_id": "node_58",
      "improvement_over_parent": null
    },
    "node_60": {
      "node_id": "node_60",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_59",
      "improvement_over_parent": null
    },
    "node_61": {
      "node_id": "node_61",
      "content": "INITIAL DESIGN (Trace 9)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 223.41 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.20e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.40775054292453,
      "fos_buckling": 0.8899758922544191,
      "fos_yielding": 1.7225113846852336,
      "deflection": 0.00619894696406142,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_62": {
      "node_id": "node_62",
      "content": "MODIFICATION: Increase 4 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 224.33 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.19e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.32808934651882,
      "fos_buckling": 0.8898633577363068,
      "fos_yielding": 1.719684293333938,
      "deflection": 0.00618581707185972,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.279)"
      },
      "parent_node_id": "node_61",
      "improvement_over_parent": null
    },
    "node_63": {
      "node_id": "node_63",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n\nPerformance:\n  Mass: 241.90 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.91e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.9039293092823,
      "fos_buckling": 1.2186343055363908,
      "fos_yielding": 1.732144646058062,
      "deflection": 0.004913040341548743,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003299)"
      },
      "parent_node_id": "node_62",
      "improvement_over_parent": null
    },
    "node_64": {
      "node_id": "node_64",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 281.47 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.23e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.47032730845035,
      "fos_buckling": 1.390513422499089,
      "fos_yielding": 2.0125683755832413,
      "deflection": 0.004231345478508354,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.179)"
      },
      "parent_node_id": "node_63",
      "improvement_over_parent": null
    },
    "node_65": {
      "node_id": "node_65",
      "content": "MODIFICATION: Increase 0 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 287.82 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.81684465157053,
      "fos_buckling": 1.4809210493610168,
      "fos_yielding": 2.011301682566931,
      "deflection": 0.004096936702625109,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.252)"
      },
      "parent_node_id": "node_64",
      "improvement_over_parent": null
    },
    "node_66": {
      "node_id": "node_66",
      "content": "MODIFICATION: Increase 2 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0063)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 294.04 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.03667343265585,
      "fos_buckling": 1.478537164105602,
      "fos_yielding": 1.9976967186367702,
      "deflection": 0.004054130066724509,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.289)"
      },
      "parent_node_id": "node_65",
      "improvement_over_parent": null
    },
    "node_67": {
      "node_id": "node_67",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_66",
      "improvement_over_parent": null
    },
    "node_68": {
      "node_id": "node_68",
      "content": "INITIAL DESIGN (Trace 10)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_69": {
      "node_id": "node_69",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 151.25 kg\n  Factor of Safety: 0.71\n  Max Deflection: 6.65e+11 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.2541339016036,
      "fos_buckling": 0.7097175341733507,
      "fos_yielding": 1.4945842469434918,
      "deflection": 665158147348.3713,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003314)"
      },
      "parent_node_id": "node_68",
      "improvement_over_parent": null
    },
    "node_70": {
      "node_id": "node_70",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n\nPerformance:\n  Mass: 167.24 kg\n  Factor of Safety: 0.71\n  Max Deflection: 8.94e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 167.24025282115076,
      "fos_buckling": 0.7057249423449713,
      "fos_yielding": 1.4931062724926336,
      "deflection": 0.00894252999068727,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003086)"
      },
      "parent_node_id": "node_69",
      "improvement_over_parent": null
    },
    "node_71": {
      "node_id": "node_71",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 216.21 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.93e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.20555424381678,
      "fos_buckling": 0.8798456548360469,
      "fos_yielding": 1.9264824860165355,
      "deflection": 0.006930105110189704,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.316)"
      },
      "parent_node_id": "node_70",
      "improvement_over_parent": null
    },
    "node_72": {
      "node_id": "node_72",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 220.62 kg\n  Factor of Safety: 0.88\n  Max Deflection: 5.89e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.62364302298596,
      "fos_buckling": 0.8793114509246704,
      "fos_yielding": 1.695477890103305,
      "deflection": 0.005893424594330066,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002760)"
      },
      "parent_node_id": "node_71",
      "improvement_over_parent": null
    },
    "node_73": {
      "node_id": "node_73",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 248.50 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.76e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.50176211779817,
      "fos_buckling": 1.329537960785395,
      "fos_yielding": 1.707258226910486,
      "deflection": 0.004755552253806458,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004492)"
      },
      "parent_node_id": "node_72",
      "improvement_over_parent": null
    },
    "node_74": {
      "node_id": "node_74",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2970612509265,
      "fos_buckling": 1.5232600447013116,
      "fos_yielding": 2.0129766609264403,
      "deflection": 0.004039715951307516,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.198)"
      },
      "parent_node_id": "node_73",
      "improvement_over_parent": null
    },
    "node_75": {
      "node_id": "node_75",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_74",
      "improvement_over_parent": null
    },
    "node_76": {
      "node_id": "node_76",
      "content": "INITIAL DESIGN (Trace 11)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0017)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 122.89 kg\n  Factor of Safety: 0.56\n  Max Deflection: 1.32e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 122.89478506274456,
      "fos_buckling": 0.561065328142309,
      "fos_yielding": 1.1531786030525737,
      "deflection": 0.013178304976805109,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_77": {
      "node_id": "node_77",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0017)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n\nPerformance:\n  Mass: 125.52 kg\n  Factor of Safety: 0.59\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 125.52065497242853,
      "fos_buckling": 0.5936832192934945,
      "fos_yielding": 1.1531786030525737,
      "deflection": 0.011106077810927874,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001590)"
      },
      "parent_node_id": "node_76",
      "improvement_over_parent": null
    },
    "node_78": {
      "node_id": "node_78",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0017)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n\nPerformance:\n  Mass: 141.12 kg\n  Factor of Safety: 0.80\n  Max Deflection: 8.59e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.11964824275304,
      "fos_buckling": 0.7971929601502072,
      "fos_yielding": 0.9909362097814262,
      "deflection": 0.00859409448095861,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002511)"
      },
      "parent_node_id": "node_77",
      "improvement_over_parent": null
    },
    "node_79": {
      "node_id": "node_79",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 181.49 kg\n  Factor of Safety: 1.00\n  Max Deflection: 6.69e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.49286965518297,
      "fos_buckling": 0.9993619526987536,
      "fos_yielding": 1.273099501897836,
      "deflection": 0.0066946887657739935,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.302)"
      },
      "parent_node_id": "node_78",
      "improvement_over_parent": null
    },
    "node_80": {
      "node_id": "node_80",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 233.99 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.20e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.99106642191762,
      "fos_buckling": 1.2453703506387812,
      "fos_yielding": 1.6391052740828183,
      "deflection": 0.005204947335608282,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.311)"
      },
      "parent_node_id": "node_79",
      "improvement_over_parent": null
    },
    "node_81": {
      "node_id": "node_81",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 281.00 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.34e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.0044108596053,
      "fos_buckling": 1.4496940394799827,
      "fos_yielding": 1.9660033581001162,
      "deflection": 0.004343127783710312,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.220)"
      },
      "parent_node_id": "node_80",
      "improvement_over_parent": null
    },
    "node_82": {
      "node_id": "node_82",
      "content": "MODIFICATION: Increase 1 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.56 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.5588967322291,
      "fos_buckling": 1.524096081167371,
      "fos_yielding": 2.0146049319690515,
      "deflection": 0.004036116466028478,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.610)"
      },
      "parent_node_id": "node_81",
      "improvement_over_parent": null
    },
    "node_83": {
      "node_id": "node_83",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_82",
      "improvement_over_parent": null
    },
    "node_84": {
      "node_id": "node_84",
      "content": "INITIAL DESIGN (Trace 12)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 224.03 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.26e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.0341957314371,
      "fos_buckling": 1.2186168690013242,
      "fos_yielding": 1.6626551890955084,
      "deflection": 0.005264228174600299,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_85": {
      "node_id": "node_85",
      "content": "MODIFICATION: Increase 9 thickness by 51%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 232.14 kg\n  Factor of Safety: 1.28\n  Max Deflection: 5.15e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.14137617570194,
      "fos_buckling": 1.2801210458406846,
      "fos_yielding": 1.6379522955466195,
      "deflection": 0.0051455983938207325,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.511)"
      },
      "parent_node_id": "node_84",
      "improvement_over_parent": null
    },
    "node_86": {
      "node_id": "node_86",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 285.75 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.19e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 285.7523221148142,
      "fos_buckling": 1.519119476585637,
      "fos_yielding": 2.012900559315863,
      "deflection": 0.004192037162754275,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.253)"
      },
      "parent_node_id": "node_85",
      "improvement_over_parent": null
    },
    "node_87": {
      "node_id": "node_87",
      "content": "MODIFICATION: Increase 0 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.04 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0386530047273,
      "fos_buckling": 1.5221582177011486,
      "fos_yielding": 2.0113686828202595,
      "deflection": 0.004043237710381222,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.300)"
      },
      "parent_node_id": "node_86",
      "improvement_over_parent": null
    },
    "node_88": {
      "node_id": "node_88",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_87",
      "improvement_over_parent": null
    },
    "node_89": {
      "node_id": "node_89",
      "content": "INITIAL DESIGN (Trace 13)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 151.45 kg\n  Factor of Safety: 0.66\n  Max Deflection: 8.49e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.451279226155,
      "fos_buckling": 0.6607236795893737,
      "fos_yielding": 1.0530975599631922,
      "deflection": 0.008491617627924348,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_90": {
      "node_id": "node_90",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n\nPerformance:\n  Mass: 165.28 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.15e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.28213764744174,
      "fos_buckling": 0.8345119356283633,
      "fos_yielding": 0.9343569372871473,
      "deflection": 0.007149435185004823,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002649)"
      },
      "parent_node_id": "node_89",
      "improvement_over_parent": null
    },
    "node_91": {
      "node_id": "node_91",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n\nPerformance:\n  Mass: 189.04 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.26e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.03645138388742,
      "fos_buckling": 0.9447757808168176,
      "fos_yielding": 1.06956396746078,
      "deflection": 0.00625940845619006,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.152)"
      },
      "parent_node_id": "node_90",
      "improvement_over_parent": null
    },
    "node_92": {
      "node_id": "node_92",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n\nPerformance:\n  Mass: 234.09 kg\n  Factor of Safety: 1.15\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.09470576455828,
      "fos_buckling": 1.1472041412830059,
      "fos_yielding": 1.3268205482179727,
      "deflection": 0.005067410337175561,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.256)"
      },
      "parent_node_id": "node_91",
      "improvement_over_parent": null
    },
    "node_93": {
      "node_id": "node_93",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 291.06 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.0626632114739,
      "fos_buckling": 1.3904728381009086,
      "fos_yielding": 1.6537493413798174,
      "deflection": 0.00408858853122434,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.267)"
      },
      "parent_node_id": "node_92",
      "improvement_over_parent": null
    },
    "node_94": {
      "node_id": "node_94",
      "content": "MODIFICATION: Increase 6 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0077)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 300.44 kg\n  Factor of Safety: 1.39\n  Max Deflection: 3.97e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 300.4385639545067,
      "fos_buckling": 1.3895774249412467,
      "fos_yielding": 1.65268438787445,
      "deflection": 0.003966808734515686,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.245)"
      },
      "parent_node_id": "node_93",
      "improvement_over_parent": null
    },
    "node_95": {
      "node_id": "node_95",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_94",
      "improvement_over_parent": null
    },
    "node_96": {
      "node_id": "node_96",
      "content": "INITIAL DESIGN (Trace 14)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 205.15 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.97e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.14519841817608,
      "fos_buckling": 0.4794080026584339,
      "fos_yielding": 1.417506173529555,
      "deflection": 0.008972218313064604,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_97": {
      "node_id": "node_97",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 245.28 kg\n  Factor of Safety: 0.94\n  Max Deflection: 5.05e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.28040513213722,
      "fos_buckling": 0.9369857277589196,
      "fos_yielding": 1.8175192116269014,
      "deflection": 0.005050116981470743,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005585)"
      },
      "parent_node_id": "node_96",
      "improvement_over_parent": null
    },
    "node_98": {
      "node_id": "node_98",
      "content": "MODIFICATION: Increase 7 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 255.55 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.67e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.55006726672417,
      "fos_buckling": 1.201934454153588,
      "fos_yielding": 1.8145572351788801,
      "deflection": 0.0046724307491261986,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.541)"
      },
      "parent_node_id": "node_97",
      "improvement_over_parent": null
    },
    "node_99": {
      "node_id": "node_99",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 283.77 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.21e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.77106729366983,
      "fos_buckling": 1.3162798262200217,
      "fos_yielding": 2.013048537413046,
      "deflection": 0.004214011617190023,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.121)"
      },
      "parent_node_id": "node_98",
      "improvement_over_parent": null
    },
    "node_100": {
      "node_id": "node_100",
      "content": "MODIFICATION: Increase 7 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.09 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0925806279292,
      "fos_buckling": 1.5221785718016676,
      "fos_yielding": 2.0113058849777,
      "deflection": 0.004042447112100391,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.302)"
      },
      "parent_node_id": "node_99",
      "improvement_over_parent": null
    },
    "node_101": {
      "node_id": "node_101",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_100",
      "improvement_over_parent": null
    },
    "node_102": {
      "node_id": "node_102",
      "content": "INITIAL DESIGN (Trace 15)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0017)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0018)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0015)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0015)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0012)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0005)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0014)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0019)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0016)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0016)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0019)]\n\nPerformance:\n  Mass: 93.77 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.28e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 93.77132739703598,
      "fos_buckling": 0.4000655737340699,
      "fos_yielding": 0.6578647219686984,
      "deflection": 0.01282627804030336,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_103": {
      "node_id": "node_103",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0022)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0022)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0007)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0024)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0021)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n\nPerformance:\n  Mass: 117.63 kg\n  Factor of Safety: 0.50\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 117.62960997363012,
      "fos_buckling": 0.49973059303008915,
      "fos_yielding": 0.824715418471461,
      "deflection": 0.010236376308418489,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.263)"
      },
      "parent_node_id": "node_102",
      "improvement_over_parent": null
    },
    "node_104": {
      "node_id": "node_104",
      "content": "MODIFICATION: Increase 5 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0022)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0022)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0009)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0024)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0021)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n\nPerformance:\n  Mass: 117.99 kg\n  Factor of Safety: 0.62\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 117.98669149880735,
      "fos_buckling": 0.6193035949579243,
      "fos_yielding": 0.8207679051062697,
      "deflection": 0.010061916987659144,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.312)"
      },
      "parent_node_id": "node_103",
      "improvement_over_parent": null
    },
    "node_105": {
      "node_id": "node_105",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 149.30 kg\n  Factor of Safety: 0.78\n  Max Deflection: 7.96e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.2986472245325,
      "fos_buckling": 0.7759965722534998,
      "fos_yielding": 1.0377660457798266,
      "deflection": 0.007964854417424588,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.277)"
      },
      "parent_node_id": "node_104",
      "improvement_over_parent": null
    },
    "node_106": {
      "node_id": "node_106",
      "content": "MODIFICATION: Increase 5 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 150.03 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.83e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 150.0289389915896,
      "fos_buckling": 0.8547446712060867,
      "fos_yielding": 1.0329731795173136,
      "deflection": 0.007831707417166135,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.393)"
      },
      "parent_node_id": "node_105",
      "improvement_over_parent": null
    },
    "node_107": {
      "node_id": "node_107",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 195.07 kg\n  Factor of Safety: 1.08\n  Max Deflection: 6.04e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.06726901326277,
      "fos_buckling": 1.0802731325009667,
      "fos_yielding": 1.3417043247573288,
      "deflection": 0.006039319658346207,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.318)"
      },
      "parent_node_id": "node_106",
      "improvement_over_parent": null
    },
    "node_108": {
      "node_id": "node_108",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 234.65 kg\n  Factor of Safety: 1.27\n  Max Deflection: 5.03e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.65262467932806,
      "fos_buckling": 1.26680916412431,
      "fos_yielding": 1.612538469721764,
      "deflection": 0.00503207764677902,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.218)"
      },
      "parent_node_id": "node_107",
      "improvement_over_parent": null
    },
    "node_109": {
      "node_id": "node_109",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.21 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.21478592728556,
      "fos_buckling": 1.5228786384655686,
      "fos_yielding": 2.012322364750001,
      "deflection": 0.004040755374483925,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.274)"
      },
      "parent_node_id": "node_108",
      "improvement_over_parent": null
    },
    "node_110": {
      "node_id": "node_110",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_109",
      "improvement_over_parent": null
    },
    "node_111": {
      "node_id": "node_111",
      "content": "INITIAL DESIGN (Trace 16)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n\nPerformance:\n  Mass: 108.82 kg\n  Factor of Safety: 0.84\n  Max Deflection: 1.35e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 108.82443223701566,
      "fos_buckling": 0.8375850828061925,
      "fos_yielding": 1.3657049744754917,
      "deflection": 13492784995774.537,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_112": {
      "node_id": "node_112",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 135.41 kg\n  Factor of Safety: 0.65\n  Max Deflection: 9.86e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 135.41179823437824,
      "fos_buckling": 0.649630493124381,
      "fos_yielding": 1.3657049744754917,
      "deflection": 0.009864572361188446,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003597)"
      },
      "parent_node_id": "node_111",
      "improvement_over_parent": null
    },
    "node_113": {
      "node_id": "node_113",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n\nPerformance:\n  Mass: 155.04 kg\n  Factor of Safety: 0.69\n  Max Deflection: 8.20e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.03622446136504,
      "fos_buckling": 0.6910220074496468,
      "fos_yielding": 1.1949600107994933,
      "deflection": 0.008196856768614204,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003090)"
      },
      "parent_node_id": "node_112",
      "improvement_over_parent": null
    },
    "node_114": {
      "node_id": "node_114",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n\nPerformance:\n  Mass: 180.14 kg\n  Factor of Safety: 0.79\n  Max Deflection: 7.07e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.14198807211835,
      "fos_buckling": 0.7885334333188151,
      "fos_yielding": 1.3905862489555894,
      "deflection": 0.007065256009904234,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.172)"
      },
      "parent_node_id": "node_113",
      "improvement_over_parent": null
    },
    "node_115": {
      "node_id": "node_115",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 209.98 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.07e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.97770255866223,
      "fos_buckling": 0.8992758513179474,
      "fos_yielding": 1.6240440080867735,
      "deflection": 0.006072313243079995,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.178)"
      },
      "parent_node_id": "node_114",
      "improvement_over_parent": null
    },
    "node_116": {
      "node_id": "node_116",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 259.93 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.92e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.92564532334285,
      "fos_buckling": 1.0722634126690216,
      "fos_yielding": 2.017561391352949,
      "deflection": 0.004920224791827658,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.261)"
      },
      "parent_node_id": "node_115",
      "improvement_over_parent": null
    },
    "node_117": {
      "node_id": "node_117",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 290.90 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.90419137241923,
      "fos_buckling": 1.242025947672722,
      "fos_yielding": 2.010653459775785,
      "deflection": 0.004105084544288029,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_116",
      "improvement_over_parent": null
    },
    "node_118": {
      "node_id": "node_118",
      "content": "MODIFICATION: Increase 4 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.12 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1167214818651,
      "fos_buckling": 1.5224741301788691,
      "fos_yielding": 2.011602652706307,
      "deflection": 0.0040422113897888535,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.502)"
      },
      "parent_node_id": "node_117",
      "improvement_over_parent": null
    },
    "node_119": {
      "node_id": "node_119",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_118",
      "improvement_over_parent": null
    },
    "node_120": {
      "node_id": "node_120",
      "content": "INITIAL DESIGN (Trace 17)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 163.75 kg\n  Factor of Safety: 0.82\n  Max Deflection: 7.14e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 163.74514533863658,
      "fos_buckling": 0.8173782166829472,
      "fos_yielding": 1.2504752671095116,
      "deflection": 0.007136691309488537,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_121": {
      "node_id": "node_121",
      "content": "MODIFICATION: Increase 9 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 168.56 kg\n  Factor of Safety: 0.82\n  Max Deflection: 7.03e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.55809189843959,
      "fos_buckling": 0.8155646812852084,
      "fos_yielding": 1.2381762145640325,
      "deflection": 0.007032476746489785,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.361)"
      },
      "parent_node_id": "node_120",
      "improvement_over_parent": null
    },
    "node_122": {
      "node_id": "node_122",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 214.35 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.54e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.35430362591103,
      "fos_buckling": 1.0157934479993482,
      "fos_yielding": 1.571670521035837,
      "deflection": 0.0055435391661023785,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.290)"
      },
      "parent_node_id": "node_121",
      "improvement_over_parent": null
    },
    "node_123": {
      "node_id": "node_123",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 277.34 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.30e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 277.3417520665293,
      "fos_buckling": 1.276252578439046,
      "fos_yielding": 2.028155029847073,
      "deflection": 0.004298845157848188,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.321)"
      },
      "parent_node_id": "node_122",
      "improvement_over_parent": null
    },
    "node_124": {
      "node_id": "node_124",
      "content": "MODIFICATION: Increase 7 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.43 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.43154796589715,
      "fos_buckling": 1.4871972512095304,
      "fos_yielding": 2.0261018099939996,
      "deflection": 0.004087126127328113,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.379)"
      },
      "parent_node_id": "node_123",
      "improvement_over_parent": null
    },
    "node_125": {
      "node_id": "node_125",
      "content": "MODIFICATION: Increase 3 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.15780338643197,
      "fos_buckling": 1.5225619849069745,
      "fos_yielding": 2.011784283029331,
      "deflection": 0.00404164002661972,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.264)"
      },
      "parent_node_id": "node_124",
      "improvement_over_parent": null
    },
    "node_126": {
      "node_id": "node_126",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_125",
      "improvement_over_parent": null
    },
    "node_127": {
      "node_id": "node_127",
      "content": "INITIAL DESIGN (Trace 18)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 219.43 kg\n  Factor of Safety: 0.77\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.42793524680255,
      "fos_buckling": 0.7663563008311606,
      "fos_yielding": 1.9744564264096676,
      "deflection": 0.007189550573022147,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_128": {
      "node_id": "node_128",
      "content": "MODIFICATION: Increase 5 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 226.03 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.80e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.03234631562214,
      "fos_buckling": 0.9066601736474879,
      "fos_yielding": 1.9744564264096671,
      "deflection": 0.006796448064661958,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.233)"
      },
      "parent_node_id": "node_127",
      "improvement_over_parent": null
    },
    "node_129": {
      "node_id": "node_129",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n\nPerformance:\n  Mass: 228.87 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.70e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.86792763812218,
      "fos_buckling": 0.950583052395713,
      "fos_yielding": 1.9392500450244985,
      "deflection": 0.005697586375090684,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001723)"
      },
      "parent_node_id": "node_128",
      "improvement_over_parent": null
    },
    "node_130": {
      "node_id": "node_130",
      "content": "MODIFICATION: Increase 4 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0064)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n\nPerformance:\n  Mass: 233.64 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.70e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.6408501436077,
      "fos_buckling": 0.950583052395713,
      "fos_yielding": 1.9392500450244985,
      "deflection": 0.005697586375090684,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.634)"
      },
      "parent_node_id": "node_129",
      "improvement_over_parent": null
    },
    "node_131": {
      "node_id": "node_131",
      "content": "MODIFICATION: Increase 3 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0064)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n\nPerformance:\n  Mass: 235.10 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.65e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.09641088741654,
      "fos_buckling": 0.950583052395713,
      "fos_yielding": 2.5180277926147907,
      "deflection": 0.005646129720520437,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.340)"
      },
      "parent_node_id": "node_130",
      "improvement_over_parent": null
    },
    "node_132": {
      "node_id": "node_132",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0075)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n\nPerformance:\n  Mass: 272.41 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.88e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 272.4138762290639,
      "fos_buckling": 1.0727798543639468,
      "fos_yielding": 2.9132635943642287,
      "deflection": 0.0048807752761134745,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.175)"
      },
      "parent_node_id": "node_131",
      "improvement_over_parent": null
    },
    "node_133": {
      "node_id": "node_133",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0075)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 296.80 kg\n  Factor of Safety: 1.25\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 296.795348189896,
      "fos_buckling": 1.2478060464552365,
      "fos_yielding": 2.74923521685827,
      "deflection": 0.0040768307994932815,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_132",
      "improvement_over_parent": null
    },
    "node_134": {
      "node_id": "node_134",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_133",
      "improvement_over_parent": null
    },
    "node_135": {
      "node_id": "node_135",
      "content": "INITIAL DESIGN (Trace 19)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 142.64 kg\n  Factor of Safety: 0.61\n  Max Deflection: 9.01e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 142.63778845337117,
      "fos_buckling": 0.6099320464668089,
      "fos_yielding": 1.1218534778464144,
      "deflection": 0.009008903033155206,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_136": {
      "node_id": "node_136",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 171.99 kg\n  Factor of Safety: 0.72\n  Max Deflection: 7.49e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.99431363232083,
      "fos_buckling": 0.7199155735965952,
      "fos_yielding": 1.351541732544812,
      "deflection": 0.00748534615246881,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.218)"
      },
      "parent_node_id": "node_135",
      "improvement_over_parent": null
    },
    "node_137": {
      "node_id": "node_137",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 211.17 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.17010844435782,
      "fos_buckling": 0.8585422660273483,
      "fos_yielding": 1.6573966207243258,
      "deflection": 0.0061120451202136454,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.245)"
      },
      "parent_node_id": "node_136",
      "improvement_over_parent": null
    },
    "node_138": {
      "node_id": "node_138",
      "content": "MODIFICATION: Increase 3 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 214.35 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.06e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.3521902903795,
      "fos_buckling": 0.8583544693670256,
      "fos_yielding": 1.647751703061537,
      "deflection": 0.00606317965408761,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.203)"
      },
      "parent_node_id": "node_137",
      "improvement_over_parent": null
    },
    "node_139": {
      "node_id": "node_139",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.23 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.22531740715624,
      "fos_buckling": 1.0069221012613885,
      "fos_yielding": 1.9981620655152592,
      "deflection": 0.005008578398280139,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.235)"
      },
      "parent_node_id": "node_138",
      "improvement_over_parent": null
    },
    "node_140": {
      "node_id": "node_140",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.13785403877324,
      "fos_buckling": 1.522422325843243,
      "fos_yielding": 2.0119469296693753,
      "deflection": 0.004041852189647476,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_139",
      "improvement_over_parent": null
    },
    "node_141": {
      "node_id": "node_141",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_140",
      "improvement_over_parent": null
    },
    "node_142": {
      "node_id": "node_142",
      "content": "INITIAL DESIGN (Trace 20)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 142.38 kg\n  Factor of Safety: 0.64\n  Max Deflection: 1.00e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 142.38306485979248,
      "fos_buckling": 0.6392691098632203,
      "fos_yielding": 1.3418396451711871,
      "deflection": 0.010049065839338418,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_143": {
      "node_id": "node_143",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 163.20 kg\n  Factor of Safety: 0.72\n  Max Deflection: 8.78e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 163.195986927716,
      "fos_buckling": 0.7211950489389918,
      "fos_yielding": 1.537648365050212,
      "deflection": 0.008781458392804488,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.155)"
      },
      "parent_node_id": "node_142",
      "improvement_over_parent": null
    },
    "node_144": {
      "node_id": "node_144",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 212.65 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.76e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.64607132497918,
      "fos_buckling": 0.9042255467876102,
      "fos_yielding": 2.002534186317215,
      "deflection": 0.0067648585244129075,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.328)"
      },
      "parent_node_id": "node_143",
      "improvement_over_parent": null
    },
    "node_145": {
      "node_id": "node_145",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n\nPerformance:\n  Mass: 226.06 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.84e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.05854475888137,
      "fos_buckling": 0.9033925000264181,
      "fos_yielding": 1.7800398653490421,
      "deflection": 0.005842769442999578,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002565)"
      },
      "parent_node_id": "node_144",
      "improvement_over_parent": null
    },
    "node_146": {
      "node_id": "node_146",
      "content": "MODIFICATION: Increase 2 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0054)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n\nPerformance:\n  Mass: 229.50 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.84e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.49870526472557,
      "fos_buckling": 0.9033925000264181,
      "fos_yielding": 1.7800398653490421,
      "deflection": 0.005842769442999578,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.639)"
      },
      "parent_node_id": "node_145",
      "improvement_over_parent": null
    },
    "node_147": {
      "node_id": "node_147",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0063)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n\nPerformance:\n  Mass: 262.27 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.12e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.2719327119413,
      "fos_buckling": 1.0075692811948427,
      "fos_yielding": 2.032567803623832,
      "deflection": 0.00512112570594803,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.157)"
      },
      "parent_node_id": "node_146",
      "improvement_over_parent": null
    },
    "node_148": {
      "node_id": "node_148",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0063)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 288.17 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.1693698543311,
      "fos_buckling": 1.357072126362809,
      "fos_yielding": 2.0460525730164196,
      "deflection": 0.004091387768235685,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_147",
      "improvement_over_parent": null
    },
    "node_149": {
      "node_id": "node_149",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_148",
      "improvement_over_parent": null
    },
    "node_150": {
      "node_id": "node_150",
      "content": "INITIAL DESIGN (Trace 21)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 166.66 kg\n  Factor of Safety: 0.31\n  Max Deflection: 2.96e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.66395384212726,
      "fos_buckling": 0.3103524747091269,
      "fos_yielding": 1.3202064107867377,
      "deflection": 0.029554241955667703,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_151": {
      "node_id": "node_151",
      "content": "MODIFICATION: Increase 6 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 174.06 kg\n  Factor of Safety: 0.31\n  Max Deflection: 2.84e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.06363690708505,
      "fos_buckling": 0.31019415964770364,
      "fos_yielding": 1.3202064107867377,
      "deflection": 0.02843739005234648,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.439)"
      },
      "parent_node_id": "node_150",
      "improvement_over_parent": null
    },
    "node_152": {
      "node_id": "node_152",
      "content": "MODIFICATION: Increase 2 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 181.68 kg\n  Factor of Safety: 0.38\n  Max Deflection: 2.70e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.67542880666724,
      "fos_buckling": 0.37777636844168966,
      "fos_yielding": 1.3195090781259449,
      "deflection": 0.02701136607430207,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.656)"
      },
      "parent_node_id": "node_151",
      "improvement_over_parent": null
    },
    "node_153": {
      "node_id": "node_153",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 185.70 kg\n  Factor of Safety: 0.48\n  Max Deflection: 9.55e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.70400253958567,
      "fos_buckling": 0.47558700240997276,
      "fos_yielding": 1.114989174211693,
      "deflection": 0.00954899536093181,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002499)"
      },
      "parent_node_id": "node_152",
      "improvement_over_parent": null
    },
    "node_154": {
      "node_id": "node_154",
      "content": "MODIFICATION: Increase 9 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n\nPerformance:\n  Mass: 186.42 kg\n  Factor of Safety: 0.48\n  Max Deflection: 9.41e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.419166620215,
      "fos_buckling": 0.47554016337550903,
      "fos_yielding": 1.110625596149401,
      "deflection": 0.009413700243684712,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.193)"
      },
      "parent_node_id": "node_153",
      "improvement_over_parent": null
    },
    "node_155": {
      "node_id": "node_155",
      "content": "MODIFICATION: Increase 6 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0059)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n\nPerformance:\n  Mass: 196.69 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.63e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.68586864567482,
      "fos_buckling": 0.4752042297147267,
      "fos_yielding": 1.1104864160881616,
      "deflection": 0.008634009281005764,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.447)"
      },
      "parent_node_id": "node_154",
      "improvement_over_parent": null
    },
    "node_156": {
      "node_id": "node_156",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0059)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n\nPerformance:\n  Mass: 230.07 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.33e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.0663680049105,
      "fos_buckling": 0.967021250146522,
      "fos_yielding": 1.0980143828548858,
      "deflection": 0.005331198646204902,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004662)"
      },
      "parent_node_id": "node_155",
      "improvement_over_parent": null
    },
    "node_157": {
      "node_id": "node_157",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0078)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0039)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 297.43 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 297.4270241545186,
      "fos_buckling": 1.224001839678317,
      "fos_yielding": 1.4291850442152358,
      "deflection": 0.004133470782242649,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.323)"
      },
      "parent_node_id": "node_156",
      "improvement_over_parent": null
    },
    "node_158": {
      "node_id": "node_158",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_157",
      "improvement_over_parent": null
    },
    "node_159": {
      "node_id": "node_159",
      "content": "INITIAL DESIGN (Trace 22)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 218.50 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.99e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.49613401783438,
      "fos_buckling": 0.9085560026904204,
      "fos_yielding": 1.761683395632703,
      "deflection": 0.005994028424174523,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_160": {
      "node_id": "node_160",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 248.25 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.28e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.25473146995924,
      "fos_buckling": 1.0080499893348907,
      "fos_yielding": 1.9991139443147128,
      "deflection": 0.0052841953674542625,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.149)"
      },
      "parent_node_id": "node_159",
      "improvement_over_parent": null
    },
    "node_161": {
      "node_id": "node_161",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 281.17 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.23e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.16726810157627,
      "fos_buckling": 1.3626535921603233,
      "fos_yielding": 2.012802811186604,
      "deflection": 0.004229803713960715,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_160",
      "improvement_over_parent": null
    },
    "node_162": {
      "node_id": "node_162",
      "content": "MODIFICATION: Increase 0 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 286.88 kg\n  Factor of Safety: 1.46\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.8817752209701,
      "fos_buckling": 1.4588035136692625,
      "fos_yielding": 2.0116851167759595,
      "deflection": 0.004109095992735484,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.222)"
      },
      "parent_node_id": "node_161",
      "improvement_over_parent": null
    },
    "node_163": {
      "node_id": "node_163",
      "content": "MODIFICATION: Increase 2 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.27022472023015,
      "fos_buckling": 1.5229892653058839,
      "fos_yielding": 2.01262616856252,
      "deflection": 0.004040181464073676,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.359)"
      },
      "parent_node_id": "node_162",
      "improvement_over_parent": null
    },
    "node_164": {
      "node_id": "node_164",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_163",
      "improvement_over_parent": null
    },
    "node_165": {
      "node_id": "node_165",
      "content": "INITIAL DESIGN (Trace 23)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 149.26 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.19e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.2634603081113,
      "fos_buckling": 0.3910826926165104,
      "fos_yielding": 1.1802323834117785,
      "deflection": 0.011902764679585797,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_166": {
      "node_id": "node_166",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 168.95 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.05e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.95130303370377,
      "fos_buckling": 0.4359380340679233,
      "fos_yielding": 1.3341828506915585,
      "deflection": 0.010527817910982657,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.140)"
      },
      "parent_node_id": "node_165",
      "improvement_over_parent": null
    },
    "node_167": {
      "node_id": "node_167",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 200.07 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.91e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.0683748487513,
      "fos_buckling": 0.503683534008041,
      "fos_yielding": 1.576675376921403,
      "deflection": 0.008906537762136865,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.198)"
      },
      "parent_node_id": "node_166",
      "improvement_over_parent": null
    },
    "node_168": {
      "node_id": "node_168",
      "content": "MODIFICATION: Increase 1 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 206.91 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.67e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.91096116099334,
      "fos_buckling": 0.503446496824321,
      "fos_yielding": 1.5762806592813168,
      "deflection": 0.008671941844376625,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.332)"
      },
      "parent_node_id": "node_167",
      "improvement_over_parent": null
    },
    "node_169": {
      "node_id": "node_169",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 242.68 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.87e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.67580761578563,
      "fos_buckling": 1.3028862596177897,
      "fos_yielding": 1.6671675441623717,
      "deflection": 0.004867916958736392,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005021)"
      },
      "parent_node_id": "node_168",
      "improvement_over_parent": null
    },
    "node_170": {
      "node_id": "node_170",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.28 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.27956262269964,
      "fos_buckling": 1.5226945786443915,
      "fos_yielding": 2.0125218350164062,
      "deflection": 0.0040398264967009545,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.229)"
      },
      "parent_node_id": "node_169",
      "improvement_over_parent": null
    },
    "node_171": {
      "node_id": "node_171",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_170",
      "improvement_over_parent": null
    },
    "node_172": {
      "node_id": "node_172",
      "content": "INITIAL DESIGN (Trace 24)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 209.82 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.61e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.81590468390226,
      "fos_buckling": 1.1282513316493652,
      "fos_yielding": 1.5873647759824645,
      "deflection": 0.005605177178539316,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_173": {
      "node_id": "node_173",
      "content": "MODIFICATION: Increase 7 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 214.81 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.47e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.80567275127135,
      "fos_buckling": 1.2124690530668683,
      "fos_yielding": 1.5866201279794605,
      "deflection": 0.0054656654521036095,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.186)"
      },
      "parent_node_id": "node_172",
      "improvement_over_parent": null
    },
    "node_174": {
      "node_id": "node_174",
      "content": "MODIFICATION: Increase 8 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 219.84 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.38e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.84029504376116,
      "fos_buckling": 1.2102349798544962,
      "fos_yielding": 1.587246917150895,
      "deflection": 0.005375941359529518,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.261)"
      },
      "parent_node_id": "node_173",
      "improvement_over_parent": null
    },
    "node_175": {
      "node_id": "node_175",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 281.56 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.21e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.555381070362,
      "fos_buckling": 1.4855595851369106,
      "fos_yielding": 2.0281196034534403,
      "deflection": 0.004212205066973544,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.307)"
      },
      "parent_node_id": "node_174",
      "improvement_over_parent": null
    },
    "node_176": {
      "node_id": "node_176",
      "content": "MODIFICATION: Increase 9 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 286.82 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.17e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 286.82086675646394,
      "fos_buckling": 1.5202649564935837,
      "fos_yielding": 2.0139022108563718,
      "deflection": 0.004167625824431575,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.225)"
      },
      "parent_node_id": "node_175",
      "improvement_over_parent": null
    },
    "node_177": {
      "node_id": "node_177",
      "content": "MODIFICATION: Increase 0 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22819402243056,
      "fos_buckling": 1.5228512678880053,
      "fos_yielding": 2.01258711731047,
      "deflection": 0.004040469372366093,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.255)"
      },
      "parent_node_id": "node_176",
      "improvement_over_parent": null
    },
    "node_178": {
      "node_id": "node_178",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_177",
      "improvement_over_parent": null
    },
    "node_179": {
      "node_id": "node_179",
      "content": "INITIAL DESIGN (Trace 25)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 181.44 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.57e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.44052074307686,
      "fos_buckling": 0.8359462818032478,
      "fos_yielding": 1.4228671412835467,
      "deflection": 0.006565327546636612,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_180": {
      "node_id": "node_180",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 214.54 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.56e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.53930395011037,
      "fos_buckling": 0.9745096191254187,
      "fos_yielding": 1.6791535176997103,
      "deflection": 0.005561060461978398,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.195)"
      },
      "parent_node_id": "node_179",
      "improvement_over_parent": null
    },
    "node_181": {
      "node_id": "node_181",
      "content": "MODIFICATION: Increase 5 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 215.73 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.48e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.72649722051614,
      "fos_buckling": 0.9907397358736072,
      "fos_yielding": 1.6720503331234577,
      "deflection": 0.0054772881953477435,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.416)"
      },
      "parent_node_id": "node_180",
      "improvement_over_parent": null
    },
    "node_182": {
      "node_id": "node_182",
      "content": "MODIFICATION: Increase 2 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 219.93 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.39e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.92819606165776,
      "fos_buckling": 1.024289030875813,
      "fos_yielding": 1.6726400377855228,
      "deflection": 0.005388757163564238,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.267)"
      },
      "parent_node_id": "node_181",
      "improvement_over_parent": null
    },
    "node_183": {
      "node_id": "node_183",
      "content": "MODIFICATION: Increase 7 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 230.79 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.06e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.79456108663126,
      "fos_buckling": 1.2221354706790237,
      "fos_yielding": 1.670696557895354,
      "deflection": 0.005062131400550937,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.479)"
      },
      "parent_node_id": "node_182",
      "improvement_over_parent": null
    },
    "node_184": {
      "node_id": "node_184",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.85 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.8484001358711,
      "fos_buckling": 1.4459842841606643,
      "fos_yielding": 2.0438439797309713,
      "deflection": 0.004143386271547558,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.247)"
      },
      "parent_node_id": "node_183",
      "improvement_over_parent": null
    },
    "node_185": {
      "node_id": "node_185",
      "content": "MODIFICATION: Increase 9 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.15 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.14825350576353,
      "fos_buckling": 1.5225879959726798,
      "fos_yielding": 2.0117074794515215,
      "deflection": 0.004041788930547704,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.546)"
      },
      "parent_node_id": "node_184",
      "improvement_over_parent": null
    },
    "node_186": {
      "node_id": "node_186",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_185",
      "improvement_over_parent": null
    },
    "node_187": {
      "node_id": "node_187",
      "content": "INITIAL DESIGN (Trace 26)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 201.96 kg\n  Factor of Safety: 0.37\n  Max Deflection: 2.60e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.95614126782712,
      "fos_buckling": 0.3669433173154512,
      "fos_yielding": 1.335180382654326,
      "deflection": 25986954488950.027,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_188": {
      "node_id": "node_188",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 207.17 kg\n  Factor of Safety: 0.44\n  Max Deflection: 8.56e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.16997130164123,
      "fos_buckling": 0.442710398472157,
      "fos_yielding": 1.9045450024425534,
      "deflection": 0.008559174048420527,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_187",
      "improvement_over_parent": null
    },
    "node_189": {
      "node_id": "node_189",
      "content": "MODIFICATION: Increase 2 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 214.60 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.83e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.5961516912711,
      "fos_buckling": 0.5898592111335959,
      "fos_yielding": 1.9029942185017548,
      "deflection": 0.007830952094213155,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.441)"
      },
      "parent_node_id": "node_188",
      "improvement_over_parent": null
    },
    "node_190": {
      "node_id": "node_190",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 257.79 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.7942096287233,
      "fos_buckling": 1.0729160506062108,
      "fos_yielding": 2.288705209673079,
      "deflection": 0.004849906424174719,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_189",
      "improvement_over_parent": null
    },
    "node_191": {
      "node_id": "node_191",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 288.77 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.7727556777997,
      "fos_buckling": 1.4898138145409883,
      "fos_yielding": 2.025812399769794,
      "deflection": 0.004083114216807156,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_190",
      "improvement_over_parent": null
    },
    "node_192": {
      "node_id": "node_192",
      "content": "MODIFICATION: Increase 3 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2193650507959,
      "fos_buckling": 1.5228247262743668,
      "fos_yielding": 2.0124647282194474,
      "deflection": 0.004040746203581733,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.245)"
      },
      "parent_node_id": "node_191",
      "improvement_over_parent": null
    },
    "node_193": {
      "node_id": "node_193",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_192",
      "improvement_over_parent": null
    },
    "node_194": {
      "node_id": "node_194",
      "content": "INITIAL DESIGN (Trace 27)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 140.46 kg\n  Factor of Safety: 0.31\n  Max Deflection: 1.31e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 140.46499889364722,
      "fos_buckling": 0.31364115360713873,
      "fos_yielding": 1.0913469535009865,
      "deflection": 0.013092731402582719,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_195": {
      "node_id": "node_195",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 160.79 kg\n  Factor of Safety: 0.35\n  Max Deflection: 1.14e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.78725687181708,
      "fos_buckling": 0.354750626297196,
      "fos_yielding": 1.247749652753582,
      "deflection": 0.011448706061362014,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.153)"
      },
      "parent_node_id": "node_194",
      "improvement_over_parent": null
    },
    "node_196": {
      "node_id": "node_196",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 205.59 kg\n  Factor of Safety: 0.44\n  Max Deflection: 8.97e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.58805255434393,
      "fos_buckling": 0.4415822866023117,
      "fos_yielding": 1.5912042941413835,
      "deflection": 0.00897223531369124,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.300)"
      },
      "parent_node_id": "node_195",
      "improvement_over_parent": null
    },
    "node_197": {
      "node_id": "node_197",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n\nPerformance:\n  Mass: 241.68 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.87e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.67627468661456,
      "fos_buckling": 1.2900526008235755,
      "fos_yielding": 1.6819467108285706,
      "deflection": 0.004870192677451829,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005070)"
      },
      "parent_node_id": "node_196",
      "improvement_over_parent": null
    },
    "node_198": {
      "node_id": "node_198",
      "content": "MODIFICATION: Increase 2 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n\nPerformance:\n  Mass: 244.89 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.82e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.88758743243574,
      "fos_buckling": 1.3131489354652222,
      "fos_yielding": 1.6823847051756635,
      "deflection": 0.004824735066598426,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.188)"
      },
      "parent_node_id": "node_197",
      "improvement_over_parent": null
    },
    "node_199": {
      "node_id": "node_199",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.27336650783656,
      "fos_buckling": 1.522989532262866,
      "fos_yielding": 2.012603868287965,
      "deflection": 0.004040045494760326,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.217)"
      },
      "parent_node_id": "node_198",
      "improvement_over_parent": null
    },
    "node_200": {
      "node_id": "node_200",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_199",
      "improvement_over_parent": null
    },
    "node_201": {
      "node_id": "node_201",
      "content": "INITIAL DESIGN (Trace 28)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 230.35 kg\n  Factor of Safety: 1.19\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.35167800107,
      "fos_buckling": 1.1928341473861177,
      "fos_yielding": 1.6392086325107447,
      "deflection": 0.005144716122396281,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_202": {
      "node_id": "node_202",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 284.21 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.18e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 284.20881273822414,
      "fos_buckling": 1.4346700944146928,
      "fos_yielding": 2.018764118766379,
      "deflection": 0.004182151478130337,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.256)"
      },
      "parent_node_id": "node_201",
      "improvement_over_parent": null
    },
    "node_203": {
      "node_id": "node_203",
      "content": "MODIFICATION: Increase 4 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 285.67 kg\n  Factor of Safety: 1.46\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.6704310031797,
      "fos_buckling": 1.4609293095296796,
      "fos_yielding": 2.019397166944172,
      "deflection": 0.004150043821538257,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.287)"
      },
      "parent_node_id": "node_202",
      "improvement_over_parent": null
    },
    "node_204": {
      "node_id": "node_204",
      "content": "MODIFICATION: Increase 8 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.11 kg\n  Factor of Safety: 1.50\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.1085515520343,
      "fos_buckling": 1.497548231126323,
      "fos_yielding": 2.0203748097142533,
      "deflection": 0.0040932826328507945,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.267)"
      },
      "parent_node_id": "node_203",
      "improvement_over_parent": null
    },
    "node_205": {
      "node_id": "node_205",
      "content": "MODIFICATION: Increase 5 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.30324999989585,
      "fos_buckling": 1.523236766574191,
      "fos_yielding": 2.0129696715054854,
      "deflection": 0.004039554633959978,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.326)"
      },
      "parent_node_id": "node_204",
      "improvement_over_parent": null
    },
    "node_206": {
      "node_id": "node_206",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_205",
      "improvement_over_parent": null
    },
    "node_207": {
      "node_id": "node_207",
      "content": "INITIAL DESIGN (Trace 29)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 173.15 kg\n  Factor of Safety: 0.56\n  Max Deflection: 8.18e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.15178237424396,
      "fos_buckling": 0.557231346996828,
      "fos_yielding": 1.352228017419762,
      "deflection": 0.008176552561538122,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_208": {
      "node_id": "node_208",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 215.49 kg\n  Factor of Safety: 0.68\n  Max Deflection: 6.58e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.4865460312343,
      "fos_buckling": 0.679643523881042,
      "fos_yielding": 1.680183687991202,
      "deflection": 0.006580151708257027,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.263)"
      },
      "parent_node_id": "node_207",
      "improvement_over_parent": null
    },
    "node_209": {
      "node_id": "node_209",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 256.64 kg\n  Factor of Safety: 0.79\n  Max Deflection: 5.53e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.63516732896915,
      "fos_buckling": 0.7934222223960862,
      "fos_yielding": 1.9978917453833662,
      "deflection": 0.005532888359118594,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.209)"
      },
      "parent_node_id": "node_208",
      "improvement_over_parent": null
    },
    "node_210": {
      "node_id": "node_210",
      "content": "MODIFICATION: Increase 6 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 267.23 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.2331066879749,
      "fos_buckling": 1.0062604345316528,
      "fos_yielding": 1.997675413535997,
      "deflection": 0.005010531991603935,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.357)"
      },
      "parent_node_id": "node_209",
      "improvement_over_parent": null
    },
    "node_211": {
      "node_id": "node_211",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1305438303647,
      "fos_buckling": 1.5224848598661676,
      "fos_yielding": 2.011796991082092,
      "deflection": 0.004042035576739858,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_210",
      "improvement_over_parent": null
    },
    "node_212": {
      "node_id": "node_212",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_211",
      "improvement_over_parent": null
    },
    "node_213": {
      "node_id": "node_213",
      "content": "INITIAL DESIGN (Trace 30)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0021)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 188.62 kg\n  Factor of Safety: 0.81\n  Max Deflection: 9.39e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.61555976033065,
      "fos_buckling": 0.8107777392269307,
      "fos_yielding": 1.4368705898778271,
      "deflection": 0.009390901813156407,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_214": {
      "node_id": "node_214",
      "content": "MODIFICATION: Increase 0 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 194.38 kg\n  Factor of Safety: 0.81\n  Max Deflection: 8.30e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.37868758641673,
      "fos_buckling": 0.8104560235383438,
      "fos_yielding": 1.7474024377156432,
      "deflection": 0.008304891988070865,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.458)"
      },
      "parent_node_id": "node_213",
      "improvement_over_parent": null
    },
    "node_215": {
      "node_id": "node_215",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n\nPerformance:\n  Mass: 214.29 kg\n  Factor of Safety: 0.82\n  Max Deflection: 8.27e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.292495919641,
      "fos_buckling": 0.8223185405664992,
      "fos_yielding": 1.7969143965711134,
      "deflection": 0.008266915346282759,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003769)"
      },
      "parent_node_id": "node_214",
      "improvement_over_parent": null
    },
    "node_216": {
      "node_id": "node_216",
      "content": "MODIFICATION: Increase 0 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n\nPerformance:\n  Mass: 221.45 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.63e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.4477645161502,
      "fos_buckling": 0.8322675084060155,
      "fos_yielding": 1.7688762943713012,
      "deflection": 0.00763037837781562,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.404)"
      },
      "parent_node_id": "node_215",
      "improvement_over_parent": null
    },
    "node_217": {
      "node_id": "node_217",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 225.46 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.45678266054983,
      "fos_buckling": 1.224511183179394,
      "fos_yielding": 1.5498692295322092,
      "deflection": 0.005234774053865049,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002486)"
      },
      "parent_node_id": "node_216",
      "improvement_over_parent": null
    },
    "node_218": {
      "node_id": "node_218",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.24255049867696,
      "fos_buckling": 1.5230645955568207,
      "fos_yielding": 2.0127689875593515,
      "deflection": 0.004040565538407349,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.330)"
      },
      "parent_node_id": "node_217",
      "improvement_over_parent": null
    },
    "node_219": {
      "node_id": "node_219",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_218",
      "improvement_over_parent": null
    },
    "node_220": {
      "node_id": "node_220",
      "content": "INITIAL DESIGN (Trace 31)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 160.32 kg\n  Factor of Safety: 0.50\n  Max Deflection: 1.06e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.32122176813917,
      "fos_buckling": 0.5046374010658075,
      "fos_yielding": 1.2147226331009906,
      "deflection": 0.010636790369515769,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_221": {
      "node_id": "node_221",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 196.04 kg\n  Factor of Safety: 0.62\n  Max Deflection: 6.94e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.03983121806093,
      "fos_buckling": 0.61743486246217,
      "fos_yielding": 1.2147226331009906,
      "deflection": 0.006943426651799581,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005014)"
      },
      "parent_node_id": "node_220",
      "improvement_over_parent": null
    },
    "node_222": {
      "node_id": "node_222",
      "content": "MODIFICATION: Increase 9 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0081)]\n\nPerformance:\n  Mass: 215.22 kg\n  Factor of Safety: 0.62\n  Max Deflection: 6.66e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.21865275740208,
      "fos_buckling": 0.6166211196562179,
      "fos_yielding": 1.2147226331009906,
      "deflection": 0.006659546938958566,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.608)"
      },
      "parent_node_id": "node_221",
      "improvement_over_parent": null
    },
    "node_223": {
      "node_id": "node_223",
      "content": "MODIFICATION: Increase 6 thickness by 60%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0081)]\n\nPerformance:\n  Mass: 218.18 kg\n  Factor of Safety: 0.62\n  Max Deflection: 6.66e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.1812181104758,
      "fos_buckling": 0.6166211196562179,
      "fos_yielding": 1.8949735164666466,
      "deflection": 0.006659546938958566,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.603)"
      },
      "parent_node_id": "node_222",
      "improvement_over_parent": null
    },
    "node_224": {
      "node_id": "node_224",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0081)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 243.80 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.7977614886096,
      "fos_buckling": 0.9539472513121324,
      "fos_yielding": 1.630262187543608,
      "deflection": 0.005101954805399013,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004246)"
      },
      "parent_node_id": "node_223",
      "improvement_over_parent": null
    },
    "node_225": {
      "node_id": "node_225",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0099)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 294.37 kg\n  Factor of Safety: 1.13\n  Max Deflection: 4.23e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.36591817051806,
      "fos_buckling": 1.1343783159675231,
      "fos_yielding": 1.9701266586421813,
      "deflection": 0.00422912724465278,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.230)"
      },
      "parent_node_id": "node_224",
      "improvement_over_parent": null
    },
    "node_226": {
      "node_id": "node_226",
      "content": "MODIFICATION: Increase 4 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0099)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 295.48 kg\n  Factor of Safety: 1.13\n  Max Deflection: 4.21e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 295.47931013489085,
      "fos_buckling": 1.1336208904551572,
      "fos_yielding": 1.9704590728189404,
      "deflection": 0.004207703348950236,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.206)"
      },
      "parent_node_id": "node_225",
      "improvement_over_parent": null
    },
    "node_227": {
      "node_id": "node_227",
      "content": "MODIFICATION: Increase 3 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0099)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 299.78 kg\n  Factor of Safety: 1.16\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 299.77756320334,
      "fos_buckling": 1.1641139083813852,
      "fos_yielding": 1.9568318292276534,
      "deflection": 0.004146426592850272,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.235)"
      },
      "parent_node_id": "node_226",
      "improvement_over_parent": null
    },
    "node_228": {
      "node_id": "node_228",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_227",
      "improvement_over_parent": null
    },
    "node_229": {
      "node_id": "node_229",
      "content": "INITIAL DESIGN (Trace 32)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_230": {
      "node_id": "node_230",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 266.39 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.90e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 266.3900905689659,
      "fos_buckling": 1.072306855734453,
      "fos_yielding": 2.2871342448230187,
      "deflection": 0.0048973599743744765,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_229",
      "improvement_over_parent": null
    },
    "node_231": {
      "node_id": "node_231",
      "content": "MODIFICATION: Increase 4 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 267.77 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.77050489519627,
      "fos_buckling": 1.0721040820372654,
      "fos_yielding": 2.287134244823018,
      "deflection": 0.004879359435227468,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.395)"
      },
      "parent_node_id": "node_230",
      "improvement_over_parent": null
    },
    "node_232": {
      "node_id": "node_232",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 292.15 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.07e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.15197685602834,
      "fos_buckling": 1.4764920245553455,
      "fos_yielding": 2.0120667405094537,
      "deflection": 0.0040655918350392525,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_231",
      "improvement_over_parent": null
    },
    "node_233": {
      "node_id": "node_233",
      "content": "MODIFICATION: Increase 4 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0040)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.07 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.04e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.0720779813297,
      "fos_buckling": 1.4706453155571908,
      "fos_yielding": 2.0082149246278567,
      "deflection": 0.00403781034424679,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.198)"
      },
      "parent_node_id": "node_232",
      "improvement_over_parent": null
    },
    "node_234": {
      "node_id": "node_234",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_233",
      "improvement_over_parent": null
    },
    "node_235": {
      "node_id": "node_235",
      "content": "INITIAL DESIGN (Trace 33)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 198.36 kg\n  Factor of Safety: 1.27\n  Max Deflection: 1.22e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.36414914665707,
      "fos_buckling": 1.2705447042968219,
      "fos_yielding": 1.561107228611381,
      "deflection": 12179813654470.652,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_236": {
      "node_id": "node_236",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 224.26 kg\n  Factor of Safety: 0.48\n  Max Deflection: 1.02e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.26158628904685,
      "fos_buckling": 0.4791060841389439,
      "fos_yielding": 1.1253073712763755,
      "deflection": 10209762289245.008,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_235",
      "improvement_over_parent": null
    },
    "node_237": {
      "node_id": "node_237",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 248.64 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.64305824987895,
      "fos_buckling": 0.5215799712206947,
      "fos_yielding": 1.5726216873229493,
      "deflection": 0.007520512668769338,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_236",
      "improvement_over_parent": null
    },
    "node_238": {
      "node_id": "node_238",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2249894178248,
      "fos_buckling": 1.522899212040269,
      "fos_yielding": 2.012447214776498,
      "deflection": 0.004040695454252283,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_237",
      "improvement_over_parent": null
    },
    "node_239": {
      "node_id": "node_239",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_238",
      "improvement_over_parent": null
    },
    "node_240": {
      "node_id": "node_240",
      "content": "INITIAL DESIGN (Trace 34)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 195.94 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.97e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.93561336488293,
      "fos_buckling": 1.07464442763021,
      "fos_yielding": 1.3753312310560384,
      "deflection": 0.005972434219234003,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_241": {
      "node_id": "node_241",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 219.21 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.35e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.21312610086517,
      "fos_buckling": 1.184160026680875,
      "fos_yielding": 1.5376960050328787,
      "deflection": 0.0053456919244973915,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.127)"
      },
      "parent_node_id": "node_240",
      "improvement_over_parent": null
    },
    "node_242": {
      "node_id": "node_242",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 249.03 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.71e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.03403185465385,
      "fos_buckling": 1.318920585538873,
      "fos_yielding": 1.7453744445163761,
      "deflection": 0.004713975616633364,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.147)"
      },
      "parent_node_id": "node_241",
      "improvement_over_parent": null
    },
    "node_243": {
      "node_id": "node_243",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 287.19 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.19191237373076,
      "fos_buckling": 1.482336311999504,
      "fos_yielding": 2.0105694165791363,
      "deflection": 0.004096996348105724,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.168)"
      },
      "parent_node_id": "node_242",
      "improvement_over_parent": null
    },
    "node_244": {
      "node_id": "node_244",
      "content": "MODIFICATION: Increase 8 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.05 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0508901425909,
      "fos_buckling": 1.5221598549711917,
      "fos_yielding": 2.011254888875982,
      "deflection": 0.004043066724628989,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.238)"
      },
      "parent_node_id": "node_243",
      "improvement_over_parent": null
    },
    "node_245": {
      "node_id": "node_245",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_244",
      "improvement_over_parent": null
    },
    "node_246": {
      "node_id": "node_246",
      "content": "INITIAL DESIGN (Trace 35)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 139.36 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.66e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 139.3583674489178,
      "fos_buckling": 0.3380823139848352,
      "fos_yielding": 0.9382768137820892,
      "deflection": 0.016557307499382664,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_247": {
      "node_id": "node_247",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n\nPerformance:\n  Mass: 173.81 kg\n  Factor of Safety: 0.41\n  Max Deflection: 1.33e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.80796075009286,
      "fos_buckling": 0.4131066414344924,
      "fos_yielding": 1.1690169518174809,
      "deflection": 0.013294646783977971,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.267)"
      },
      "parent_node_id": "node_246",
      "improvement_over_parent": null
    },
    "node_248": {
      "node_id": "node_248",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 199.03 kg\n  Factor of Safety: 0.47\n  Max Deflection: 1.16e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.0306788215778,
      "fos_buckling": 0.4658784098065607,
      "fos_yielding": 1.3376279576962433,
      "deflection": 0.011621836394031975,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.159)"
      },
      "parent_node_id": "node_247",
      "improvement_over_parent": null
    },
    "node_249": {
      "node_id": "node_249",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 242.23 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.58e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.22873675903003,
      "fos_buckling": 0.5215866341126549,
      "fos_yielding": 1.5720375195608165,
      "deflection": 0.007576737560799935,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_248",
      "improvement_over_parent": null
    },
    "node_250": {
      "node_id": "node_250",
      "content": "MODIFICATION: Increase 2 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 248.52 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.52485214308706,
      "fos_buckling": 0.5213613882372113,
      "fos_yielding": 1.5718261416562826,
      "deflection": 0.007523935924934956,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.353)"
      },
      "parent_node_id": "node_249",
      "improvement_over_parent": null
    },
    "node_251": {
      "node_id": "node_251",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.11 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1067833110329,
      "fos_buckling": 1.522772084166748,
      "fos_yielding": 2.0114784727218478,
      "deflection": 0.004042133028555478,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_250",
      "improvement_over_parent": null
    },
    "node_252": {
      "node_id": "node_252",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_251",
      "improvement_over_parent": null
    },
    "node_253": {
      "node_id": "node_253",
      "content": "INITIAL DESIGN (Trace 36)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0012)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0012)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0011)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0010)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0008)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0007)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0010)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0013)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0011)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0011)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0013)]\n\nPerformance:\n  Mass: 66.15 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.77e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 66.1495506230299,
      "fos_buckling": 0.39662108088126863,
      "fos_yielding": 0.45632668713994995,
      "deflection": 0.017675947260491348,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_254": {
      "node_id": "node_254",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0016)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0016)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0014)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0014)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0011)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0009)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0013)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0017)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0015)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0015)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0018)]\n\nPerformance:\n  Mass: 87.59 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.34e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 87.58893050649529,
      "fos_buckling": 0.5184553750113946,
      "fos_yielding": 0.6039311727663943,
      "deflection": 0.013366152701373531,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_253",
      "improvement_over_parent": null
    },
    "node_255": {
      "node_id": "node_255",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0020)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0017)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0017)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0013)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0011)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0016)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0018)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0018)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0021)]\n\nPerformance:\n  Mass: 106.04 kg\n  Factor of Safety: 0.62\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 106.04236264375929,
      "fos_buckling": 0.6207058377692369,
      "fos_yielding": 0.730863554312711,
      "deflection": 0.011052122600813265,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.217)"
      },
      "parent_node_id": "node_254",
      "improvement_over_parent": null
    },
    "node_256": {
      "node_id": "node_256",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0021)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 130.06 kg\n  Factor of Safety: 0.75\n  Max Deflection: 9.02e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 130.06162242239515,
      "fos_buckling": 0.7501852568478617,
      "fos_yielding": 0.8959219790564027,
      "deflection": 0.009023732289884415,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.235)"
      },
      "parent_node_id": "node_255",
      "improvement_over_parent": null
    },
    "node_257": {
      "node_id": "node_257",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 169.44 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.94e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.43731920493065,
      "fos_buckling": 0.9536506153602071,
      "fos_yielding": 1.166121155757583,
      "deflection": 0.006942644103160771,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.318)"
      },
      "parent_node_id": "node_256",
      "improvement_over_parent": null
    },
    "node_258": {
      "node_id": "node_258",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 204.82 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.76e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.82175083865866,
      "fos_buckling": 1.1272236374183209,
      "fos_yielding": 1.4085222710861585,
      "deflection": 0.005755106011520284,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.222)"
      },
      "parent_node_id": "node_257",
      "improvement_over_parent": null
    },
    "node_259": {
      "node_id": "node_259",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 239.46 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.93e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.45787917832536,
      "fos_buckling": 1.2886815146188868,
      "fos_yielding": 1.6454224659454286,
      "deflection": 0.004932589537912321,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.182)"
      },
      "parent_node_id": "node_258",
      "improvement_over_parent": null
    },
    "node_260": {
      "node_id": "node_260",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.32 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3201475685917,
      "fos_buckling": 1.5232818994522483,
      "fos_yielding": 2.0130890550562777,
      "deflection": 0.004039419627886536,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.247)"
      },
      "parent_node_id": "node_259",
      "improvement_over_parent": null
    },
    "node_261": {
      "node_id": "node_261",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_260",
      "improvement_over_parent": null
    },
    "node_262": {
      "node_id": "node_262",
      "content": "INITIAL DESIGN (Trace 37)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_263": {
      "node_id": "node_263",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 232.75 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.46e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.74575352314326,
      "fos_buckling": 0.9812069768372644,
      "fos_yielding": 2.050794496722441,
      "deflection": 0.005458480138295741,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004314)"
      },
      "parent_node_id": "node_262",
      "improvement_over_parent": null
    },
    "node_264": {
      "node_id": "node_264",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 260.51 kg\n  Factor of Safety: 1.01\n  Max Deflection: 4.68e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.50644236670934,
      "fos_buckling": 1.0076621045092566,
      "fos_yielding": 1.8242940913121302,
      "deflection": 0.004679071927998303,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004632)"
      },
      "parent_node_id": "node_263",
      "improvement_over_parent": null
    },
    "node_265": {
      "node_id": "node_265",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 290.63 kg\n  Factor of Safety: 1.12\n  Max Deflection: 4.20e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.6291837708924,
      "fos_buckling": 1.1192226423025504,
      "fos_yielding": 2.033507961516739,
      "deflection": 0.004199595018420185,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.127)"
      },
      "parent_node_id": "node_264",
      "improvement_over_parent": null
    },
    "node_266": {
      "node_id": "node_266",
      "content": "MODIFICATION: Increase 5 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0060)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.44 kg\n  Factor of Safety: 1.09\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.4437104346487,
      "fos_buckling": 1.0934364079125685,
      "fos_yielding": 2.3637381812755844,
      "deflection": 0.004160675992082109,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.321)"
      },
      "parent_node_id": "node_265",
      "improvement_over_parent": null
    },
    "node_267": {
      "node_id": "node_267",
      "content": "MODIFICATION: Increase 5 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0092)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 298.86 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 298.85881677449424,
      "fos_buckling": 1.0672072148971061,
      "fos_yielding": 2.307037174663728,
      "deflection": 0.004119158921285837,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.522)"
      },
      "parent_node_id": "node_266",
      "improvement_over_parent": null
    },
    "node_268": {
      "node_id": "node_268",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_267",
      "improvement_over_parent": null
    },
    "node_269": {
      "node_id": "node_269",
      "content": "INITIAL DESIGN (Trace 38)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 199.75 kg\n  Factor of Safety: 0.96\n  Max Deflection: 7.67e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.74852014361548,
      "fos_buckling": 0.9582121682778878,
      "fos_yielding": 1.6689077404452821,
      "deflection": 7671582800825.808,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_270": {
      "node_id": "node_270",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 224.13 kg\n  Factor of Safety: 0.96\n  Max Deflection: 8.63e+12 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.12999210444758,
      "fos_buckling": 0.9582121682778878,
      "fos_yielding": 1.7677350891998267,
      "deflection": 8628842112507.498,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_269",
      "improvement_over_parent": null
    },
    "node_271": {
      "node_id": "node_271",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 267.33 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.3280500418998,
      "fos_buckling": 1.0067022032519606,
      "fos_yielding": 1.998318804428132,
      "deflection": 0.0050085995274929285,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_270",
      "improvement_over_parent": null
    },
    "node_272": {
      "node_id": "node_272",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2254871842896,
      "fos_buckling": 1.5228813565019252,
      "fos_yielding": 2.012442475860601,
      "deflection": 0.004040688601037944,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_271",
      "improvement_over_parent": null
    },
    "node_273": {
      "node_id": "node_273",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_272",
      "improvement_over_parent": null
    },
    "node_274": {
      "node_id": "node_274",
      "content": "INITIAL DESIGN (Trace 39)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_275": {
      "node_id": "node_275",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 170.07 kg\n  Factor of Safety: 0.37\n  Max Deflection: 1.38e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.07033363699068,
      "fos_buckling": 0.36955490152439535,
      "fos_yielding": 1.156297035951865,
      "deflection": 0.013776487795319167,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002817)"
      },
      "parent_node_id": "node_274",
      "improvement_over_parent": null
    },
    "node_276": {
      "node_id": "node_276",
      "content": "MODIFICATION: Increase 2 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 177.41 kg\n  Factor of Safety: 0.46\n  Max Deflection: 1.28e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.40644430491295,
      "fos_buckling": 0.4636468926981153,
      "fos_yielding": 1.1557075768877514,
      "deflection": 0.012756909789141858,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.527)"
      },
      "parent_node_id": "node_275",
      "improvement_over_parent": null
    },
    "node_277": {
      "node_id": "node_277",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n\nPerformance:\n  Mass: 214.70 kg\n  Factor of Safety: 0.46\n  Max Deflection: 8.69e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.70454796630827,
      "fos_buckling": 0.46245813735105457,
      "fos_yielding": 1.359298955679753,
      "deflection": 0.008693093690167457,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005254)"
      },
      "parent_node_id": "node_276",
      "improvement_over_parent": null
    },
    "node_278": {
      "node_id": "node_278",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 253.19 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.67e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.1942425079517,
      "fos_buckling": 1.3502764659764546,
      "fos_yielding": 1.7391576745827824,
      "deflection": 0.004668804667206044,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005337)"
      },
      "parent_node_id": "node_277",
      "improvement_over_parent": null
    },
    "node_279": {
      "node_id": "node_279",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2970615829526,
      "fos_buckling": 1.5230397117317425,
      "fos_yielding": 2.012801026859966,
      "deflection": 0.004039814630389524,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.174)"
      },
      "parent_node_id": "node_278",
      "improvement_over_parent": null
    },
    "node_280": {
      "node_id": "node_280",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_279",
      "improvement_over_parent": null
    },
    "node_281": {
      "node_id": "node_281",
      "content": "INITIAL DESIGN (Trace 40)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 188.09 kg\n  Factor of Safety: 0.76\n  Max Deflection: 8.94e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.08882255927898,
      "fos_buckling": 0.7577201411399025,
      "fos_yielding": 1.2818989848806257,
      "deflection": 0.008936143260680228,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_282": {
      "node_id": "node_282",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 217.25 kg\n  Factor of Safety: 0.86\n  Max Deflection: 7.74e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.25495942371845,
      "fos_buckling": 0.8580165848716402,
      "fos_yielding": 1.4818630720485135,
      "deflection": 0.007743952155547054,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.166)"
      },
      "parent_node_id": "node_281",
      "improvement_over_parent": null
    },
    "node_283": {
      "node_id": "node_283",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 221.45 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.38e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.4528989589801,
      "fos_buckling": 1.1184867639251228,
      "fos_yielding": 1.2893833516420534,
      "deflection": 0.005383571031859013,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002612)"
      },
      "parent_node_id": "node_282",
      "improvement_over_parent": null
    },
    "node_284": {
      "node_id": "node_284",
      "content": "MODIFICATION: Increase 8 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0057)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 230.17 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.31e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.16878622861293,
      "fos_buckling": 1.1078429430041647,
      "fos_yielding": 1.277113232820816,
      "deflection": 0.0053094817885407436,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.387)"
      },
      "parent_node_id": "node_283",
      "improvement_over_parent": null
    },
    "node_285": {
      "node_id": "node_285",
      "content": "MODIFICATION: Increase 0 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0057)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 236.25 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.25011371501506,
      "fos_buckling": 1.1069606389300528,
      "fos_yielding": 1.276096119144608,
      "deflection": 0.005095696851674445,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.307)"
      },
      "parent_node_id": "node_284",
      "improvement_over_parent": null
    },
    "node_286": {
      "node_id": "node_286",
      "content": "MODIFICATION: Increase 6 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0063)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0057)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 245.39 kg\n  Factor of Safety: 1.11\n  Max Deflection: 4.90e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.39482636840705,
      "fos_buckling": 1.1061264423085653,
      "fos_yielding": 1.275134463387532,
      "deflection": 0.0049001396094561864,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.289)"
      },
      "parent_node_id": "node_285",
      "improvement_over_parent": null
    },
    "node_287": {
      "node_id": "node_287",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0080)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0073)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 304.34 kg\n  Factor of Safety: 1.34\n  Max Deflection: 3.96e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 304.3412361133606,
      "fos_buckling": 1.3417470262153623,
      "fos_yielding": 1.5890640431558924,
      "deflection": 0.0039608999241786454,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.266)"
      },
      "parent_node_id": "node_286",
      "improvement_over_parent": null
    },
    "node_288": {
      "node_id": "node_288",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_287",
      "improvement_over_parent": null
    },
    "node_289": {
      "node_id": "node_289",
      "content": "INITIAL DESIGN (Trace 41)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0020)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 121.19 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.18e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 121.1900691011553,
      "fos_buckling": 0.38738800187587896,
      "fos_yielding": 0.9526114720889144,
      "deflection": 0.01177843635369347,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_290": {
      "node_id": "node_290",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 139.85 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 139.84614386804077,
      "fos_buckling": 0.4433911969753463,
      "fos_yielding": 1.0984935617848592,
      "deflection": 0.010213628314471365,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.161)"
      },
      "parent_node_id": "node_289",
      "improvement_over_parent": null
    },
    "node_291": {
      "node_id": "node_291",
      "content": "MODIFICATION: Increase 6 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 146.50 kg\n  Factor of Safety: 0.60\n  Max Deflection: 9.07e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.50422391589075,
      "fos_buckling": 0.6012351405378753,
      "fos_yielding": 1.0984186168272396,
      "deflection": 0.009071991639985266,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.410)"
      },
      "parent_node_id": "node_290",
      "improvement_over_parent": null
    },
    "node_292": {
      "node_id": "node_292",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 183.90 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.24e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.89646463616478,
      "fos_buckling": 0.7352811828600947,
      "fos_yielding": 1.3775182867498488,
      "deflection": 0.007244088442134234,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.271)"
      },
      "parent_node_id": "node_291",
      "improvement_over_parent": null
    },
    "node_293": {
      "node_id": "node_293",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n\nPerformance:\n  Mass: 201.73 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.84e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.73301050942692,
      "fos_buckling": 1.1123650332268302,
      "fos_yielding": 1.3873213630899683,
      "deflection": 0.005842410731585199,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003351)"
      },
      "parent_node_id": "node_292",
      "improvement_over_parent": null
    },
    "node_294": {
      "node_id": "node_294",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n\nPerformance:\n  Mass: 260.17 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.55e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.1721248632793,
      "fos_buckling": 1.3812053841558136,
      "fos_yielding": 1.7868529732968395,
      "deflection": 0.004545513735420016,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.314)"
      },
      "parent_node_id": "node_293",
      "improvement_over_parent": null
    },
    "node_295": {
      "node_id": "node_295",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.09 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0863165948099,
      "fos_buckling": 1.5222374982006728,
      "fos_yielding": 2.01141531678884,
      "deflection": 0.004042746929151704,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.139)"
      },
      "parent_node_id": "node_294",
      "improvement_over_parent": null
    },
    "node_296": {
      "node_id": "node_296",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_295",
      "improvement_over_parent": null
    },
    "node_297": {
      "node_id": "node_297",
      "content": "INITIAL DESIGN (Trace 42)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 160.04 kg\n  Factor of Safety: 0.41\n  Max Deflection: 1.17e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.0381277562734,
      "fos_buckling": 0.4062187592498365,
      "fos_yielding": 0.9010561532312883,
      "deflection": 0.011681249841683318,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_298": {
      "node_id": "node_298",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 188.32 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.94e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.32413825620287,
      "fos_buckling": 0.4678958411166022,
      "fos_yielding": 1.063889697003208,
      "deflection": 0.009937388574816528,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.189)"
      },
      "parent_node_id": "node_297",
      "improvement_over_parent": null
    },
    "node_299": {
      "node_id": "node_299",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n\nPerformance:\n  Mass: 216.28 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.59e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.2818946038792,
      "fos_buckling": 0.9787850920241303,
      "fos_yielding": 1.5413827642801259,
      "deflection": 0.005587341053694277,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003860)"
      },
      "parent_node_id": "node_298",
      "improvement_over_parent": null
    },
    "node_300": {
      "node_id": "node_300",
      "content": "MODIFICATION: Increase 7 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n\nPerformance:\n  Mass: 220.54 kg\n  Factor of Safety: 0.96\n  Max Deflection: 5.53e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.54178435337903,
      "fos_buckling": 0.9595058685701918,
      "fos_yielding": 1.5419850827851376,
      "deflection": 0.005533688091400275,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.185)"
      },
      "parent_node_id": "node_299",
      "improvement_over_parent": null
    },
    "node_301": {
      "node_id": "node_301",
      "content": "MODIFICATION: Increase 5 thickness by 60%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n\nPerformance:\n  Mass: 221.97 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.39e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.96969396493685,
      "fos_buckling": 1.119405399680023,
      "fos_yielding": 1.530927609294341,
      "deflection": 0.005387571522752718,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.603)"
      },
      "parent_node_id": "node_300",
      "improvement_over_parent": null
    },
    "node_302": {
      "node_id": "node_302",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0056)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n\nPerformance:\n  Mass: 260.01 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.61e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.01313711106627,
      "fos_buckling": 1.2849520539723824,
      "fos_yielding": 1.7918761087562178,
      "deflection": 0.004608298795690935,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.186)"
      },
      "parent_node_id": "node_301",
      "improvement_over_parent": null
    },
    "node_303": {
      "node_id": "node_303",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0064)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n\nPerformance:\n  Mass: 292.65 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.6475983894327,
      "fos_buckling": 1.4208377622959933,
      "fos_yielding": 2.0153951644214265,
      "deflection": 0.0041012265940951215,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_302",
      "improvement_over_parent": null
    },
    "node_304": {
      "node_id": "node_304",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_303",
      "improvement_over_parent": null
    },
    "node_305": {
      "node_id": "node_305",
      "content": "INITIAL DESIGN (Trace 43)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 211.05 kg\n  Factor of Safety: 0.92\n  Max Deflection: 6.00e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.0491116628215,
      "fos_buckling": 0.9206799067240669,
      "fos_yielding": 1.3787901869152448,
      "deflection": 0.005999408183950113,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_306": {
      "node_id": "node_306",
      "content": "MODIFICATION: Increase 5 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 213.31 kg\n  Factor of Safety: 0.92\n  Max Deflection: 6.00e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.31307941929478,
      "fos_buckling": 0.9206799067240669,
      "fos_yielding": 1.898312329219677,
      "deflection": 0.005999408183950113,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.406)"
      },
      "parent_node_id": "node_305",
      "improvement_over_parent": null
    },
    "node_307": {
      "node_id": "node_307",
      "content": "MODIFICATION: Increase 7 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 223.20 kg\n  Factor of Safety: 0.92\n  Max Deflection: 5.83e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.20038975280838,
      "fos_buckling": 0.9200545327687388,
      "fos_yielding": 1.8983123292196766,
      "deflection": 0.005828577025732786,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.610)"
      },
      "parent_node_id": "node_306",
      "improvement_over_parent": null
    },
    "node_308": {
      "node_id": "node_308",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 243.44 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.44163301802456,
      "fos_buckling": 1.3065792802204492,
      "fos_yielding": 1.6715058536923368,
      "deflection": 0.004853159400060961,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003971)"
      },
      "parent_node_id": "node_307",
      "improvement_over_parent": null
    },
    "node_309": {
      "node_id": "node_309",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.10 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0988197748213,
      "fos_buckling": 1.5222017194818585,
      "fos_yielding": 2.010234877618866,
      "deflection": 0.004042553208130371,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_308",
      "improvement_over_parent": null
    },
    "node_310": {
      "node_id": "node_310",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_309",
      "improvement_over_parent": null
    },
    "node_311": {
      "node_id": "node_311",
      "content": "INITIAL DESIGN (Trace 44)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 223.30 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.76e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.29739965792567,
      "fos_buckling": 0.8958782550076348,
      "fos_yielding": 1.7336230804040489,
      "deflection": 0.005764950769649519,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_312": {
      "node_id": "node_312",
      "content": "MODIFICATION: Increase 4 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 225.61 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.76e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.6103963272896,
      "fos_buckling": 0.8958782550076348,
      "fos_yielding": 1.7336230804040489,
      "deflection": 0.005764950769649519,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.658)"
      },
      "parent_node_id": "node_311",
      "improvement_over_parent": null
    },
    "node_313": {
      "node_id": "node_313",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.52 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.5197128756061,
      "fos_buckling": 1.0077639291239184,
      "fos_yielding": 2.000182373914655,
      "deflection": 0.005003267817337118,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_312",
      "improvement_over_parent": null
    },
    "node_314": {
      "node_id": "node_314",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.43 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4322495072231,
      "fos_buckling": 1.5238341239877624,
      "fos_yielding": 2.013980511851479,
      "deflection": 0.0040377538930957205,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_313",
      "improvement_over_parent": null
    },
    "node_315": {
      "node_id": "node_315",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_314",
      "improvement_over_parent": null
    },
    "node_316": {
      "node_id": "node_316",
      "content": "INITIAL DESIGN (Trace 45)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 263.47 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.48e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.47423505926446,
      "fos_buckling": 1.2207002447098803,
      "fos_yielding": 2.011220593856376,
      "deflection": 0.004480088114568472,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_317": {
      "node_id": "node_317",
      "content": "MODIFICATION: Increase 10 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 274.02 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.25e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 274.01687139340993,
      "fos_buckling": 1.3318512358153212,
      "fos_yielding": 2.042369744409812,
      "deflection": 0.004250352134862524,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.340)"
      },
      "parent_node_id": "node_316",
      "improvement_over_parent": null
    },
    "node_318": {
      "node_id": "node_318",
      "content": "MODIFICATION: Increase 2 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 283.13 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.12799775513224,
      "fos_buckling": 1.4480211995632035,
      "fos_yielding": 2.0437419755440556,
      "deflection": 0.0041397349264826085,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.595)"
      },
      "parent_node_id": "node_317",
      "improvement_over_parent": null
    },
    "node_319": {
      "node_id": "node_319",
      "content": "MODIFICATION: Increase 9 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.20432367652023,
      "fos_buckling": 1.5226546380446815,
      "fos_yielding": 2.0124637299606865,
      "deflection": 0.004040912106832652,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.529)"
      },
      "parent_node_id": "node_318",
      "improvement_over_parent": null
    },
    "node_320": {
      "node_id": "node_320",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_319",
      "improvement_over_parent": null
    },
    "node_321": {
      "node_id": "node_321",
      "content": "INITIAL DESIGN (Trace 46)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 149.12 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.93e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.12003963078263,
      "fos_buckling": 0.8448155000757377,
      "fos_yielding": 1.0324046101472344,
      "deflection": 0.007928475858000305,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_322": {
      "node_id": "node_322",
      "content": "MODIFICATION: Increase 5 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 149.56 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.86e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.56350524341434,
      "fos_buckling": 0.8523075952819893,
      "fos_yielding": 1.0298202920849822,
      "deflection": 0.00785616449360175,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.209)"
      },
      "parent_node_id": "node_321",
      "improvement_over_parent": null
    },
    "node_323": {
      "node_id": "node_323",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 183.85 kg\n  Factor of Safety: 1.03\n  Max Deflection: 6.40e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.85491515679806,
      "fos_buckling": 1.0254159278955968,
      "fos_yielding": 1.2649535694384058,
      "deflection": 0.006403680574631315,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.242)"
      },
      "parent_node_id": "node_322",
      "improvement_over_parent": null
    },
    "node_324": {
      "node_id": "node_324",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 208.55 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.65e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.54985601102706,
      "fos_buckling": 1.144987187358626,
      "fos_yielding": 1.4340592171467383,
      "deflection": 0.005653527776869541,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.143)"
      },
      "parent_node_id": "node_323",
      "improvement_over_parent": null
    },
    "node_325": {
      "node_id": "node_325",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 254.05 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.04577560622067,
      "fos_buckling": 1.3541771320513223,
      "fos_yielding": 1.7451123875150827,
      "deflection": 0.0046533493692670624,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.236)"
      },
      "parent_node_id": "node_324",
      "improvement_over_parent": null
    },
    "node_326": {
      "node_id": "node_326",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.58 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.5844291476308,
      "fos_buckling": 1.5243633492112703,
      "fos_yielding": 2.0149181536634484,
      "deflection": 0.004035896510365409,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_325",
      "improvement_over_parent": null
    },
    "node_327": {
      "node_id": "node_327",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_326",
      "improvement_over_parent": null
    },
    "node_328": {
      "node_id": "node_328",
      "content": "INITIAL DESIGN (Trace 47)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 190.70 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.31e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.69712480662812,
      "fos_buckling": 0.8460905358036961,
      "fos_yielding": 1.8495188308355701,
      "deflection": 0.007310087387072681,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_329": {
      "node_id": "node_329",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 236.03 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.93e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.0258604713338,
      "fos_buckling": 1.0091458325901523,
      "fos_yielding": 2.288031052933948,
      "deflection": 0.005925974748939058,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.261)"
      },
      "parent_node_id": "node_328",
      "improvement_over_parent": null
    },
    "node_330": {
      "node_id": "node_330",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 268.94 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.93839710295083,
      "fos_buckling": 1.072442921678665,
      "fos_yielding": 2.288031052933947,
      "deflection": 0.004851061710598367,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_329",
      "improvement_over_parent": null
    },
    "node_331": {
      "node_id": "node_331",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.32 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3198690637829,
      "fos_buckling": 1.5233026362182003,
      "fos_yielding": 2.0132529088413182,
      "deflection": 0.0040393115420582935,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_330",
      "improvement_over_parent": null
    },
    "node_332": {
      "node_id": "node_332",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_331",
      "improvement_over_parent": null
    },
    "node_333": {
      "node_id": "node_333",
      "content": "INITIAL DESIGN (Trace 48)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 207.71 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.26e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.70562262784566,
      "fos_buckling": 0.8548829182725486,
      "fos_yielding": 1.8497415432427016,
      "deflection": 0.007263990349760354,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_334": {
      "node_id": "node_334",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 228.95 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.60e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.9480337879796,
      "fos_buckling": 0.928546685386246,
      "fos_yielding": 2.038558008347244,
      "deflection": 0.006595159738527958,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.111)"
      },
      "parent_node_id": "node_333",
      "improvement_over_parent": null
    },
    "node_335": {
      "node_id": "node_335",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 256.87 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.869758482068,
      "fos_buckling": 1.021496755786841,
      "fos_yielding": 2.286643251536421,
      "deflection": 0.005884290293437012,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.134)"
      },
      "parent_node_id": "node_334",
      "improvement_over_parent": null
    },
    "node_336": {
      "node_id": "node_336",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 287.85 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.8483045311444,
      "fos_buckling": 1.0361137970521748,
      "fos_yielding": 2.2944794998616933,
      "deflection": 0.005882990866072897,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_335",
      "improvement_over_parent": null
    },
    "node_337": {
      "node_id": "node_337",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.06 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.06213456495846,
      "fos_buckling": 1.5222629304193065,
      "fos_yielding": 2.0111338547055033,
      "deflection": 0.004042957990189173,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_336",
      "improvement_over_parent": null
    },
    "node_338": {
      "node_id": "node_338",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_337",
      "improvement_over_parent": null
    },
    "node_339": {
      "node_id": "node_339",
      "content": "INITIAL DESIGN (Trace 49)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 162.42 kg\n  Factor of Safety: 0.63\n  Max Deflection: 1.04e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.4191957296608,
      "fos_buckling": 0.6332257494551642,
      "fos_yielding": 1.2993712043496741,
      "deflection": 0.010382237083147621,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_340": {
      "node_id": "node_340",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n\nPerformance:\n  Mass: 165.36 kg\n  Factor of Safety: 0.93\n  Max Deflection: 7.11e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.35984009464698,
      "fos_buckling": 0.9330882420581114,
      "fos_yielding": 1.1381612952237627,
      "deflection": 0.007112132383840161,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001790)"
      },
      "parent_node_id": "node_339",
      "improvement_over_parent": null
    },
    "node_341": {
      "node_id": "node_341",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n\nPerformance:\n  Mass: 199.33 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.91e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.33390038788897,
      "fos_buckling": 1.1008784000621044,
      "fos_yielding": 1.370950501811792,
      "deflection": 0.005911649785879071,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.218)"
      },
      "parent_node_id": "node_340",
      "improvement_over_parent": null
    },
    "node_342": {
      "node_id": "node_342",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 253.71 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.66e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.7097649964753,
      "fos_buckling": 1.3527053894451064,
      "fos_yielding": 1.7427901649275865,
      "deflection": 0.004659352468472463,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.295)"
      },
      "parent_node_id": "node_341",
      "improvement_over_parent": null
    },
    "node_343": {
      "node_id": "node_343",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.20213627334033,
      "fos_buckling": 1.5227925111622345,
      "fos_yielding": 2.012280740523231,
      "deflection": 0.004041010793715784,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_342",
      "improvement_over_parent": null
    },
    "node_344": {
      "node_id": "node_344",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_343",
      "improvement_over_parent": null
    },
    "node_345": {
      "node_id": "node_345",
      "content": "INITIAL DESIGN (Trace 50)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0021)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0016)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 136.56 kg\n  Factor of Safety: 0.78\n  Max Deflection: 8.63e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 136.5625457893164,
      "fos_buckling": 0.783817312771639,
      "fos_yielding": 0.9947757158208128,
      "deflection": 0.008625507692722143,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_346": {
      "node_id": "node_346",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0021)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 171.86 kg\n  Factor of Safety: 0.96\n  Max Deflection: 6.87e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.85516374288187,
      "fos_buckling": 0.9633447702113843,
      "fos_yielding": 1.2502537925169774,
      "deflection": 0.006867260871166238,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_345",
      "improvement_over_parent": null
    },
    "node_347": {
      "node_id": "node_347",
      "content": "MODIFICATION: Increase 1 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0021)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 177.14 kg\n  Factor of Safety: 0.97\n  Max Deflection: 6.58e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.14418045370456,
      "fos_buckling": 0.9654086591614761,
      "fos_yielding": 1.2683710307988185,
      "deflection": 0.006582370544774809,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.333)"
      },
      "parent_node_id": "node_346",
      "improvement_over_parent": null
    },
    "node_348": {
      "node_id": "node_348",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 206.92 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.65e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.9163565943755,
      "fos_buckling": 1.1058680416004474,
      "fos_yielding": 1.4801312332786951,
      "deflection": 0.005645152089017313,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.179)"
      },
      "parent_node_id": "node_347",
      "improvement_over_parent": null
    },
    "node_349": {
      "node_id": "node_349",
      "content": "MODIFICATION: Increase 8 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 215.45 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.47e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.4544275470714,
      "fos_buckling": 1.1779149645441274,
      "fos_yielding": 1.4813892511235103,
      "deflection": 0.005474536402215001,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.582)"
      },
      "parent_node_id": "node_348",
      "improvement_over_parent": null
    },
    "node_350": {
      "node_id": "node_350",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 255.85 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.62e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.8515636769905,
      "fos_buckling": 1.3624728841441451,
      "fos_yielding": 1.757541864058863,
      "deflection": 0.004620979379787782,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.203)"
      },
      "parent_node_id": "node_349",
      "improvement_over_parent": null
    },
    "node_351": {
      "node_id": "node_351",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.11 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1140716641205,
      "fos_buckling": 1.522715744040525,
      "fos_yielding": 2.0118201175296835,
      "deflection": 0.004042253602512132,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.160)"
      },
      "parent_node_id": "node_350",
      "improvement_over_parent": null
    },
    "node_352": {
      "node_id": "node_352",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_351",
      "improvement_over_parent": null
    },
    "node_353": {
      "node_id": "node_353",
      "content": "INITIAL DESIGN (Trace 51)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 141.06 kg\n  Factor of Safety: 0.42\n  Max Deflection: 1.62e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.0565241716974,
      "fos_buckling": 0.42406174711838857,
      "fos_yielding": 0.8103853314463345,
      "deflection": 0.01623916872077863,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_354": {
      "node_id": "node_354",
      "content": "MODIFICATION: Increase 1 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 147.30 kg\n  Factor of Safety: 0.42\n  Max Deflection: 1.62e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.3028068389354,
      "fos_buckling": 0.42387886270562847,
      "fos_yielding": 0.8102769266878312,
      "deflection": 0.01624470898250804,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.319)"
      },
      "parent_node_id": "node_353",
      "improvement_over_parent": null
    },
    "node_355": {
      "node_id": "node_355",
      "content": "MODIFICATION: Increase 6 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 149.91 kg\n  Factor of Safety: 0.42\n  Max Deflection: 1.58e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.91457431323374,
      "fos_buckling": 0.42387886270562847,
      "fos_yielding": 1.0389511738747546,
      "deflection": 0.015786751234737505,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.546)"
      },
      "parent_node_id": "node_354",
      "improvement_over_parent": null
    },
    "node_356": {
      "node_id": "node_356",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 184.51 kg\n  Factor of Safety: 0.48\n  Max Deflection: 1.09e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.50630207489422,
      "fos_buckling": 0.4770959851063111,
      "fos_yielding": 1.437316810183406,
      "deflection": 0.010851686686577816,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004757)"
      },
      "parent_node_id": "node_355",
      "improvement_over_parent": null
    },
    "node_357": {
      "node_id": "node_357",
      "content": "MODIFICATION: Increase 7 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 194.04 kg\n  Factor of Safety: 0.48\n  Max Deflection: 9.24e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.0380255972402,
      "fos_buckling": 0.47678295788271746,
      "fos_yielding": 1.4792617186293975,
      "deflection": 0.009239380985903553,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.637)"
      },
      "parent_node_id": "node_356",
      "improvement_over_parent": null
    },
    "node_358": {
      "node_id": "node_358",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 250.25 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.24741547447115,
      "fos_buckling": 0.5887715440010005,
      "fos_yielding": 1.9019906524182013,
      "deflection": 0.0071873862811089794,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.318)"
      },
      "parent_node_id": "node_357",
      "improvement_over_parent": null
    },
    "node_359": {
      "node_id": "node_359",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.45 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4454734119234,
      "fos_buckling": 1.5236342564201113,
      "fos_yielding": 2.013652750910346,
      "deflection": 0.004037839073300187,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_358",
      "improvement_over_parent": null
    },
    "node_360": {
      "node_id": "node_360",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_359",
      "improvement_over_parent": null
    },
    "node_361": {
      "node_id": "node_361",
      "content": "INITIAL DESIGN (Trace 52)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 200.66 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.65509902698977,
      "fos_buckling": 1.1299237348155309,
      "fos_yielding": 1.416980347752327,
      "deflection": 0.005942872354086788,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_362": {
      "node_id": "node_362",
      "content": "MODIFICATION: Increase 0 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 205.91 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.73e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.90726813136231,
      "fos_buckling": 1.1323850623805316,
      "fos_yielding": 1.4159121370443848,
      "deflection": 0.005725090212855996,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.300)"
      },
      "parent_node_id": "node_361",
      "improvement_over_parent": null
    },
    "node_363": {
      "node_id": "node_363",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 249.75 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.73e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.75302057445333,
      "fos_buckling": 1.3350411969100262,
      "fos_yielding": 1.7157185535837616,
      "deflection": 0.004732059818430059,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.230)"
      },
      "parent_node_id": "node_362",
      "improvement_over_parent": null
    },
    "node_364": {
      "node_id": "node_364",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.41 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.40605131789954,
      "fos_buckling": 1.5236096693270456,
      "fos_yielding": 2.013619257152901,
      "deflection": 0.004038231522452144,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_363",
      "improvement_over_parent": null
    },
    "node_365": {
      "node_id": "node_365",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_364",
      "improvement_over_parent": null
    },
    "node_366": {
      "node_id": "node_366",
      "content": "INITIAL DESIGN (Trace 53)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 167.92 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.43e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 167.9168171028803,
      "fos_buckling": 0.7449208118387899,
      "fos_yielding": 0.947208443478586,
      "deflection": 0.007428850261896087,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_367": {
      "node_id": "node_367",
      "content": "MODIFICATION: Increase 6 thickness by 60%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 170.27 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.43e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.2681920821636,
      "fos_buckling": 0.7449208118387899,
      "fos_yielding": 1.4872434890077992,
      "deflection": 0.007428850261896087,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.603)"
      },
      "parent_node_id": "node_366",
      "improvement_over_parent": null
    },
    "node_368": {
      "node_id": "node_368",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 190.38 kg\n  Factor of Safety: 1.06\n  Max Deflection: 6.19e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.38395083232524,
      "fos_buckling": 1.0574880128723914,
      "fos_yielding": 1.3101219211074469,
      "deflection": 0.006186327182719966,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003280)"
      },
      "parent_node_id": "node_367",
      "improvement_over_parent": null
    },
    "node_369": {
      "node_id": "node_369",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 226.29 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.22e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.28859706195854,
      "fos_buckling": 1.2283094867142876,
      "fos_yielding": 1.5559305293282144,
      "deflection": 0.005215645184394956,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.202)"
      },
      "parent_node_id": "node_368",
      "improvement_over_parent": null
    },
    "node_370": {
      "node_id": "node_370",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.29 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2907282958875,
      "fos_buckling": 1.5232041268509706,
      "fos_yielding": 2.0135668534169957,
      "deflection": 0.004039808701646969,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.325)"
      },
      "parent_node_id": "node_369",
      "improvement_over_parent": null
    },
    "node_371": {
      "node_id": "node_371",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_370",
      "improvement_over_parent": null
    },
    "node_372": {
      "node_id": "node_372",
      "content": "INITIAL DESIGN (Trace 54)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 126.85 kg\n  Factor of Safety: 1.33\n  Max Deflection: 5.31e+14 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 126.84833001601649,
      "fos_buckling": 1.3281322897592904,
      "fos_yielding": 0.40979663026328783,
      "deflection": 531443111187719.94,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_373": {
      "node_id": "node_373",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n\nPerformance:\n  Mass: 149.11 kg\n  Factor of Safety: 0.27\n  Max Deflection: 4.16e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.11272405022723,
      "fos_buckling": 0.2695788677032791,
      "fos_yielding": 1.0467607407414632,
      "deflection": 41609309607799.055,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003531)"
      },
      "parent_node_id": "node_372",
      "improvement_over_parent": null
    },
    "node_374": {
      "node_id": "node_374",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n\nPerformance:\n  Mass: 165.61 kg\n  Factor of Safety: 0.38\n  Max Deflection: 2.94e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.60649238813886,
      "fos_buckling": 0.3779874193282366,
      "fos_yielding": 1.2915741594734682,
      "deflection": 0.02937056072867749,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003190)"
      },
      "parent_node_id": "node_373",
      "improvement_over_parent": null
    },
    "node_375": {
      "node_id": "node_375",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n\nPerformance:\n  Mass: 194.83 kg\n  Factor of Safety: 0.74\n  Max Deflection: 8.66e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.82691792952596,
      "fos_buckling": 0.7444811883952269,
      "fos_yielding": 1.557161467527274,
      "deflection": 0.00866469135451611,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004045)"
      },
      "parent_node_id": "node_374",
      "improvement_over_parent": null
    },
    "node_376": {
      "node_id": "node_376",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n\nPerformance:\n  Mass: 198.35 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.3545444556857,
      "fos_buckling": 1.0961390220920688,
      "fos_yielding": 1.364209286666744,
      "deflection": 0.005940522366164669,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002169)"
      },
      "parent_node_id": "node_375",
      "improvement_over_parent": null
    },
    "node_377": {
      "node_id": "node_377",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 245.81 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.81e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.80750428530246,
      "fos_buckling": 1.3173635040132747,
      "fos_yielding": 1.688764956894931,
      "deflection": 0.004806954925331795,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.258)"
      },
      "parent_node_id": "node_376",
      "improvement_over_parent": null
    },
    "node_378": {
      "node_id": "node_378",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2549415968825,
      "fos_buckling": 1.5229942744689002,
      "fos_yielding": 2.01258946779739,
      "deflection": 0.004040311109379114,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.212)"
      },
      "parent_node_id": "node_377",
      "improvement_over_parent": null
    },
    "node_379": {
      "node_id": "node_379",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_378",
      "improvement_over_parent": null
    },
    "node_380": {
      "node_id": "node_380",
      "content": "INITIAL DESIGN (Trace 55)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_381": {
      "node_id": "node_381",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 232.55 kg\n  Factor of Safety: 0.92\n  Max Deflection: 5.86e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.5463879941599,
      "fos_buckling": 0.9225573836696975,
      "fos_yielding": 1.8047976809539932,
      "deflection": 0.005863682204315246,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004784)"
      },
      "parent_node_id": "node_380",
      "improvement_over_parent": null
    },
    "node_382": {
      "node_id": "node_382",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 259.08 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.27e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.08114763710154,
      "fos_buckling": 1.0071674251205638,
      "fos_yielding": 2.0087258061790547,
      "deflection": 0.005270384768790275,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.125)"
      },
      "parent_node_id": "node_381",
      "improvement_over_parent": null
    },
    "node_383": {
      "node_id": "node_383",
      "content": "MODIFICATION: Increase 2 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 262.55 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.54727931574786,
      "fos_buckling": 1.0069282108427984,
      "fos_yielding": 1.9982834763114077,
      "deflection": 0.005234943519566128,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.182)"
      },
      "parent_node_id": "node_382",
      "improvement_over_parent": null
    },
    "node_384": {
      "node_id": "node_384",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 288.44 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.13e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 288.44471645813763,
      "fos_buckling": 1.5210144412295818,
      "fos_yielding": 2.01322304441164,
      "deflection": 0.004131360591983968,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_383",
      "improvement_over_parent": null
    },
    "node_385": {
      "node_id": "node_385",
      "content": "MODIFICATION: Increase 0 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.20491540057594,
      "fos_buckling": 1.5228375885666032,
      "fos_yielding": 2.0122833417581916,
      "deflection": 0.0040410352880926,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.179)"
      },
      "parent_node_id": "node_384",
      "improvement_over_parent": null
    },
    "node_386": {
      "node_id": "node_386",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_385",
      "improvement_over_parent": null
    },
    "node_387": {
      "node_id": "node_387",
      "content": "INITIAL DESIGN (Trace 56)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 194.49 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.32e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.49496210910235,
      "fos_buckling": 0.8773685155263411,
      "fos_yielding": 1.3158432930945616,
      "deflection": 0.00632284336250947,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_388": {
      "node_id": "node_388",
      "content": "MODIFICATION: Increase 5 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 196.58 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.32e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.58431020215545,
      "fos_buckling": 0.8773685155263411,
      "fos_yielding": 1.7631526097144752,
      "deflection": 0.00632284336250947,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.391)"
      },
      "parent_node_id": "node_387",
      "improvement_over_parent": null
    },
    "node_389": {
      "node_id": "node_389",
      "content": "MODIFICATION: Increase 3 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 197.97 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.27e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.97124154020753,
      "fos_buckling": 0.8773685155263415,
      "fos_yielding": 1.7955848997348987,
      "deflection": 0.006266294015329014,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.359)"
      },
      "parent_node_id": "node_388",
      "improvement_over_parent": null
    },
    "node_390": {
      "node_id": "node_390",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 252.71 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.93e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.7060418390842,
      "fos_buckling": 1.0730154155210134,
      "fos_yielding": 2.288587850647541,
      "deflection": 0.004929441766862222,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.302)"
      },
      "parent_node_id": "node_389",
      "improvement_over_parent": null
    },
    "node_391": {
      "node_id": "node_391",
      "content": "MODIFICATION: Increase 8 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.22 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.93e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.21706031435144,
      "fos_buckling": 1.0723160836489307,
      "fos_yielding": 2.2872357331597293,
      "deflection": 0.004932397718511126,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.486)"
      },
      "parent_node_id": "node_390",
      "improvement_over_parent": null
    },
    "node_392": {
      "node_id": "node_392",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 286.60 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.5985322751835,
      "fos_buckling": 1.4501687082120864,
      "fos_yielding": 2.011510777745422,
      "deflection": 0.004113006537090569,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_391",
      "improvement_over_parent": null
    },
    "node_393": {
      "node_id": "node_393",
      "content": "MODIFICATION: Increase 2 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.15 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.15359987264935,
      "fos_buckling": 1.5226286527634358,
      "fos_yielding": 2.0124849338868818,
      "deflection": 0.004041700641591789,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.372)"
      },
      "parent_node_id": "node_392",
      "improvement_over_parent": null
    },
    "node_394": {
      "node_id": "node_394",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_393",
      "improvement_over_parent": null
    },
    "node_395": {
      "node_id": "node_395",
      "content": "INITIAL DESIGN (Trace 57)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 170.27 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.63e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.26594857340157,
      "fos_buckling": 0.738564261526288,
      "fos_yielding": 1.1943356297769971,
      "deflection": 0.007634925976392708,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_396": {
      "node_id": "node_396",
      "content": "MODIFICATION: Increase 3 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 171.97 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.50e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.9659454290551,
      "fos_buckling": 0.7385642615262882,
      "fos_yielding": 1.2546541975267023,
      "deflection": 0.007499804148449052,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.634)"
      },
      "parent_node_id": "node_395",
      "improvement_over_parent": null
    },
    "node_397": {
      "node_id": "node_397",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 190.54 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.78e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.54322024550703,
      "fos_buckling": 0.807699716500943,
      "fos_yielding": 1.3913358197352073,
      "deflection": 0.006776777027517767,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.115)"
      },
      "parent_node_id": "node_396",
      "improvement_over_parent": null
    },
    "node_398": {
      "node_id": "node_398",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 224.47 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.77e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.4673786620954,
      "fos_buckling": 0.9286713294093105,
      "fos_yielding": 1.6416178635942955,
      "deflection": 0.005765278272133194,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_397",
      "improvement_over_parent": null
    },
    "node_399": {
      "node_id": "node_399",
      "content": "MODIFICATION: Increase 5 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 225.68 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.77e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.68032726338916,
      "fos_buckling": 0.9286713294093105,
      "fos_yielding": 1.9199318350057024,
      "deflection": 0.005765278272133194,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.183)"
      },
      "parent_node_id": "node_398",
      "improvement_over_parent": null
    },
    "node_400": {
      "node_id": "node_400",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 246.14 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.80e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.13872723683065,
      "fos_buckling": 1.3188049575308398,
      "fos_yielding": 1.6904885591994216,
      "deflection": 0.004800524942551173,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004017)"
      },
      "parent_node_id": "node_399",
      "improvement_over_parent": null
    },
    "node_401": {
      "node_id": "node_401",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.42 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4225451663807,
      "fos_buckling": 1.5236351413186877,
      "fos_yielding": 2.0131020501551955,
      "deflection": 0.004037998053962483,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.211)"
      },
      "parent_node_id": "node_400",
      "improvement_over_parent": null
    },
    "node_402": {
      "node_id": "node_402",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_401",
      "improvement_over_parent": null
    },
    "node_403": {
      "node_id": "node_403",
      "content": "INITIAL DESIGN (Trace 58)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n\nPerformance:\n  Mass: 143.63 kg\n  Factor of Safety: 0.34\n  Max Deflection: 3.53e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 143.6269402035749,
      "fos_buckling": 0.33866765044652053,
      "fos_yielding": 0.7124062422931384,
      "deflection": 0.03526174896137418,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_404": {
      "node_id": "node_404",
      "content": "MODIFICATION: Increase 5 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n\nPerformance:\n  Mass: 145.32 kg\n  Factor of Safety: 0.34\n  Max Deflection: 3.48e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 145.32058762862485,
      "fos_buckling": 0.33866765044652053,
      "fos_yielding": 0.9805072845682558,
      "deflection": 0.03483996392461045,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.397)"
      },
      "parent_node_id": "node_403",
      "improvement_over_parent": null
    },
    "node_405": {
      "node_id": "node_405",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 173.02 kg\n  Factor of Safety: 0.69\n  Max Deflection: 9.43e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.02153861919192,
      "fos_buckling": 0.6898740044797055,
      "fos_yielding": 1.4310343643715457,
      "deflection": 0.0094283494173305,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003756)"
      },
      "parent_node_id": "node_404",
      "improvement_over_parent": null
    },
    "node_406": {
      "node_id": "node_406",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 213.51 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.65e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.50601588051006,
      "fos_buckling": 0.8290711780475571,
      "fos_yielding": 1.7634666325608224,
      "deflection": 0.0076537660833090075,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.250)"
      },
      "parent_node_id": "node_405",
      "improvement_over_parent": null
    },
    "node_407": {
      "node_id": "node_407",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 250.16 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.54e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.1618793974245,
      "fos_buckling": 0.9479085767775155,
      "fos_yielding": 2.0636392338020646,
      "deflection": 0.006542575944960997,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.186)"
      },
      "parent_node_id": "node_406",
      "improvement_over_parent": null
    },
    "node_408": {
      "node_id": "node_408",
      "content": "MODIFICATION: Increase 8 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 258.54 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.54e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.5382965323349,
      "fos_buckling": 0.948740359469728,
      "fos_yielding": 2.0628212778147788,
      "deflection": 0.006542487222542151,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.468)"
      },
      "parent_node_id": "node_407",
      "improvement_over_parent": null
    },
    "node_409": {
      "node_id": "node_409",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 263.22 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.49e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.2171775000867,
      "fos_buckling": 1.39460018391949,
      "fos_yielding": 1.8079126030193706,
      "deflection": 0.004493406398858365,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002937)"
      },
      "parent_node_id": "node_408",
      "improvement_over_parent": null
    },
    "node_410": {
      "node_id": "node_410",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.40 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.39580240730334,
      "fos_buckling": 1.5235577753984408,
      "fos_yielding": 2.0138230568434254,
      "deflection": 0.004038274508279764,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.126)"
      },
      "parent_node_id": "node_409",
      "improvement_over_parent": null
    },
    "node_411": {
      "node_id": "node_411",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_410",
      "improvement_over_parent": null
    },
    "node_412": {
      "node_id": "node_412",
      "content": "INITIAL DESIGN (Trace 59)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 167.84 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.53e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 167.84257066276297,
      "fos_buckling": 0.73558758925231,
      "fos_yielding": 1.4655437525535695,
      "deflection": 0.007534942706538458,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_413": {
      "node_id": "node_413",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n\nPerformance:\n  Mass: 181.18 kg\n  Factor of Safety: 0.99\n  Max Deflection: 6.43e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.18261845560474,
      "fos_buckling": 0.9926079040434992,
      "fos_yielding": 1.3108389894542423,
      "deflection": 0.006430145607610685,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002134)"
      },
      "parent_node_id": "node_412",
      "improvement_over_parent": null
    },
    "node_414": {
      "node_id": "node_414",
      "content": "MODIFICATION: Increase 9 thickness by 51%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0059)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n\nPerformance:\n  Mass: 194.62 kg\n  Factor of Safety: 1.05\n  Max Deflection: 6.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.6160929183976,
      "fos_buckling": 1.0531425586867396,
      "fos_yielding": 1.3347471254374978,
      "deflection": 0.006014689714148508,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.513)"
      },
      "parent_node_id": "node_413",
      "improvement_over_parent": null
    },
    "node_415": {
      "node_id": "node_415",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0074)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n\nPerformance:\n  Mass: 241.60 kg\n  Factor of Safety: 1.27\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.59587616560347,
      "fos_buckling": 1.2709594841214575,
      "fos_yielding": 1.6569304460970544,
      "deflection": 0.004856838113931358,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.261)"
      },
      "parent_node_id": "node_414",
      "improvement_over_parent": null
    },
    "node_416": {
      "node_id": "node_416",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0095)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 303.06 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.88e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 303.06232442553124,
      "fos_buckling": 1.5347700706228296,
      "fos_yielding": 2.0786050870468507,
      "deflection": 0.0038839504831066126,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.282)"
      },
      "parent_node_id": "node_415",
      "improvement_over_parent": null
    },
    "node_417": {
      "node_id": "node_417",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_416",
      "improvement_over_parent": null
    },
    "node_418": {
      "node_id": "node_418",
      "content": "INITIAL DESIGN (Trace 60)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 187.80 kg\n  Factor of Safety: 0.73\n  Max Deflection: 8.81e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.80317812787777,
      "fos_buckling": 0.7332780557304707,
      "fos_yielding": 1.5317929260715069,
      "deflection": 0.008806118412356961,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_419": {
      "node_id": "node_419",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 219.91 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.53e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.90581500176978,
      "fos_buckling": 0.8409283531970603,
      "fos_yielding": 1.7916342528520104,
      "deflection": 0.0075302169783233635,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.183)"
      },
      "parent_node_id": "node_418",
      "improvement_over_parent": null
    },
    "node_420": {
      "node_id": "node_420",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.33 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.3257439441256,
      "fos_buckling": 1.0356293348722694,
      "fos_yielding": 2.2951529649565914,
      "deflection": 0.005880106596442266,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.311)"
      },
      "parent_node_id": "node_419",
      "improvement_over_parent": null
    },
    "node_421": {
      "node_id": "node_421",
      "content": "MODIFICATION: Increase 7 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 287.96 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.95979374145,
      "fos_buckling": 1.0365374119328656,
      "fos_yielding": 2.2956392846178697,
      "deflection": 0.005880027011568571,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.227)"
      },
      "parent_node_id": "node_420",
      "improvement_over_parent": null
    },
    "node_422": {
      "node_id": "node_422",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.17 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1736237752641,
      "fos_buckling": 1.5227527423284115,
      "fos_yielding": 2.012203986989583,
      "deflection": 0.004041301875944956,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_421",
      "improvement_over_parent": null
    },
    "node_423": {
      "node_id": "node_423",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_422",
      "improvement_over_parent": null
    },
    "node_424": {
      "node_id": "node_424",
      "content": "INITIAL DESIGN (Trace 61)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 204.39 kg\n  Factor of Safety: 0.78\n  Max Deflection: 8.26e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.3857665407685,
      "fos_buckling": 0.7763355179907765,
      "fos_yielding": 1.6331565121901235,
      "deflection": 0.008261961362971105,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_425": {
      "node_id": "node_425",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 245.63 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.88e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.62994552091465,
      "fos_buckling": 0.9088446333717651,
      "fos_yielding": 1.9604206978649867,
      "deflection": 0.006884093524178599,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.218)"
      },
      "parent_node_id": "node_424",
      "improvement_over_parent": null
    },
    "node_426": {
      "node_id": "node_426",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.12 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.1158348475752,
      "fos_buckling": 1.036944049396849,
      "fos_yielding": 2.2967366301854333,
      "deflection": 0.00587722414272396,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.190)"
      },
      "parent_node_id": "node_425",
      "improvement_over_parent": null
    },
    "node_427": {
      "node_id": "node_427",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.33 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.32966488138925,
      "fos_buckling": 1.5233017438443237,
      "fos_yielding": 2.0131804507720252,
      "deflection": 0.004039340752468573,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_426",
      "improvement_over_parent": null
    },
    "node_428": {
      "node_id": "node_428",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_427",
      "improvement_over_parent": null
    },
    "node_429": {
      "node_id": "node_429",
      "content": "INITIAL DESIGN (Trace 62)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 121.23 kg\n  Factor of Safety: 0.41\n  Max Deflection: 1.23e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 121.23171469494943,
      "fos_buckling": 0.40673448849201277,
      "fos_yielding": 1.2562004751100615,
      "deflection": 0.012260721690687237,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_430": {
      "node_id": "node_430",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 146.59 kg\n  Factor of Safety: 0.49\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.59475351872146,
      "fos_buckling": 0.486532617271233,
      "fos_yielding": 1.517840394556294,
      "deflection": 0.010149362435724054,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.221)"
      },
      "parent_node_id": "node_429",
      "improvement_over_parent": null
    },
    "node_431": {
      "node_id": "node_431",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 173.07 kg\n  Factor of Safety: 0.57\n  Max Deflection: 8.61e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.06949409247878,
      "fos_buckling": 0.5678711675897579,
      "fos_yielding": 1.790479514689508,
      "deflection": 0.008605288331570251,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.193)"
      },
      "parent_node_id": "node_430",
      "improvement_over_parent": null
    },
    "node_432": {
      "node_id": "node_432",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 198.85 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.55e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.84954817839505,
      "fos_buckling": 0.875788072372083,
      "fos_yielding": 1.7904795146895087,
      "deflection": 0.006549791126293086,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004129)"
      },
      "parent_node_id": "node_431",
      "improvement_over_parent": null
    },
    "node_433": {
      "node_id": "node_433",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n\nPerformance:\n  Mass: 217.95 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.54e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.94659688359076,
      "fos_buckling": 0.9533663237468355,
      "fos_yielding": 1.579152837406844,
      "deflection": 0.005538176161749045,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003730)"
      },
      "parent_node_id": "node_432",
      "improvement_over_parent": null
    },
    "node_434": {
      "node_id": "node_434",
      "content": "MODIFICATION: Increase 7 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n\nPerformance:\n  Mass: 229.97 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.43e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.97285396457207,
      "fos_buckling": 0.9502848465660495,
      "fos_yielding": 1.5583728863076978,
      "deflection": 0.005432552985769445,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.555)"
      },
      "parent_node_id": "node_433",
      "improvement_over_parent": null
    },
    "node_435": {
      "node_id": "node_435",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0081)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.29 kg\n  Factor of Safety: 1.19\n  Max Deflection: 4.27e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.285662738275,
      "fos_buckling": 1.1859785660841458,
      "fos_yielding": 1.987415493866412,
      "deflection": 0.004265731895354539,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_434",
      "improvement_over_parent": null
    },
    "node_436": {
      "node_id": "node_436",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_435",
      "improvement_over_parent": null
    },
    "node_437": {
      "node_id": "node_437",
      "content": "INITIAL DESIGN (Trace 63)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0013)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0014)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 132.02 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.44e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 132.0197034113801,
      "fos_buckling": 0.5203054776347033,
      "fos_yielding": 0.7687794209023399,
      "deflection": 0.014366504899786489,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_438": {
      "node_id": "node_438",
      "content": "MODIFICATION: Increase 0 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0014)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 136.37 kg\n  Factor of Safety: 0.55\n  Max Deflection: 1.27e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 136.36547836705705,
      "fos_buckling": 0.547979415812871,
      "fos_yielding": 0.748504889995124,
      "deflection": 0.012704693434779217,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.546)"
      },
      "parent_node_id": "node_437",
      "improvement_over_parent": null
    },
    "node_439": {
      "node_id": "node_439",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 173.25 kg\n  Factor of Safety: 0.68\n  Max Deflection: 1.00e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.2546457937294,
      "fos_buckling": 0.6800993724063505,
      "fos_yielding": 0.9536003664860827,
      "deflection": 0.010008244367014621,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.285)"
      },
      "parent_node_id": "node_438",
      "improvement_over_parent": null
    },
    "node_440": {
      "node_id": "node_440",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 215.86 kg\n  Factor of Safety: 0.82\n  Max Deflection: 8.04e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.86272009166646,
      "fos_buckling": 0.8242423474670787,
      "fos_yielding": 1.1921375822876066,
      "deflection": 0.008040563058250419,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.263)"
      },
      "parent_node_id": "node_439",
      "improvement_over_parent": null
    },
    "node_441": {
      "node_id": "node_441",
      "content": "MODIFICATION: Increase 0 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 222.45 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.50e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.44514942233278,
      "fos_buckling": 0.847307355312892,
      "fos_yielding": 1.1761198810852906,
      "deflection": 0.0075020012088211265,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.353)"
      },
      "parent_node_id": "node_440",
      "improvement_over_parent": null
    },
    "node_442": {
      "node_id": "node_442",
      "content": "MODIFICATION: Increase 5 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 225.18 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.50e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.18226503686589,
      "fos_buckling": 0.8441651669959204,
      "fos_yielding": 1.7980960620131057,
      "deflection": 0.007504101355321461,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.580)"
      },
      "parent_node_id": "node_441",
      "improvement_over_parent": null
    },
    "node_443": {
      "node_id": "node_443",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 229.26 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.15e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.2604140553709,
      "fos_buckling": 1.2420157460613181,
      "fos_yielding": 1.5755468794281178,
      "deflection": 0.005148897994576708,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002532)"
      },
      "parent_node_id": "node_442",
      "improvement_over_parent": null
    },
    "node_444": {
      "node_id": "node_444",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 292.97 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.96677126604385,
      "fos_buckling": 1.5218141652808428,
      "fos_yielding": 2.010472393624665,
      "deflection": 0.004044178635178874,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.305)"
      },
      "parent_node_id": "node_443",
      "improvement_over_parent": null
    },
    "node_445": {
      "node_id": "node_445",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_444",
      "improvement_over_parent": null
    },
    "node_446": {
      "node_id": "node_446",
      "content": "INITIAL DESIGN (Trace 64)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 155.96 kg\n  Factor of Safety: 0.75\n  Max Deflection: 6.41e+11 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.95804012418716,
      "fos_buckling": 0.7492004949855078,
      "fos_yielding": 1.3269419941453462,
      "deflection": 641348444498.1412,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_447": {
      "node_id": "node_447",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n\nPerformance:\n  Mass: 159.59 kg\n  Factor of Safety: 0.75\n  Max Deflection: 8.86e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.59271737002288,
      "fos_buckling": 0.7453577141407738,
      "fos_yielding": 1.3269419941453462,
      "deflection": 0.008859810767901299,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002239)"
      },
      "parent_node_id": "node_446",
      "improvement_over_parent": null
    },
    "node_448": {
      "node_id": "node_448",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 190.61 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.43e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.60718752880774,
      "fos_buckling": 0.8675325239288528,
      "fos_yielding": 1.587511811643904,
      "deflection": 0.007433306209277649,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.209)"
      },
      "parent_node_id": "node_447",
      "improvement_over_parent": null
    },
    "node_449": {
      "node_id": "node_449",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 229.08 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.20e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.07812520740774,
      "fos_buckling": 1.009010238679414,
      "fos_yielding": 1.9122248534324662,
      "deflection": 0.006200461363005992,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.221)"
      },
      "parent_node_id": "node_448",
      "improvement_over_parent": null
    },
    "node_450": {
      "node_id": "node_450",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 254.98 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.95e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.9755623497975,
      "fos_buckling": 1.0728136056238284,
      "fos_yielding": 1.9122248534324662,
      "deflection": 0.00495410671093762,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_449",
      "improvement_over_parent": null
    },
    "node_451": {
      "node_id": "node_451",
      "content": "MODIFICATION: Increase 6 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0065)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 261.27 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.90e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 261.2684713278941,
      "fos_buckling": 1.0723510058420187,
      "fos_yielding": 1.9122248534324662,
      "deflection": 0.004900431435613284,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.215)"
      },
      "parent_node_id": "node_450",
      "improvement_over_parent": null
    },
    "node_452": {
      "node_id": "node_452",
      "content": "MODIFICATION: Increase 0 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0065)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 266.88 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.80e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 266.8780459604434,
      "fos_buckling": 1.071938975030921,
      "fos_yielding": 1.9122248534324662,
      "deflection": 0.004804047533535848,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.217)"
      },
      "parent_node_id": "node_451",
      "improvement_over_parent": null
    },
    "node_453": {
      "node_id": "node_453",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0065)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 297.86 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.03e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 297.8565920095198,
      "fos_buckling": 1.417545703295874,
      "fos_yielding": 1.6915928517192371,
      "deflection": 0.004034948563687034,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_452",
      "improvement_over_parent": null
    },
    "node_454": {
      "node_id": "node_454",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_453",
      "improvement_over_parent": null
    },
    "node_455": {
      "node_id": "node_455",
      "content": "INITIAL DESIGN (Trace 65)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_456": {
      "node_id": "node_456",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n\nPerformance:\n  Mass: 159.45 kg\n  Factor of Safety: 0.70\n  Max Deflection: 1.02e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.4533055856933,
      "fos_buckling": 0.6985067775470347,
      "fos_yielding": 1.1765815208375565,
      "deflection": 10221407576560.762,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003653)"
      },
      "parent_node_id": "node_455",
      "improvement_over_parent": null
    },
    "node_457": {
      "node_id": "node_457",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 207.88 kg\n  Factor of Safety: 0.50\n  Max Deflection: 6.49e+12 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.88027950025645,
      "fos_buckling": 0.4955379689310072,
      "fos_yielding": 1.1253073712763755,
      "deflection": 6492522113335.763,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_456",
      "improvement_over_parent": null
    },
    "node_458": {
      "node_id": "node_458",
      "content": "MODIFICATION: Increase 5 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 209.49 kg\n  Factor of Safety: 0.50\n  Max Deflection: 6.49e+12 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.48971537741593,
      "fos_buckling": 0.4955379689310072,
      "fos_yielding": 1.1253073712763755,
      "deflection": 6492522113335.763,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.258)"
      },
      "parent_node_id": "node_457",
      "improvement_over_parent": null
    },
    "node_459": {
      "node_id": "node_459",
      "content": "MODIFICATION: Increase 1 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 215.14 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.49e+12 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.14267644707766,
      "fos_buckling": 0.9910759378620144,
      "fos_yielding": 1.9136392152642672,
      "deflection": 5494998177042.582,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.211)"
      },
      "parent_node_id": "node_458",
      "improvement_over_parent": null
    },
    "node_460": {
      "node_id": "node_460",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 246.12 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.82e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.12122249615402,
      "fos_buckling": 0.5218708892287559,
      "fos_yielding": 1.3152808967126275,
      "deflection": 0.007820161520314579,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_459",
      "improvement_over_parent": null
    },
    "node_461": {
      "node_id": "node_461",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 290.70 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.7031536640999,
      "fos_buckling": 1.4221207041598083,
      "fos_yielding": 1.6972364009225456,
      "deflection": 0.004119010530855328,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_460",
      "improvement_over_parent": null
    },
    "node_462": {
      "node_id": "node_462",
      "content": "MODIFICATION: Increase 6 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0094)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 310.39 kg\n  Factor of Safety: 1.42\n  Max Deflection: 3.89e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 310.38635220934924,
      "fos_buckling": 1.420119780638111,
      "fos_yielding": 1.694848389675291,
      "deflection": 0.00389468481367337,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.529)"
      },
      "parent_node_id": "node_461",
      "improvement_over_parent": null
    },
    "node_463": {
      "node_id": "node_463",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_462",
      "improvement_over_parent": null
    },
    "node_464": {
      "node_id": "node_464",
      "content": "INITIAL DESIGN (Trace 66)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0021)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0017)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 156.29 kg\n  Factor of Safety: 0.22\n  Max Deflection: 1.33e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 156.28685252851426,
      "fos_buckling": 0.22180045549336513,
      "fos_yielding": 1.0116853529493244,
      "deflection": 0.013322977136626855,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_465": {
      "node_id": "node_465",
      "content": "MODIFICATION: Increase 3 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0021)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0021)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 158.21 kg\n  Factor of Safety: 0.26\n  Max Deflection: 1.25e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 158.20506330465884,
      "fos_buckling": 0.2642484916269307,
      "fos_yielding": 1.0793184397959763,
      "deflection": 0.01245461560112708,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.215)"
      },
      "parent_node_id": "node_464",
      "improvement_over_parent": null
    },
    "node_466": {
      "node_id": "node_466",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 188.91 kg\n  Factor of Safety: 0.31\n  Max Deflection: 1.04e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.9067245385821,
      "fos_buckling": 0.3113403235103584,
      "fos_yielding": 1.2867075736284823,
      "deflection": 0.010438886385572292,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.208)"
      },
      "parent_node_id": "node_465",
      "improvement_over_parent": null
    },
    "node_467": {
      "node_id": "node_467",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 231.62 kg\n  Factor of Safety: 0.37\n  Max Deflection: 8.52e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.62234852173762,
      "fos_buckling": 0.3745904926620666,
      "fos_yielding": 1.5740531061558076,
      "deflection": 0.008522741236724267,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.247)"
      },
      "parent_node_id": "node_466",
      "improvement_over_parent": null
    },
    "node_468": {
      "node_id": "node_468",
      "content": "MODIFICATION: Increase 3 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 239.49 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.60e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.49006907789033,
      "fos_buckling": 0.5221873273424211,
      "fos_yielding": 1.5732595158220355,
      "deflection": 0.00760475056087761,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.522)"
      },
      "parent_node_id": "node_467",
      "improvement_over_parent": null
    },
    "node_469": {
      "node_id": "node_469",
      "content": "MODIFICATION: Increase 2 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 248.70 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.6977531274202,
      "fos_buckling": 0.5218575433627988,
      "fos_yielding": 1.572950150111784,
      "deflection": 0.007518076469098216,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.605)"
      },
      "parent_node_id": "node_468",
      "improvement_over_parent": null
    },
    "node_470": {
      "node_id": "node_470",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.28 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2796842953661,
      "fos_buckling": 1.523041823665198,
      "fos_yielding": 2.012813356217718,
      "deflection": 0.00403999167559032,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_469",
      "improvement_over_parent": null
    },
    "node_471": {
      "node_id": "node_471",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_470",
      "improvement_over_parent": null
    },
    "node_472": {
      "node_id": "node_472",
      "content": "INITIAL DESIGN (Trace 67)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_473": {
      "node_id": "node_473",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 267.18 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.90e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.17663069145954,
      "fos_buckling": 1.0721042093965394,
      "fos_yielding": 2.2328869769230715,
      "deflection": 0.0048983488153605,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_472",
      "improvement_over_parent": null
    },
    "node_474": {
      "node_id": "node_474",
      "content": "MODIFICATION: Increase 3 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 268.84 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.83942725118555,
      "fos_buckling": 1.0721042093965396,
      "fos_yielding": 2.287134244823017,
      "deflection": 0.004852882629619643,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.339)"
      },
      "parent_node_id": "node_473",
      "improvement_over_parent": null
    },
    "node_475": {
      "node_id": "node_475",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n\nPerformance:\n  Mass: 287.00 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.0027074154906,
      "fos_buckling": 1.4741067373484669,
      "fos_yielding": 2.0323678541398547,
      "deflection": 0.00410406831341442,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003535)"
      },
      "parent_node_id": "node_474",
      "improvement_over_parent": null
    },
    "node_476": {
      "node_id": "node_476",
      "content": "MODIFICATION: Increase 3 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0053)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n\nPerformance:\n  Mass: 289.32 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.07e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.3207080401551,
      "fos_buckling": 1.472877919474991,
      "fos_yielding": 2.0328648864633645,
      "deflection": 0.004068914172087718,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.376)"
      },
      "parent_node_id": "node_475",
      "improvement_over_parent": null
    },
    "node_477": {
      "node_id": "node_477",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_476",
      "improvement_over_parent": null
    },
    "node_478": {
      "node_id": "node_478",
      "content": "INITIAL DESIGN (Trace 68)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 169.92 kg\n  Factor of Safety: 1.30\n  Max Deflection: 2.10e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.9182246543196,
      "fos_buckling": 1.3043751986521124,
      "fos_yielding": 1.5099955463011967,
      "deflection": 21012136284973.344,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_479": {
      "node_id": "node_479",
      "content": "MODIFICATION: Increase 6 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 171.65 kg\n  Factor of Safety: 1.60\n  Max Deflection: 2.10e+13 m\n  Status: FEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 171.65071772715487,
      "fos_buckling": 1.5992379812981232,
      "fos_yielding": 1.9076761821491073,
      "deflection": 21012136284973.344,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.284)"
      },
      "parent_node_id": "node_478",
      "improvement_over_parent": null
    },
    "node_480": {
      "node_id": "node_480",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 206.17 kg\n  Factor of Safety: 0.37\n  Max Deflection: 5.05e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.17463906822147,
      "fos_buckling": 0.37432561123586855,
      "fos_yielding": 0.6505518131703747,
      "deflection": 50453566507866.766,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.220)"
      },
      "parent_node_id": "node_479",
      "improvement_over_parent": null
    },
    "node_481": {
      "node_id": "node_481",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 237.15 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.51e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.15318511729782,
      "fos_buckling": 0.5222699224268942,
      "fos_yielding": 1.5736416638686124,
      "deflection": 0.007512666019807047,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_480",
      "improvement_over_parent": null
    },
    "node_482": {
      "node_id": "node_482",
      "content": "MODIFICATION: Increase 1 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 248.77 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.7695573232063,
      "fos_buckling": 0.5218538046253002,
      "fos_yielding": 1.5732512751640884,
      "deflection": 0.007517321994782511,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.543)"
      },
      "parent_node_id": "node_481",
      "improvement_over_parent": null
    },
    "node_483": {
      "node_id": "node_483",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.35 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.35148849115217,
      "fos_buckling": 1.5230368712157267,
      "fos_yielding": 2.0131998522168333,
      "deflection": 0.004038990543230317,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_482",
      "improvement_over_parent": null
    },
    "node_484": {
      "node_id": "node_484",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_483",
      "improvement_over_parent": null
    },
    "node_485": {
      "node_id": "node_485",
      "content": "INITIAL DESIGN (Trace 69)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 256.86 kg\n  Factor of Safety: 1.23\n  Max Deflection: 4.60e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.86427306195054,
      "fos_buckling": 1.2317726014434325,
      "fos_yielding": 1.8196986409211473,
      "deflection": 0.004600704918207222,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_486": {
      "node_id": "node_486",
      "content": "MODIFICATION: Increase 4 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 258.56 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.55e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.5644576517328,
      "fos_buckling": 1.2988178672289492,
      "fos_yielding": 1.8203093733143716,
      "deflection": 0.004551302650201568,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.395)"
      },
      "parent_node_id": "node_485",
      "improvement_over_parent": null
    },
    "node_487": {
      "node_id": "node_487",
      "content": "MODIFICATION: Increase 2 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 265.23 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.46e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.2253249130681,
      "fos_buckling": 1.4033501566752478,
      "fos_yielding": 1.8213428297362007,
      "deflection": 0.004460129648466166,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.431)"
      },
      "parent_node_id": "node_486",
      "improvement_over_parent": null
    },
    "node_488": {
      "node_id": "node_488",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2207709319319,
      "fos_buckling": 1.5228070992851754,
      "fos_yielding": 2.0123231602004688,
      "deflection": 0.0040408460774084675,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.116)"
      },
      "parent_node_id": "node_487",
      "improvement_over_parent": null
    },
    "node_489": {
      "node_id": "node_489",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_488",
      "improvement_over_parent": null
    },
    "node_490": {
      "node_id": "node_490",
      "content": "INITIAL DESIGN (Trace 70)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0018)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 150.83 kg\n  Factor of Safety: 0.75\n  Max Deflection: 7.84e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 150.82772075267837,
      "fos_buckling": 0.7466733099367583,
      "fos_yielding": 1.0939143770729514,
      "deflection": 0.007835318990726444,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_491": {
      "node_id": "node_491",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0021)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 173.04 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.84e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.0384705876947,
      "fos_buckling": 0.8473178679659156,
      "fos_yielding": 1.2540087481180624,
      "deflection": 0.006837686729052819,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.155)"
      },
      "parent_node_id": "node_490",
      "improvement_over_parent": null
    },
    "node_492": {
      "node_id": "node_492",
      "content": "MODIFICATION: Increase 10 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0021)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 178.32 kg\n  Factor of Safety: 0.96\n  Max Deflection: 6.56e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.320937963028,
      "fos_buckling": 0.958652079712014,
      "fos_yielding": 1.269260677397062,
      "deflection": 0.00656252707089256,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.248)"
      },
      "parent_node_id": "node_491",
      "improvement_over_parent": null
    },
    "node_493": {
      "node_id": "node_493",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 199.15 kg\n  Factor of Safety: 1.06\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.14717140071153,
      "fos_buckling": 1.0605579593695176,
      "fos_yielding": 1.4166127821587338,
      "deflection": 0.005883460187300468,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.124)"
      },
      "parent_node_id": "node_492",
      "improvement_over_parent": null
    },
    "node_494": {
      "node_id": "node_494",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 248.38 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.73e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.37738263191181,
      "fos_buckling": 1.2931343352785245,
      "fos_yielding": 1.764160730461641,
      "deflection": 0.004731014029519776,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.267)"
      },
      "parent_node_id": "node_493",
      "improvement_over_parent": null
    },
    "node_495": {
      "node_id": "node_495",
      "content": "MODIFICATION: Increase 3 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 254.13 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.12576440702426,
      "fos_buckling": 1.354703956357492,
      "fos_yielding": 1.7455785719932484,
      "deflection": 0.0046518385600788905,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.404)"
      },
      "parent_node_id": "node_494",
      "improvement_over_parent": null
    },
    "node_496": {
      "node_id": "node_496",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.45 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4474646749327,
      "fos_buckling": 1.5239755447106706,
      "fos_yielding": 2.0138933738219804,
      "deflection": 0.004037690701003502,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_495",
      "improvement_over_parent": null
    },
    "node_497": {
      "node_id": "node_497",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_496",
      "improvement_over_parent": null
    },
    "node_498": {
      "node_id": "node_498",
      "content": "INITIAL DESIGN (Trace 71)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 240.22 kg\n  Factor of Safety: 0.93\n  Max Deflection: 7.18e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.22290418895741,
      "fos_buckling": 0.9288154881788182,
      "fos_yielding": 1.0505954749724218,
      "deflection": 0.007183166154230336,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_499": {
      "node_id": "node_499",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 244.77 kg\n  Factor of Safety: 0.83\n  Max Deflection: 5.03e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.77099197360997,
      "fos_buckling": 0.830569331304498,
      "fos_yielding": 0.9293918083671665,
      "deflection": 0.005030679523048964,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002848)"
      },
      "parent_node_id": "node_498",
      "improvement_over_parent": null
    },
    "node_500": {
      "node_id": "node_500",
      "content": "MODIFICATION: Increase 1 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 251.60 kg\n  Factor of Safety: 0.84\n  Max Deflection: 4.82e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.6028893098246,
      "fos_buckling": 0.8426487274262198,
      "fos_yielding": 0.9429084304990215,
      "deflection": 0.004820651605731563,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.311)"
      },
      "parent_node_id": "node_499",
      "improvement_over_parent": null
    },
    "node_501": {
      "node_id": "node_501",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 288.51 kg\n  Factor of Safety: 0.96\n  Max Deflection: 4.21e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.50806391446775,
      "fos_buckling": 0.9600764116060448,
      "fos_yielding": 1.0868492403170575,
      "deflection": 0.004211126623944516,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.161)"
      },
      "parent_node_id": "node_500",
      "improvement_over_parent": null
    },
    "node_502": {
      "node_id": "node_502",
      "content": "MODIFICATION: Increase 6 thickness by 60%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0099)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 310.76 kg\n  Factor of Safety: 0.96\n  Max Deflection: 3.97e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 310.75784961423625,
      "fos_buckling": 0.9588245013766593,
      "fos_yielding": 1.0854320222026401,
      "deflection": 0.003972801275699267,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.603)"
      },
      "parent_node_id": "node_501",
      "improvement_over_parent": null
    },
    "node_503": {
      "node_id": "node_503",
      "content": "MODIFICATION: Increase 6 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0122)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 323.41 kg\n  Factor of Safety: 0.96\n  Max Deflection: 3.89e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 323.4109953389124,
      "fos_buckling": 0.9583434463966337,
      "fos_yielding": 1.0848874465487952,
      "deflection": 0.0038910483777184076,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.239)"
      },
      "parent_node_id": "node_502",
      "improvement_over_parent": null
    },
    "node_504": {
      "node_id": "node_504",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_503",
      "improvement_over_parent": null
    },
    "node_505": {
      "node_id": "node_505",
      "content": "INITIAL DESIGN (Trace 72)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0019)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0019)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0017)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0016)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0013)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0011)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0015)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0012)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0017)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0021)]\n\nPerformance:\n  Mass: 84.54 kg\n  Factor of Safety: 0.24\n  Max Deflection: 2.33e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 84.5354804475845,
      "fos_buckling": 0.23533585912984192,
      "fos_yielding": 0.6797170968639558,
      "deflection": 0.023275364033339855,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_506": {
      "node_id": "node_506",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0022)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0022)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0018)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0017)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0013)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n\nPerformance:\n  Mass: 95.26 kg\n  Factor of Safety: 0.26\n  Max Deflection: 2.07e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 95.26254356131932,
      "fos_buckling": 0.2630563078769235,
      "fos_yielding": 0.7654495453002801,
      "deflection": 0.020659098029354686,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.131)"
      },
      "parent_node_id": "node_505",
      "improvement_over_parent": null
    },
    "node_507": {
      "node_id": "node_507",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0022)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0022)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0018)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0017)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0013)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0023)]\n\nPerformance:\n  Mass: 112.51 kg\n  Factor of Safety: 0.64\n  Max Deflection: 1.03e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 112.5067246515092,
      "fos_buckling": 0.6399928832818385,
      "fos_yielding": 0.8060356081354214,
      "deflection": 0.010324557900622028,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.002330)"
      },
      "parent_node_id": "node_506",
      "improvement_over_parent": null
    },
    "node_508": {
      "node_id": "node_508",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0022)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0015)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n\nPerformance:\n  Mass: 131.14 kg\n  Factor of Safety: 0.74\n  Max Deflection: 8.87e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 131.1408071646624,
      "fos_buckling": 0.7372588517139145,
      "fos_yielding": 0.9389912672877612,
      "deflection": 0.008867298576108755,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.172)"
      },
      "parent_node_id": "node_507",
      "improvement_over_parent": null
    },
    "node_509": {
      "node_id": "node_509",
      "content": "MODIFICATION: Increase 8 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0022)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0015)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n\nPerformance:\n  Mass: 138.60 kg\n  Factor of Safety: 0.74\n  Max Deflection: 8.68e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 138.5989193395165,
      "fos_buckling": 0.7353141138676188,
      "fos_yielding": 0.9264243667437589,
      "deflection": 0.008676208088921245,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.550)"
      },
      "parent_node_id": "node_508",
      "improvement_over_parent": null
    },
    "node_510": {
      "node_id": "node_510",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n\nPerformance:\n  Mass: 179.78 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.70e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.7832757518853,
      "fos_buckling": 0.9311376656757917,
      "fos_yielding": 1.2016408536356677,
      "deflection": 0.006699435980804236,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.314)"
      },
      "parent_node_id": "node_509",
      "improvement_over_parent": null
    },
    "node_511": {
      "node_id": "node_511",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0062)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n\nPerformance:\n  Mass: 233.35 kg\n  Factor of Safety: 1.17\n  Max Deflection: 5.17e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.34902331134828,
      "fos_buckling": 1.1704498703415371,
      "fos_yielding": 1.5597018108139515,
      "deflection": 0.005172029408635127,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.321)"
      },
      "parent_node_id": "node_510",
      "improvement_over_parent": null
    },
    "node_512": {
      "node_id": "node_512",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0081)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 296.50 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 296.4956305061534,
      "fos_buckling": 1.4303773371720545,
      "fos_yielding": 1.9821492478159872,
      "deflection": 0.004079811914171791,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_511",
      "improvement_over_parent": null
    },
    "node_513": {
      "node_id": "node_513",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_512",
      "improvement_over_parent": null
    },
    "node_514": {
      "node_id": "node_514",
      "content": "INITIAL DESIGN (Trace 73)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 198.00 kg\n  Factor of Safety: 0.61\n  Max Deflection: 7.11e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.00419167498248,
      "fos_buckling": 0.6059674968617963,
      "fos_yielding": 1.6167140811221892,
      "deflection": 0.00710945329671615,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_515": {
      "node_id": "node_515",
      "content": "MODIFICATION: Increase 5 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 199.00 kg\n  Factor of Safety: 0.61\n  Max Deflection: 7.09e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.0036505425696,
      "fos_buckling": 0.6058841457491736,
      "fos_yielding": 1.613487405616171,
      "deflection": 0.007092379120575805,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.335)"
      },
      "parent_node_id": "node_514",
      "improvement_over_parent": null
    },
    "node_516": {
      "node_id": "node_516",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 225.54 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.33e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.53820564092962,
      "fos_buckling": 1.0059532303996714,
      "fos_yielding": 1.6267084077673075,
      "deflection": 0.005334199346806641,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004259)"
      },
      "parent_node_id": "node_515",
      "improvement_over_parent": null
    },
    "node_517": {
      "node_id": "node_517",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 279.96 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.31e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 279.96119424859154,
      "fos_buckling": 1.2208949481162399,
      "fos_yielding": 2.0152646329420336,
      "deflection": 0.0043085516370281705,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.264)"
      },
      "parent_node_id": "node_516",
      "improvement_over_parent": null
    },
    "node_518": {
      "node_id": "node_518",
      "content": "MODIFICATION: Increase 7 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.26829774993803,
      "fos_buckling": 1.5229963948047995,
      "fos_yielding": 2.012561737399812,
      "deflection": 0.004040061362156434,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.488)"
      },
      "parent_node_id": "node_517",
      "improvement_over_parent": null
    },
    "node_519": {
      "node_id": "node_519",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_518",
      "improvement_over_parent": null
    },
    "node_520": {
      "node_id": "node_520",
      "content": "INITIAL DESIGN (Trace 74)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n\nPerformance:\n  Mass: 138.74 kg\n  Factor of Safety: 0.73\n  Max Deflection: 8.71e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 138.73870616696001,
      "fos_buckling": 0.7315697558205645,
      "fos_yielding": 1.5295400446262792,
      "deflection": 8709875272576.98,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_521": {
      "node_id": "node_521",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 167.35 kg\n  Factor of Safety: 0.50\n  Max Deflection: 1.30e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 167.3514616410024,
      "fos_buckling": 0.49592189867238906,
      "fos_yielding": 1.1253073712763755,
      "deflection": 12995529855815.31,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.221)"
      },
      "parent_node_id": "node_520",
      "improvement_over_parent": null
    },
    "node_522": {
      "node_id": "node_522",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 203.27 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.22e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.26820541616945,
      "fos_buckling": 0.8979085178301904,
      "fos_yielding": 1.843496361432743,
      "deflection": 0.00621847572127201,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004953)"
      },
      "parent_node_id": "node_521",
      "improvement_over_parent": null
    },
    "node_523": {
      "node_id": "node_523",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 252.31 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.02e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.30898208108547,
      "fos_buckling": 1.0727774271768293,
      "fos_yielding": 2.2858639529701996,
      "deflection": 0.005024993739745383,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.264)"
      },
      "parent_node_id": "node_522",
      "improvement_over_parent": null
    },
    "node_524": {
      "node_id": "node_524",
      "content": "MODIFICATION: Increase 7 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.00 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.002639856063,
      "fos_buckling": 1.0720648144524085,
      "fos_yielding": 2.2858639529701996,
      "deflection": 0.004855513637502459,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.318)"
      },
      "parent_node_id": "node_523",
      "improvement_over_parent": null
    },
    "node_525": {
      "node_id": "node_525",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 292.98 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.9811859051394,
      "fos_buckling": 1.5221942613700137,
      "fos_yielding": 2.0104829804628706,
      "deflection": 0.004044158322652514,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_524",
      "improvement_over_parent": null
    },
    "node_526": {
      "node_id": "node_526",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_525",
      "improvement_over_parent": null
    },
    "node_527": {
      "node_id": "node_527",
      "content": "INITIAL DESIGN (Trace 75)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 225.12 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.24e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.12295596552661,
      "fos_buckling": 1.101523852099386,
      "fos_yielding": 1.5853614204772848,
      "deflection": 0.005244340386224768,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_528": {
      "node_id": "node_528",
      "content": "MODIFICATION: Increase 4 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 226.39 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.3936020152965,
      "fos_buckling": 1.2196176217736174,
      "fos_yielding": 1.5858340452302837,
      "deflection": 0.005191435817190775,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.321)"
      },
      "parent_node_id": "node_527",
      "improvement_over_parent": null
    },
    "node_529": {
      "node_id": "node_529",
      "content": "MODIFICATION: Increase 3 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 229.43 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.15e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.42836312860322,
      "fos_buckling": 1.2427582932663122,
      "fos_yielding": 1.5770046271375884,
      "deflection": 0.005145103536111343,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.203)"
      },
      "parent_node_id": "node_528",
      "improvement_over_parent": null
    },
    "node_530": {
      "node_id": "node_530",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 254.23 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.22660525182476,
      "fos_buckling": 1.354967951671034,
      "fos_yielding": 1.746480260565839,
      "deflection": 0.004649924145080485,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.117)"
      },
      "parent_node_id": "node_529",
      "improvement_over_parent": null
    },
    "node_531": {
      "node_id": "node_531",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.11 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1059012906185,
      "fos_buckling": 1.522351877220551,
      "fos_yielding": 2.011806613444925,
      "deflection": 0.004042233488377841,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.168)"
      },
      "parent_node_id": "node_530",
      "improvement_over_parent": null
    },
    "node_532": {
      "node_id": "node_532",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_531",
      "improvement_over_parent": null
    },
    "node_533": {
      "node_id": "node_533",
      "content": "INITIAL DESIGN (Trace 76)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 135.19 kg\n  Factor of Safety: 1.28\n  Max Deflection: 2.35e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 135.18639401086705,
      "fos_buckling": 1.2814391196564363,
      "fos_yielding": 0.5626536856381877,
      "deflection": 23456103684934.777,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_534": {
      "node_id": "node_534",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 154.02 kg\n  Factor of Safety: 0.26\n  Max Deflection: 1.38e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 154.0208304106218,
      "fos_buckling": 0.2608363213135332,
      "fos_yielding": 0.5626536856381877,
      "deflection": 13831180497796.34,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.148)"
      },
      "parent_node_id": "node_533",
      "improvement_over_parent": null
    },
    "node_535": {
      "node_id": "node_535",
      "content": "MODIFICATION: Increase 4 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 155.01 kg\n  Factor of Safety: 0.51\n  Max Deflection: 2.68e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.01413039875385,
      "fos_buckling": 0.5127375162053949,
      "fos_yielding": 1.3316746071816579,
      "deflection": 26804502013216.3,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.399)"
      },
      "parent_node_id": "node_534",
      "improvement_over_parent": null
    },
    "node_536": {
      "node_id": "node_536",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n\nPerformance:\n  Mass: 185.14 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.21e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.1379452611451,
      "fos_buckling": 0.744274935498347,
      "fos_yielding": 1.1457976897378899,
      "deflection": 0.007213307886722888,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004178)"
      },
      "parent_node_id": "node_535",
      "improvement_over_parent": null
    },
    "node_537": {
      "node_id": "node_537",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n\nPerformance:\n  Mass: 229.50 kg\n  Factor of Safety: 0.89\n  Max Deflection: 5.83e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.49886760928194,
      "fos_buckling": 0.893547896182997,
      "fos_yielding": 1.4230742582495517,
      "deflection": 0.005834618513520017,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.259)"
      },
      "parent_node_id": "node_536",
      "improvement_over_parent": null
    },
    "node_538": {
      "node_id": "node_538",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 265.25 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.06e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.2489568520664,
      "fos_buckling": 1.0058180631369138,
      "fos_yielding": 1.6475347666880031,
      "deflection": 0.005059100367928434,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_537",
      "improvement_over_parent": null
    },
    "node_539": {
      "node_id": "node_539",
      "content": "MODIFICATION: Increase 5 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 267.04 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.04147129041496,
      "fos_buckling": 1.0058180631369136,
      "fos_yielding": 1.9966485797099254,
      "deflection": 0.005013918419246049,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.241)"
      },
      "parent_node_id": "node_538",
      "improvement_over_parent": null
    },
    "node_540": {
      "node_id": "node_540",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 292.94 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.93890843280474,
      "fos_buckling": 1.521614838749993,
      "fos_yielding": 2.0107557979738777,
      "deflection": 0.004044624394445177,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_539",
      "improvement_over_parent": null
    },
    "node_541": {
      "node_id": "node_541",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_540",
      "improvement_over_parent": null
    },
    "node_542": {
      "node_id": "node_542",
      "content": "INITIAL DESIGN (Trace 77)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 147.21 kg\n  Factor of Safety: 0.13\n  Max Deflection: 2.65e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.21106281046127,
      "fos_buckling": 0.13164445434757258,
      "fos_yielding": 0.6400895501121107,
      "deflection": 26493346753351.22,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_543": {
      "node_id": "node_543",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 178.12 kg\n  Factor of Safety: 0.45\n  Max Deflection: 6.67e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.11831600644842,
      "fos_buckling": 0.44956411979623867,
      "fos_yielding": 1.21606467298172,
      "deflection": 66664692847997.04,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.227)"
      },
      "parent_node_id": "node_542",
      "improvement_over_parent": null
    },
    "node_544": {
      "node_id": "node_544",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 207.87 kg\n  Factor of Safety: 0.35\n  Max Deflection: 2.54e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.8744772092139,
      "fos_buckling": 0.35007125524761185,
      "fos_yielding": 1.2117772941433518,
      "deflection": 0.02542755140573193,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004821)"
      },
      "parent_node_id": "node_543",
      "improvement_over_parent": null
    },
    "node_545": {
      "node_id": "node_545",
      "content": "MODIFICATION: Increase 8 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0075)]\n\nPerformance:\n  Mass: 222.10 kg\n  Factor of Safety: 0.35\n  Max Deflection: 2.47e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.09540558518893,
      "fos_buckling": 0.3500712552476118,
      "fos_yielding": 1.2117772941433516,
      "deflection": 0.02467160064474255,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.546)"
      },
      "parent_node_id": "node_544",
      "improvement_over_parent": null
    },
    "node_546": {
      "node_id": "node_546",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0075)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n\nPerformance:\n  Mass: 226.81 kg\n  Factor of Safety: 0.54\n  Max Deflection: 7.58e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.80943902666073,
      "fos_buckling": 0.5420621090196085,
      "fos_yielding": 1.718910835198804,
      "deflection": 0.00758285331642852,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002961)"
      },
      "parent_node_id": "node_545",
      "improvement_over_parent": null
    },
    "node_547": {
      "node_id": "node_547",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0075)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n\nPerformance:\n  Mass: 265.86 kg\n  Factor of Safety: 1.08\n  Max Deflection: 4.72e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.8637534299848,
      "fos_buckling": 1.0811783048552677,
      "fos_yielding": 1.775804977554227,
      "deflection": 0.004715151857906259,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005523)"
      },
      "parent_node_id": "node_546",
      "improvement_over_parent": null
    },
    "node_548": {
      "node_id": "node_548",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0083)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.75 kg\n  Factor of Safety: 1.18\n  Max Deflection: 4.27e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.74821486699784,
      "fos_buckling": 1.183248715068845,
      "fos_yielding": 1.9624232788498097,
      "deflection": 0.004269927373982041,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.116)"
      },
      "parent_node_id": "node_547",
      "improvement_over_parent": null
    },
    "node_549": {
      "node_id": "node_549",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_548",
      "improvement_over_parent": null
    },
    "node_550": {
      "node_id": "node_550",
      "content": "INITIAL DESIGN (Trace 78)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 164.45 kg\n  Factor of Safety: 0.25\n  Max Deflection: 3.43e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 164.4469732262174,
      "fos_buckling": 0.2495292592920881,
      "fos_yielding": 0.5626536856381877,
      "deflection": 34264890554682.086,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_551": {
      "node_id": "node_551",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 188.94 kg\n  Factor of Safety: 0.15\n  Max Deflection: 6.90e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.94472614842576,
      "fos_buckling": 0.1518339432878411,
      "fos_yielding": 0.5275731553346169,
      "deflection": 69002135047504.53,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.161)"
      },
      "parent_node_id": "node_550",
      "improvement_over_parent": null
    },
    "node_552": {
      "node_id": "node_552",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 228.35 kg\n  Factor of Safety: 0.97\n  Max Deflection: 6.12e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.35163614103084,
      "fos_buckling": 0.9701115129048369,
      "fos_yielding": 2.0207454106389138,
      "deflection": 0.006117474979188366,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005475)"
      },
      "parent_node_id": "node_551",
      "improvement_over_parent": null
    },
    "node_553": {
      "node_id": "node_553",
      "content": "MODIFICATION: Increase 1 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 237.49 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.48e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.4857444746174,
      "fos_buckling": 0.9695033308459956,
      "fos_yielding": 2.020745410638913,
      "deflection": 0.005482276186064667,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.453)"
      },
      "parent_node_id": "node_552",
      "improvement_over_parent": null
    },
    "node_554": {
      "node_id": "node_554",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.61 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.61307005024423,
      "fos_buckling": 1.0719375783172231,
      "fos_yielding": 2.2849354776455977,
      "deflection": 0.004856445972767701,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_553",
      "improvement_over_parent": null
    },
    "node_555": {
      "node_id": "node_555",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 292.99 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.9945420110763,
      "fos_buckling": 1.5225962363709318,
      "fos_yielding": 2.0105290640383333,
      "deflection": 0.0040439004091663774,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_554",
      "improvement_over_parent": null
    },
    "node_556": {
      "node_id": "node_556",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_555",
      "improvement_over_parent": null
    },
    "node_557": {
      "node_id": "node_557",
      "content": "INITIAL DESIGN (Trace 79)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 204.20 kg\n  Factor of Safety: 0.51\n  Max Deflection: 8.59e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.19737643148906,
      "fos_buckling": 0.51077698990841,
      "fos_yielding": 1.6028822571110128,
      "deflection": 0.008591804374502856,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_558": {
      "node_id": "node_558",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n\nPerformance:\n  Mass: 240.54 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.87e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.54262480272052,
      "fos_buckling": 1.2771696941232191,
      "fos_yielding": 1.7125459459622778,
      "deflection": 0.0048683665901411745,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005109)"
      },
      "parent_node_id": "node_557",
      "improvement_over_parent": null
    },
    "node_559": {
      "node_id": "node_559",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 286.19 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.1913595077252,
      "fos_buckling": 1.4735115067118196,
      "fos_yielding": 2.034580185897735,
      "deflection": 0.004103107359947202,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.208)"
      },
      "parent_node_id": "node_558",
      "improvement_over_parent": null
    },
    "node_560": {
      "node_id": "node_560",
      "content": "MODIFICATION: Increase 9 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0084)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 299.32 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.92e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 299.321122211446,
      "fos_buckling": 1.5333342395915237,
      "fos_yielding": 2.061095259499065,
      "deflection": 0.003924371953572755,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.335)"
      },
      "parent_node_id": "node_559",
      "improvement_over_parent": null
    },
    "node_561": {
      "node_id": "node_561",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_560",
      "improvement_over_parent": null
    },
    "node_562": {
      "node_id": "node_562",
      "content": "INITIAL DESIGN (Trace 80)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_563": {
      "node_id": "node_563",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n\nPerformance:\n  Mass: 194.54 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.27e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.54105278873564,
      "fos_buckling": 0.87280071594537,
      "fos_yielding": 1.7840665547462875,
      "deflection": 0.006270473048004451,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002473)"
      },
      "parent_node_id": "node_562",
      "improvement_over_parent": null
    },
    "node_564": {
      "node_id": "node_564",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n\nPerformance:\n  Mass: 224.56 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.44e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.56080738708866,
      "fos_buckling": 0.9841558265055849,
      "fos_yielding": 2.057994525544651,
      "deflection": 0.005444322022836736,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.167)"
      },
      "parent_node_id": "node_563",
      "improvement_over_parent": null
    },
    "node_565": {
      "node_id": "node_565",
      "content": "MODIFICATION: Increase 3 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0051)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n\nPerformance:\n  Mass: 227.34 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.40e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.3423479922362,
      "fos_buckling": 0.9841558265055849,
      "fos_yielding": 2.057994525544651,
      "deflection": 0.005396555309386327,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.499)"
      },
      "parent_node_id": "node_564",
      "improvement_over_parent": null
    },
    "node_566": {
      "node_id": "node_566",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0051)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 255.19 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.59e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.18573741738294,
      "fos_buckling": 1.2885656719887961,
      "fos_yielding": 1.8334367056721455,
      "deflection": 0.004588899557825987,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004647)"
      },
      "parent_node_id": "node_565",
      "improvement_over_parent": null
    },
    "node_567": {
      "node_id": "node_567",
      "content": "MODIFICATION: Increase 2 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0051)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 259.43 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.53e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.42784271225764,
      "fos_buckling": 1.2923910848748663,
      "fos_yielding": 1.8340206741462421,
      "deflection": 0.004531790277634125,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.242)"
      },
      "parent_node_id": "node_566",
      "improvement_over_parent": null
    },
    "node_568": {
      "node_id": "node_568",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0058)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 288.70 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.7022192139215,
      "fos_buckling": 1.4204699605052518,
      "fos_yielding": 2.0394760297347205,
      "deflection": 0.00407893563830229,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.124)"
      },
      "parent_node_id": "node_567",
      "improvement_over_parent": null
    },
    "node_569": {
      "node_id": "node_569",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_568",
      "improvement_over_parent": null
    },
    "node_570": {
      "node_id": "node_570",
      "content": "INITIAL DESIGN (Trace 81)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n\nPerformance:\n  Mass: 135.43 kg\n  Factor of Safety: 0.79\n  Max Deflection: 1.62e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 135.43210393600276,
      "fos_buckling": 0.7928246477172772,
      "fos_yielding": 1.2911031627937621,
      "deflection": 16229878559460.32,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_571": {
      "node_id": "node_571",
      "content": "MODIFICATION: Increase 5 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n\nPerformance:\n  Mass: 136.70 kg\n  Factor of Safety: 0.27\n  Max Deflection: 4.56e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 136.69731070344704,
      "fos_buckling": 0.27180323568804043,
      "fos_yielding": 1.2160646729817197,
      "deflection": 45563962136361.27,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.664)"
      },
      "parent_node_id": "node_570",
      "improvement_over_parent": null
    },
    "node_572": {
      "node_id": "node_572",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 171.24 kg\n  Factor of Safety: 0.18\n  Max Deflection: 2.80e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.23668262333786,
      "fos_buckling": 0.17825831144998208,
      "fos_yielding": 0.6572912921928787,
      "deflection": 28028607328702.965,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.271)"
      },
      "parent_node_id": "node_571",
      "improvement_over_parent": null
    },
    "node_573": {
      "node_id": "node_573",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 217.57 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.21e+12 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.56725039224844,
      "fos_buckling": 0.8724694798536098,
      "fos_yielding": 2.250614742552751,
      "deflection": 6208329238814.644,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.297)"
      },
      "parent_node_id": "node_572",
      "improvement_over_parent": null
    },
    "node_574": {
      "node_id": "node_574",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.15 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.14918156019434,
      "fos_buckling": 1.0726168674310272,
      "fos_yielding": 2.2870378104289064,
      "deflection": 0.004852780599649053,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_573",
      "improvement_over_parent": null
    },
    "node_575": {
      "node_id": "node_575",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1277276092707,
      "fos_buckling": 1.5228632806439013,
      "fos_yielding": 2.0115559850319475,
      "deflection": 0.004042026059733543,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_574",
      "improvement_over_parent": null
    },
    "node_576": {
      "node_id": "node_576",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_575",
      "improvement_over_parent": null
    },
    "node_577": {
      "node_id": "node_577",
      "content": "INITIAL DESIGN (Trace 82)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 207.69 kg\n  Factor of Safety: 0.41\n  Max Deflection: 9.24e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.68770683711597,
      "fos_buckling": 0.4138807507603033,
      "fos_yielding": 1.862089858266668,
      "deflection": 0.009237536534964948,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_578": {
      "node_id": "node_578",
      "content": "MODIFICATION: Increase 1 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 216.87 kg\n  Factor of Safety: 0.41\n  Max Deflection: 8.77e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.8661196056867,
      "fos_buckling": 0.4136196279659538,
      "fos_yielding": 1.8609150413508602,
      "deflection": 0.008765337804774608,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.389)"
      },
      "parent_node_id": "node_577",
      "improvement_over_parent": null
    },
    "node_579": {
      "node_id": "node_579",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 260.06 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.97e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.0641775431389,
      "fos_buckling": 1.072749107557786,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.004966896647685655,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_578",
      "improvement_over_parent": null
    },
    "node_580": {
      "node_id": "node_580",
      "content": "MODIFICATION: Increase 2 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 268.84 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.8375895587448,
      "fos_buckling": 1.0721044635869514,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.004852881781665887,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.562)"
      },
      "parent_node_id": "node_579",
      "improvement_over_parent": null
    },
    "node_581": {
      "node_id": "node_581",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.21906151957694,
      "fos_buckling": 1.5228826845506644,
      "fos_yielding": 2.012442336299257,
      "deflection": 0.004040742753725123,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_580",
      "improvement_over_parent": null
    },
    "node_582": {
      "node_id": "node_582",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_581",
      "improvement_over_parent": null
    },
    "node_583": {
      "node_id": "node_583",
      "content": "INITIAL DESIGN (Trace 83)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_584": {
      "node_id": "node_584",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 172.54 kg\n  Factor of Safety: 0.63\n  Max Deflection: 4.27e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.53752409694485,
      "fos_buckling": 0.6330461973195946,
      "fos_yielding": 0.3595189046839191,
      "deflection": 42717652232240.53,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_583",
      "improvement_over_parent": null
    },
    "node_585": {
      "node_id": "node_585",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 217.12 kg\n  Factor of Safety: 1.39\n  Max Deflection: 1.13e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.11945526489075,
      "fos_buckling": 1.3944786250886616,
      "fos_yielding": 1.8386562587421529,
      "deflection": 11305886300185.336,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_584",
      "improvement_over_parent": null
    },
    "node_586": {
      "node_id": "node_586",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 260.32 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.317513202343,
      "fos_buckling": 1.007185884277328,
      "fos_yielding": 1.9986602651239656,
      "deflection": 0.0050069688319831105,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_585",
      "improvement_over_parent": null
    },
    "node_587": {
      "node_id": "node_587",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.23004983396,
      "fos_buckling": 1.522892768689085,
      "fos_yielding": 2.0124494362925933,
      "deflection": 0.004040637184682526,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_586",
      "improvement_over_parent": null
    },
    "node_588": {
      "node_id": "node_588",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_587",
      "improvement_over_parent": null
    },
    "node_589": {
      "node_id": "node_589",
      "content": "INITIAL DESIGN (Trace 84)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 174.78 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.77e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.77940571378204,
      "fos_buckling": 0.893628551090734,
      "fos_yielding": 1.2317733120632433,
      "deflection": 0.006771799186092255,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_590": {
      "node_id": "node_590",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 224.10 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.30e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.09791638568515,
      "fos_buckling": 1.1165390269570505,
      "fos_yielding": 1.57701674816428,
      "deflection": 0.005295951472185496,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.302)"
      },
      "parent_node_id": "node_589",
      "improvement_over_parent": null
    },
    "node_591": {
      "node_id": "node_591",
      "content": "MODIFICATION: Increase 7 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 229.32 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.15e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.3185171161623,
      "fos_buckling": 1.2422782737709357,
      "fos_yielding": 1.5761106683905075,
      "deflection": 0.005147651093549435,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.196)"
      },
      "parent_node_id": "node_590",
      "improvement_over_parent": null
    },
    "node_592": {
      "node_id": "node_592",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.04 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0392100962717,
      "fos_buckling": 1.5221099910943756,
      "fos_yielding": 2.0111735783530476,
      "deflection": 0.00404322642566712,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.305)"
      },
      "parent_node_id": "node_591",
      "improvement_over_parent": null
    },
    "node_593": {
      "node_id": "node_593",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_592",
      "improvement_over_parent": null
    },
    "node_594": {
      "node_id": "node_594",
      "content": "INITIAL DESIGN (Trace 85)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 223.32 kg\n  Factor of Safety: 0.83\n  Max Deflection: 5.49e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.32188731297003,
      "fos_buckling": 0.8315779705520893,
      "fos_yielding": 1.2329871109142194,
      "deflection": 0.0054856105671981115,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_595": {
      "node_id": "node_595",
      "content": "MODIFICATION: Increase 7 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 232.53 kg\n  Factor of Safety: 0.86\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.53485959416224,
      "fos_buckling": 0.8647401194986045,
      "fos_yielding": 1.2316251586562459,
      "deflection": 0.005193029286460301,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.385)"
      },
      "parent_node_id": "node_594",
      "improvement_over_parent": null
    },
    "node_596": {
      "node_id": "node_596",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 287.47 kg\n  Factor of Safety: 1.06\n  Max Deflection: 4.21e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.4656301904953,
      "fos_buckling": 1.0551019627514788,
      "fos_yielding": 1.5279126923880928,
      "deflection": 0.004211836840963419,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.259)"
      },
      "parent_node_id": "node_595",
      "improvement_over_parent": null
    },
    "node_597": {
      "node_id": "node_597",
      "content": "MODIFICATION: Increase 4 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.67 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.6699582496374,
      "fos_buckling": 1.2995028135770508,
      "fos_yielding": 1.528544696497975,
      "deflection": 0.004156684891786475,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.323)"
      },
      "parent_node_id": "node_596",
      "improvement_over_parent": null
    },
    "node_598": {
      "node_id": "node_598",
      "content": "MODIFICATION: Increase 4 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 290.54 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.5353490390829,
      "fos_buckling": 1.2999874671407807,
      "fos_yielding": 1.5291147719350873,
      "deflection": 0.004106976267142175,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.395)"
      },
      "parent_node_id": "node_597",
      "improvement_over_parent": null
    },
    "node_599": {
      "node_id": "node_599",
      "content": "MODIFICATION: Increase 6 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.99 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.99015862636145,
      "fos_buckling": 1.5218305544037698,
      "fos_yielding": 2.010574506057163,
      "deflection": 0.004043846154500092,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.359)"
      },
      "parent_node_id": "node_598",
      "improvement_over_parent": null
    },
    "node_600": {
      "node_id": "node_600",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_599",
      "improvement_over_parent": null
    },
    "node_601": {
      "node_id": "node_601",
      "content": "INITIAL DESIGN (Trace 86)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_602": {
      "node_id": "node_602",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n\nPerformance:\n  Mass: 154.27 kg\n  Factor of Safety: 0.67\n  Max Deflection: 8.74e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 154.27347319249404,
      "fos_buckling": 0.6742665245666887,
      "fos_yielding": 1.2558598729103687,
      "deflection": 0.008743650200552499,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003011)"
      },
      "parent_node_id": "node_601",
      "improvement_over_parent": null
    },
    "node_603": {
      "node_id": "node_603",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n\nPerformance:\n  Mass: 180.82 kg\n  Factor of Safety: 0.77\n  Max Deflection: 7.47e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.8209984843594,
      "fos_buckling": 0.7743693899786412,
      "fos_yielding": 1.4703394238403285,
      "deflection": 0.007468735797152392,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.183)"
      },
      "parent_node_id": "node_602",
      "improvement_over_parent": null
    },
    "node_604": {
      "node_id": "node_604",
      "content": "MODIFICATION: Increase 3 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n\nPerformance:\n  Mass: 181.98 kg\n  Factor of Safety: 0.77\n  Max Deflection: 7.47e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.9768581010536,
      "fos_buckling": 0.7743693899786412,
      "fos_yielding": 1.4703394238403285,
      "deflection": 0.007468735797152392,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.244)"
      },
      "parent_node_id": "node_603",
      "improvement_over_parent": null
    },
    "node_605": {
      "node_id": "node_605",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 203.34 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.69e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.3358476919105,
      "fos_buckling": 0.8511413475857941,
      "fos_yielding": 1.6415609198074683,
      "deflection": 0.0066899107132954915,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.126)"
      },
      "parent_node_id": "node_604",
      "improvement_over_parent": null
    },
    "node_606": {
      "node_id": "node_606",
      "content": "MODIFICATION: Increase 0 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 209.67 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.19e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.66839966746517,
      "fos_buckling": 0.8507706923537856,
      "fos_yielding": 1.6414306657074809,
      "deflection": 0.006186897296504151,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.319)"
      },
      "parent_node_id": "node_605",
      "improvement_over_parent": null
    },
    "node_607": {
      "node_id": "node_607",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 236.47 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.97e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.47487684727253,
      "fos_buckling": 1.256878077085159,
      "fos_yielding": 1.652636646618254,
      "deflection": 0.004965888025919208,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004306)"
      },
      "parent_node_id": "node_606",
      "improvement_over_parent": null
    },
    "node_608": {
      "node_id": "node_608",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0048)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 290.35 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.3477213662549,
      "fos_buckling": 1.4891886242335493,
      "fos_yielding": 2.0263005318197393,
      "deflection": 0.004057333726978853,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.250)"
      },
      "parent_node_id": "node_607",
      "improvement_over_parent": null
    },
    "node_609": {
      "node_id": "node_609",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_608",
      "improvement_over_parent": null
    },
    "node_610": {
      "node_id": "node_610",
      "content": "INITIAL DESIGN (Trace 87)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 204.41 kg\n  Factor of Safety: 1.15\n  Max Deflection: 5.86e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.40521202969873,
      "fos_buckling": 1.152511833561691,
      "fos_yielding": 1.450706173209677,
      "deflection": 0.005857714513047303,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_611": {
      "node_id": "node_611",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 240.83 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.98e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.82719181940516,
      "fos_buckling": 1.3249796226806303,
      "fos_yielding": 1.7072445136142118,
      "deflection": 0.004981113921118379,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_610",
      "improvement_over_parent": null
    },
    "node_612": {
      "node_id": "node_612",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 284.57 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.22e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 284.5688359996147,
      "fos_buckling": 1.5192017349834188,
      "fos_yielding": 2.0145202583340747,
      "deflection": 0.004224846822055847,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.199)"
      },
      "parent_node_id": "node_611",
      "improvement_over_parent": null
    },
    "node_613": {
      "node_id": "node_613",
      "content": "MODIFICATION: Increase 0 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2606330002496,
      "fos_buckling": 1.5230023095075986,
      "fos_yielding": 2.0126261295771917,
      "deflection": 0.004040199130668078,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.377)"
      },
      "parent_node_id": "node_612",
      "improvement_over_parent": null
    },
    "node_614": {
      "node_id": "node_614",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_613",
      "improvement_over_parent": null
    },
    "node_615": {
      "node_id": "node_615",
      "content": "INITIAL DESIGN (Trace 88)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 226.18 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.22e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.17623676376405,
      "fos_buckling": 1.1788305368477683,
      "fos_yielding": 1.6367970610452802,
      "deflection": 0.005219365915396191,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_616": {
      "node_id": "node_616",
      "content": "MODIFICATION: Increase 8 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 236.14 kg\n  Factor of Safety: 1.17\n  Max Deflection: 5.06e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.14107003477966,
      "fos_buckling": 1.1746453200914617,
      "fos_yielding": 1.6387891599970323,
      "deflection": 0.0050636223120612426,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.642)"
      },
      "parent_node_id": "node_615",
      "improvement_over_parent": null
    },
    "node_617": {
      "node_id": "node_617",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 291.65 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.65265497339743,
      "fos_buckling": 1.4250827310754215,
      "fos_yielding": 2.021137608126617,
      "deflection": 0.00411159874877294,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.258)"
      },
      "parent_node_id": "node_616",
      "improvement_over_parent": null
    },
    "node_618": {
      "node_id": "node_618",
      "content": "MODIFICATION: Increase 5 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.10 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.09981473464575,
      "fos_buckling": 1.5223376918986404,
      "fos_yielding": 2.0116223496284937,
      "deflection": 0.004042468994591299,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.422)"
      },
      "parent_node_id": "node_617",
      "improvement_over_parent": null
    },
    "node_619": {
      "node_id": "node_619",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_618",
      "improvement_over_parent": null
    },
    "node_620": {
      "node_id": "node_620",
      "content": "INITIAL DESIGN (Trace 89)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 181.85 kg\n  Factor of Safety: 0.51\n  Max Deflection: 9.51e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.84839103246205,
      "fos_buckling": 0.5085021730642605,
      "fos_yielding": 1.5934914574068906,
      "deflection": 0.009510340211719408,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_621": {
      "node_id": "node_621",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n\nPerformance:\n  Mass: 217.94 kg\n  Factor of Safety: 1.20\n  Max Deflection: 5.55e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.93661316473268,
      "fos_buckling": 1.2012761228984952,
      "fos_yielding": 1.6372956965451853,
      "deflection": 0.005546414377879122,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005070)"
      },
      "parent_node_id": "node_620",
      "improvement_over_parent": null
    },
    "node_622": {
      "node_id": "node_622",
      "content": "MODIFICATION: Increase 0 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n\nPerformance:\n  Mass: 225.41 kg\n  Factor of Safety: 1.20\n  Max Deflection: 5.30e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.40562117981628,
      "fos_buckling": 1.2044371133311735,
      "fos_yielding": 1.6359195904503392,
      "deflection": 0.005301887543258169,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.385)"
      },
      "parent_node_id": "node_621",
      "improvement_over_parent": null
    },
    "node_623": {
      "node_id": "node_623",
      "content": "MODIFICATION: Increase 8 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0051)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n\nPerformance:\n  Mass: 230.03 kg\n  Factor of Safety: 1.17\n  Max Deflection: 5.24e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.03254961749076,
      "fos_buckling": 1.166284932350522,
      "fos_yielding": 1.6258036691834123,
      "deflection": 0.00523669362041818,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.196)"
      },
      "parent_node_id": "node_622",
      "improvement_over_parent": null
    },
    "node_624": {
      "node_id": "node_624",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0062)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 275.69 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.38e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 275.68809737812774,
      "fos_buckling": 1.356656487288557,
      "fos_yielding": 1.9458992043842227,
      "deflection": 0.004379128137438516,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.217)"
      },
      "parent_node_id": "node_623",
      "improvement_over_parent": null
    },
    "node_625": {
      "node_id": "node_625",
      "content": "MODIFICATION: Increase 10 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0062)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0079)]\n\nPerformance:\n  Mass: 286.23 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.24e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.23182578781365,
      "fos_buckling": 1.3506107028219019,
      "fos_yielding": 1.9446100000848094,
      "deflection": 0.004236411038328839,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.276)"
      },
      "parent_node_id": "node_624",
      "improvement_over_parent": null
    },
    "node_626": {
      "node_id": "node_626",
      "content": "MODIFICATION: Increase 1 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0062)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0079)]\n\nPerformance:\n  Mass: 295.42 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 295.4179530459905,
      "fos_buckling": 1.3601317389817684,
      "fos_yielding": 1.9731457961946794,
      "deflection": 0.00406364383541498,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.389)"
      },
      "parent_node_id": "node_625",
      "improvement_over_parent": null
    },
    "node_627": {
      "node_id": "node_627",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_626",
      "improvement_over_parent": null
    },
    "node_628": {
      "node_id": "node_628",
      "content": "INITIAL DESIGN (Trace 90)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0013)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0016)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 133.62 kg\n  Factor of Safety: 0.56\n  Max Deflection: 1.20e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 133.6229604542929,
      "fos_buckling": 0.5589210686445809,
      "fos_yielding": 0.7012485214727758,
      "deflection": 0.011955477072884496,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_629": {
      "node_id": "node_629",
      "content": "MODIFICATION: Increase 5 thickness by 65%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0016)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 135.49 kg\n  Factor of Safety: 0.56\n  Max Deflection: 1.20e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 135.49115378245307,
      "fos_buckling": 0.5556458210072722,
      "fos_yielding": 1.1270304480165756,
      "deflection": 0.011959055529718569,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.647)"
      },
      "parent_node_id": "node_628",
      "improvement_over_parent": null
    },
    "node_630": {
      "node_id": "node_630",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0019)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 157.46 kg\n  Factor of Safety: 0.64\n  Max Deflection: 1.03e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.464834959427,
      "fos_buckling": 0.6366784154880657,
      "fos_yielding": 1.3087232761857253,
      "deflection": 0.010300022223421404,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_629",
      "improvement_over_parent": null
    },
    "node_631": {
      "node_id": "node_631",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 183.37 kg\n  Factor of Safety: 0.73\n  Max Deflection: 8.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.37372288034382,
      "fos_buckling": 0.7289951010540199,
      "fos_yielding": 1.5225575466700867,
      "deflection": 0.00885472855761819,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.174)"
      },
      "parent_node_id": "node_630",
      "improvement_over_parent": null
    },
    "node_632": {
      "node_id": "node_632",
      "content": "MODIFICATION: Increase 7 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 190.61 kg\n  Factor of Safety: 0.73\n  Max Deflection: 8.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.60993611057074,
      "fos_buckling": 0.7303248012746618,
      "fos_yielding": 1.5234399452043095,
      "deflection": 0.008854479266405386,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.527)"
      },
      "parent_node_id": "node_631",
      "improvement_over_parent": null
    },
    "node_633": {
      "node_id": "node_633",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 231.76 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.29e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.75757394872528,
      "fos_buckling": 0.8652230546242358,
      "fos_yielding": 1.8501482688416866,
      "deflection": 0.0072923617225261065,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.232)"
      },
      "parent_node_id": "node_632",
      "improvement_over_parent": null
    },
    "node_634": {
      "node_id": "node_634",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.11 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.11485487250553,
      "fos_buckling": 1.0369962749765407,
      "fos_yielding": 2.2963845732321007,
      "deflection": 0.005876898585198564,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.267)"
      },
      "parent_node_id": "node_633",
      "improvement_over_parent": null
    },
    "node_635": {
      "node_id": "node_635",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.33 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3286849063196,
      "fos_buckling": 1.5233401539933717,
      "fos_yielding": 2.0128784553513386,
      "deflection": 0.004039289903890755,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_634",
      "improvement_over_parent": null
    },
    "node_636": {
      "node_id": "node_636",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_635",
      "improvement_over_parent": null
    },
    "node_637": {
      "node_id": "node_637",
      "content": "INITIAL DESIGN (Trace 91)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 204.68 kg\n  Factor of Safety: 0.47\n  Max Deflection: 8.84e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.67712787134204,
      "fos_buckling": 0.4718140185831572,
      "fos_yielding": 1.3909301511340146,
      "deflection": 0.008841050345607775,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_638": {
      "node_id": "node_638",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 244.06 kg\n  Factor of Safety: 1.10\n  Max Deflection: 4.89e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.0575072583897,
      "fos_buckling": 1.09846127634635,
      "fos_yielding": 1.7805347470017943,
      "deflection": 0.004892074317168127,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005471)"
      },
      "parent_node_id": "node_637",
      "improvement_over_parent": null
    },
    "node_639": {
      "node_id": "node_639",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 276.43 kg\n  Factor of Safety: 1.23\n  Max Deflection: 4.33e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 276.43294599422427,
      "fos_buckling": 1.2262436729306412,
      "fos_yielding": 2.013983263903334,
      "deflection": 0.0043261843814938325,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.145)"
      },
      "parent_node_id": "node_638",
      "improvement_over_parent": null
    },
    "node_640": {
      "node_id": "node_640",
      "content": "MODIFICATION: Increase 8 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 281.61 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.27e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.61129171054677,
      "fos_buckling": 1.2615326393141542,
      "fos_yielding": 2.014621389028091,
      "deflection": 0.004266058910830209,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.205)"
      },
      "parent_node_id": "node_639",
      "improvement_over_parent": null
    },
    "node_641": {
      "node_id": "node_641",
      "content": "MODIFICATION: Increase 7 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2387394696448,
      "fos_buckling": 1.5227914193191638,
      "fos_yielding": 2.0123416037593924,
      "deflection": 0.004040588117205436,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.404)"
      },
      "parent_node_id": "node_640",
      "improvement_over_parent": null
    },
    "node_642": {
      "node_id": "node_642",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_641",
      "improvement_over_parent": null
    },
    "node_643": {
      "node_id": "node_643",
      "content": "INITIAL DESIGN (Trace 92)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 205.10 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.32e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.0993536191003,
      "fos_buckling": 0.8764892269944184,
      "fos_yielding": 1.7930234571787589,
      "deflection": 0.0063199819007087035,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_644": {
      "node_id": "node_644",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n\nPerformance:\n  Mass: 224.21 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.30e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.20594251237085,
      "fos_buckling": 1.1103839983557091,
      "fos_yielding": 1.5800279803498818,
      "deflection": 0.0052963907059965796,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003732)"
      },
      "parent_node_id": "node_643",
      "improvement_over_parent": null
    },
    "node_645": {
      "node_id": "node_645",
      "content": "MODIFICATION: Increase 7 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n\nPerformance:\n  Mass: 229.20 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.19665736557184,
      "fos_buckling": 1.1398621307770165,
      "fos_yielding": 1.5804889974031993,
      "deflection": 0.0052310820276296926,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.211)"
      },
      "parent_node_id": "node_644",
      "improvement_over_parent": null
    },
    "node_646": {
      "node_id": "node_646",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0065)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 292.62 kg\n  Factor of Safety: 1.41\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.6159176429758,
      "fos_buckling": 1.4077100762974775,
      "fos_yielding": 2.0152248773395662,
      "deflection": 0.004110326944750874,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_645",
      "improvement_over_parent": null
    },
    "node_647": {
      "node_id": "node_647",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_646",
      "improvement_over_parent": null
    },
    "node_648": {
      "node_id": "node_648",
      "content": "INITIAL DESIGN (Trace 93)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 181.14 kg\n  Factor of Safety: 0.79\n  Max Deflection: 6.99e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.1373689919776,
      "fos_buckling": 0.786350064987877,
      "fos_yielding": 1.581458098813411,
      "deflection": 0.006987790906534407,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_649": {
      "node_id": "node_649",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 202.53 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.82e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 202.53433913600765,
      "fos_buckling": 1.1162645737798502,
      "fos_yielding": 1.3928797942918916,
      "deflection": 0.0058193072285827015,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003502)"
      },
      "parent_node_id": "node_648",
      "improvement_over_parent": null
    },
    "node_650": {
      "node_id": "node_650",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 228.60 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.16e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.60130746706795,
      "fos_buckling": 1.2389658930441754,
      "fos_yielding": 1.571224315725892,
      "deflection": 0.0051635670088193445,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_649",
      "improvement_over_parent": null
    },
    "node_651": {
      "node_id": "node_651",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.37 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3660236778916,
      "fos_buckling": 1.5234689335043523,
      "fos_yielding": 2.013423614005726,
      "deflection": 0.00403878436726884,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.311)"
      },
      "parent_node_id": "node_650",
      "improvement_over_parent": null
    },
    "node_652": {
      "node_id": "node_652",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_651",
      "improvement_over_parent": null
    },
    "node_653": {
      "node_id": "node_653",
      "content": "INITIAL DESIGN (Trace 94)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_654": {
      "node_id": "node_654",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 260.31 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.3143225052971,
      "fos_buckling": 1.007141113701691,
      "fos_yielding": 1.9986517602972464,
      "deflection": 0.005007061235318009,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_653",
      "improvement_over_parent": null
    },
    "node_655": {
      "node_id": "node_655",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22685913691413,
      "fos_buckling": 1.5228847239535073,
      "fos_yielding": 2.0124410638590606,
      "deflection": 0.004040693575250053,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_654",
      "improvement_over_parent": null
    },
    "node_656": {
      "node_id": "node_656",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_655",
      "improvement_over_parent": null
    },
    "node_657": {
      "node_id": "node_657",
      "content": "INITIAL DESIGN (Trace 95)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 220.14 kg\n  Factor of Safety: 1.15\n  Max Deflection: 5.38e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.14317400327278,
      "fos_buckling": 1.1483462080398341,
      "fos_yielding": 1.5731185741628153,
      "deflection": 0.005379725802831351,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_658": {
      "node_id": "node_658",
      "content": "MODIFICATION: Increase 8 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 226.56 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.28e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.561721020962,
      "fos_buckling": 1.100733982162183,
      "fos_yielding": 1.5742862532638442,
      "deflection": 0.005283888952225551,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.359)"
      },
      "parent_node_id": "node_657",
      "improvement_over_parent": null
    },
    "node_659": {
      "node_id": "node_659",
      "content": "MODIFICATION: Increase 5 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 227.81 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.18e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.8106756925865,
      "fos_buckling": 1.2353208963971758,
      "fos_yielding": 1.5657544461628201,
      "deflection": 0.005181216556989805,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.477)"
      },
      "parent_node_id": "node_658",
      "improvement_over_parent": null
    },
    "node_660": {
      "node_id": "node_660",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.39 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3900448356722,
      "fos_buckling": 1.5235796744479257,
      "fos_yielding": 2.0135078141562284,
      "deflection": 0.004038434801495029,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.316)"
      },
      "parent_node_id": "node_659",
      "improvement_over_parent": null
    },
    "node_661": {
      "node_id": "node_661",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_660",
      "improvement_over_parent": null
    },
    "node_662": {
      "node_id": "node_662",
      "content": "INITIAL DESIGN (Trace 96)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 179.17 kg\n  Factor of Safety: 0.35\n  Max Deflection: 6.45e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.173456651994,
      "fos_buckling": 0.34639435767222626,
      "fos_yielding": 1.373968662131978,
      "deflection": 6445822641428.574,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_663": {
      "node_id": "node_663",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 183.81 kg\n  Factor of Safety: 0.54\n  Max Deflection: 1.06e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.81126326512808,
      "fos_buckling": 0.5361659057741233,
      "fos_yielding": 1.5585487553330664,
      "deflection": 0.010570124125600168,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002909)"
      },
      "parent_node_id": "node_662",
      "improvement_over_parent": null
    },
    "node_664": {
      "node_id": "node_664",
      "content": "MODIFICATION: Increase 1 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 190.07 kg\n  Factor of Safety: 0.54\n  Max Deflection: 9.57e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.07186902138372,
      "fos_buckling": 0.5359347636407017,
      "fos_yielding": 1.694919907471101,
      "deflection": 0.009571044625907361,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.460)"
      },
      "parent_node_id": "node_663",
      "improvement_over_parent": null
    },
    "node_665": {
      "node_id": "node_665",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 211.76 kg\n  Factor of Safety: 0.54\n  Max Deflection: 8.43e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.7595553484562,
      "fos_buckling": 0.5351355909651616,
      "fos_yielding": 1.693575622656163,
      "deflection": 0.008429687274451463,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004279)"
      },
      "parent_node_id": "node_664",
      "improvement_over_parent": null
    },
    "node_666": {
      "node_id": "node_666",
      "content": "MODIFICATION: Increase 1 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 222.35 kg\n  Factor of Safety: 0.53\n  Max Deflection: 8.08e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.35317080953345,
      "fos_buckling": 0.5347460911126399,
      "fos_yielding": 1.6929197651871453,
      "deflection": 0.008076236154449905,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.558)"
      },
      "parent_node_id": "node_665",
      "improvement_over_parent": null
    },
    "node_667": {
      "node_id": "node_667",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n\nPerformance:\n  Mass: 260.78 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.54e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.77592761723713,
      "fos_buckling": 1.3843050576276383,
      "fos_yielding": 1.7911388068460368,
      "deflection": 0.0045351136547106315,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005426)"
      },
      "parent_node_id": "node_666",
      "improvement_over_parent": null
    },
    "node_668": {
      "node_id": "node_668",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.05 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0542443749868,
      "fos_buckling": 1.5225821890576077,
      "fos_yielding": 2.011377320770607,
      "deflection": 0.004043151928248724,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.136)"
      },
      "parent_node_id": "node_667",
      "improvement_over_parent": null
    },
    "node_669": {
      "node_id": "node_669",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_668",
      "improvement_over_parent": null
    },
    "node_670": {
      "node_id": "node_670",
      "content": "INITIAL DESIGN (Trace 97)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 220.38 kg\n  Factor of Safety: 1.08\n  Max Deflection: 5.37e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.37569721824877,
      "fos_buckling": 1.077366231790764,
      "fos_yielding": 1.5770918296904506,
      "deflection": 0.005372277837858325,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_671": {
      "node_id": "node_671",
      "content": "MODIFICATION: Increase 10 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 226.08 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.07750132511018,
      "fos_buckling": 1.2138987130194532,
      "fos_yielding": 1.5933370971531846,
      "deflection": 0.005194457504707015,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.209)"
      },
      "parent_node_id": "node_670",
      "improvement_over_parent": null
    },
    "node_672": {
      "node_id": "node_672",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.37 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.3655639879808,
      "fos_buckling": 1.4854173326201867,
      "fos_yielding": 2.0286222330791177,
      "deflection": 0.004087462405321914,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.302)"
      },
      "parent_node_id": "node_671",
      "improvement_over_parent": null
    },
    "node_673": {
      "node_id": "node_673",
      "content": "MODIFICATION: Increase 3 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.35 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.35151185115603,
      "fos_buckling": 1.5230175703851505,
      "fos_yielding": 2.0133714091410884,
      "deflection": 0.004039065322222901,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.282)"
      },
      "parent_node_id": "node_672",
      "improvement_over_parent": null
    },
    "node_674": {
      "node_id": "node_674",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_673",
      "improvement_over_parent": null
    },
    "node_675": {
      "node_id": "node_675",
      "content": "INITIAL DESIGN (Trace 98)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0017)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 146.22 kg\n  Factor of Safety: 0.68\n  Max Deflection: 8.56e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.21878051891792,
      "fos_buckling": 0.6778385641122435,
      "fos_yielding": 0.8891921944731775,
      "deflection": 0.008564324191225853,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_676": {
      "node_id": "node_676",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 178.62 kg\n  Factor of Safety: 0.81\n  Max Deflection: 7.03e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.62415415614703,
      "fos_buckling": 0.8078607772166191,
      "fos_yielding": 1.0897172110003621,
      "deflection": 0.007026984204099902,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.235)"
      },
      "parent_node_id": "node_675",
      "improvement_over_parent": null
    },
    "node_677": {
      "node_id": "node_677",
      "content": "MODIFICATION: Increase 6 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 185.75 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.78e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.74993418940133,
      "fos_buckling": 0.8074643816534298,
      "fos_yielding": 1.0897172110003623,
      "deflection": 0.006779807239127494,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.321)"
      },
      "parent_node_id": "node_676",
      "improvement_over_parent": null
    },
    "node_678": {
      "node_id": "node_678",
      "content": "MODIFICATION: Increase 5 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 188.11 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.78e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.1087737253919,
      "fos_buckling": 0.8074643816534299,
      "fos_yielding": 1.631327489720059,
      "deflection": 0.0067798072391274935,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.529)"
      },
      "parent_node_id": "node_677",
      "improvement_over_parent": null
    },
    "node_679": {
      "node_id": "node_679",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n\nPerformance:\n  Mass: 205.48 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.70e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.47637515703937,
      "fos_buckling": 1.1231340199987343,
      "fos_yielding": 1.4455544587825515,
      "deflection": 0.005701717606881193,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003370)"
      },
      "parent_node_id": "node_678",
      "improvement_over_parent": null
    },
    "node_680": {
      "node_id": "node_680",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 245.85 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.78e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.85197060190183,
      "fos_buckling": 1.3086982425370335,
      "fos_yielding": 1.7275951135013543,
      "deflection": 0.004776904952193233,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.212)"
      },
      "parent_node_id": "node_679",
      "improvement_over_parent": null
    },
    "node_681": {
      "node_id": "node_681",
      "content": "MODIFICATION: Increase 9 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 252.42 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.42228939760486,
      "fos_buckling": 1.3415307112969521,
      "fos_yielding": 1.7421764166284488,
      "deflection": 0.004646652315670376,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.190)"
      },
      "parent_node_id": "node_680",
      "improvement_over_parent": null
    },
    "node_682": {
      "node_id": "node_682",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0074)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 296.00 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.97e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 295.9961792439166,
      "fos_buckling": 1.528844679548146,
      "fos_yielding": 2.0411769835094544,
      "deflection": 0.003972958903125989,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.190)"
      },
      "parent_node_id": "node_681",
      "improvement_over_parent": null
    },
    "node_683": {
      "node_id": "node_683",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_682",
      "improvement_over_parent": null
    },
    "node_684": {
      "node_id": "node_684",
      "content": "INITIAL DESIGN (Trace 99)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 172.88 kg\n  Factor of Safety: 0.97\n  Max Deflection: 6.81e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.87726421961025,
      "fos_buckling": 0.9709088168867004,
      "fos_yielding": 1.1897035071816258,
      "deflection": 0.0068058633412317465,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_685": {
      "node_id": "node_685",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 218.05 kg\n  Factor of Safety: 1.19\n  Max Deflection: 5.41e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.04917753616422,
      "fos_buckling": 1.1898671752553274,
      "fos_yielding": 1.499037398103084,
      "deflection": 0.00541014873766164,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.279)"
      },
      "parent_node_id": "node_684",
      "improvement_over_parent": null
    },
    "node_686": {
      "node_id": "node_686",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0053)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0056)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 266.40 kg\n  Factor of Safety: 1.41\n  Max Deflection: 4.44e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 266.40244188703497,
      "fos_buckling": 1.4085391359408004,
      "fos_yielding": 1.8294590034677771,
      "deflection": 0.004440635785788241,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.241)"
      },
      "parent_node_id": "node_685",
      "improvement_over_parent": null
    },
    "node_687": {
      "node_id": "node_687",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.31 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.30816914952203,
      "fos_buckling": 1.5232319457999626,
      "fos_yielding": 2.013007388931392,
      "deflection": 0.004039581791689198,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.111)"
      },
      "parent_node_id": "node_686",
      "improvement_over_parent": null
    },
    "node_688": {
      "node_id": "node_688",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_687",
      "improvement_over_parent": null
    },
    "node_689": {
      "node_id": "node_689",
      "content": "INITIAL DESIGN (Trace 100)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_690": {
      "node_id": "node_690",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 181.76 kg\n  Factor of Safety: 0.42\n  Max Deflection: 9.75e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.76090028278333,
      "fos_buckling": 0.42180726214665387,
      "fos_yielding": 1.6223597492520352,
      "deflection": 0.0097477203178042,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004077)"
      },
      "parent_node_id": "node_689",
      "improvement_over_parent": null
    },
    "node_691": {
      "node_id": "node_691",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 213.77 kg\n  Factor of Safety: 0.49\n  Max Deflection: 8.30e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.76785948288446,
      "fos_buckling": 0.48634309314991825,
      "fos_yielding": 1.9040384583734091,
      "deflection": 0.008299275766318882,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.193)"
      },
      "parent_node_id": "node_690",
      "improvement_over_parent": null
    },
    "node_692": {
      "node_id": "node_692",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 244.75 kg\n  Factor of Safety: 0.49\n  Max Deflection: 7.66e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.74640553196082,
      "fos_buckling": 0.4853094412899849,
      "fos_yielding": 1.9018841893715095,
      "deflection": 0.007661436135604219,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_691",
      "improvement_over_parent": null
    },
    "node_693": {
      "node_id": "node_693",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 287.94 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.94446346941305,
      "fos_buckling": 1.4821402265235286,
      "fos_yielding": 2.011966634984961,
      "deflection": 0.00409542505401479,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_692",
      "improvement_over_parent": null
    },
    "node_694": {
      "node_id": "node_694",
      "content": "MODIFICATION: Increase 2 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.27099838726826,
      "fos_buckling": 1.5230013307092367,
      "fos_yielding": 2.012718510836694,
      "deflection": 0.004040136997189626,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.284)"
      },
      "parent_node_id": "node_693",
      "improvement_over_parent": null
    },
    "node_695": {
      "node_id": "node_695",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_694",
      "improvement_over_parent": null
    },
    "node_696": {
      "node_id": "node_696",
      "content": "INITIAL DESIGN (Trace 101)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 217.68 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.97e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.6774285665362,
      "fos_buckling": 0.9008743867014448,
      "fos_yielding": 1.852750130677324,
      "deflection": 0.005974330918990244,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_697": {
      "node_id": "node_697",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n\nPerformance:\n  Mass: 233.50 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.03e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.49714544812576,
      "fos_buckling": 1.2488131399309823,
      "fos_yielding": 1.6433062599284725,
      "deflection": 0.005032191874317983,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003052)"
      },
      "parent_node_id": "node_696",
      "improvement_over_parent": null
    },
    "node_698": {
      "node_id": "node_698",
      "content": "MODIFICATION: Increase 3 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n\nPerformance:\n  Mass: 234.88 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.87872567202248,
      "fos_buckling": 1.2479695219055191,
      "fos_yielding": 1.643627702240583,
      "deflection": 0.004998212924473074,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.266)"
      },
      "parent_node_id": "node_697",
      "improvement_over_parent": null
    },
    "node_699": {
      "node_id": "node_699",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0049)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n\nPerformance:\n  Mass: 290.10 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.10319432138186,
      "fos_buckling": 1.4861381799334037,
      "fos_yielding": 2.0271621947645238,
      "deflection": 0.004059891363783497,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.258)"
      },
      "parent_node_id": "node_698",
      "improvement_over_parent": null
    },
    "node_700": {
      "node_id": "node_700",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_699",
      "improvement_over_parent": null
    },
    "node_701": {
      "node_id": "node_701",
      "content": "INITIAL DESIGN (Trace 102)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 201.97 kg\n  Factor of Safety: 0.33\n  Max Deflection: 3.09e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.96701740540433,
      "fos_buckling": 0.3331164645661953,
      "fos_yielding": 1.1679582027509328,
      "deflection": 30872403404333.28,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_702": {
      "node_id": "node_702",
      "content": "MODIFICATION: Increase 4 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 204.53 kg\n  Factor of Safety: 0.33\n  Max Deflection: 3.09e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.52514941011125,
      "fos_buckling": 0.3331164645661953,
      "fos_yielding": 1.1679582027509328,
      "deflection": 30872403404333.28,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.379)"
      },
      "parent_node_id": "node_701",
      "improvement_over_parent": null
    },
    "node_703": {
      "node_id": "node_703",
      "content": "MODIFICATION: Increase 7 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 218.90 kg\n  Factor of Safety: 0.56\n  Max Deflection: 8.78e+12 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.89643742101532,
      "fos_buckling": 0.5576038145080429,
      "fos_yielding": 2.0686889293501767,
      "deflection": 8782365616992.993,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.522)"
      },
      "parent_node_id": "node_702",
      "improvement_over_parent": null
    },
    "node_704": {
      "node_id": "node_704",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 224.11 kg\n  Factor of Safety: 0.64\n  Max Deflection: 3.51e+12 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.11026745482943,
      "fos_buckling": 0.6388332993248058,
      "fos_yielding": 1.500409828368501,
      "deflection": 3506812961146.3306,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_703",
      "improvement_over_parent": null
    },
    "node_705": {
      "node_id": "node_705",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 250.01 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.0077045972192,
      "fos_buckling": 0.5883794125746435,
      "fos_yielding": 1.9005345497048243,
      "deflection": 0.007194534835787123,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_704",
      "improvement_over_parent": null
    },
    "node_706": {
      "node_id": "node_706",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.21 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2057625346714,
      "fos_buckling": 1.5224756955724097,
      "fos_yielding": 2.0118198279489006,
      "deflection": 0.0040410221065682725,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_705",
      "improvement_over_parent": null
    },
    "node_707": {
      "node_id": "node_707",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_706",
      "improvement_over_parent": null
    },
    "node_708": {
      "node_id": "node_708",
      "content": "INITIAL DESIGN (Trace 103)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0016)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0021)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0021)]\n\nPerformance:\n  Mass: 118.09 kg\n  Factor of Safety: 0.42\n  Max Deflection: 1.57e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 118.08978851596783,
      "fos_buckling": 0.41765531104448395,
      "fos_yielding": 1.0263008395471498,
      "deflection": 0.015656958990385206,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_709": {
      "node_id": "node_709",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0019)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0027)]\n\nPerformance:\n  Mass: 146.58 kg\n  Factor of Safety: 0.51\n  Max Deflection: 1.26e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.57873861824436,
      "fos_buckling": 0.511360061724461,
      "fos_yielding": 1.272062175020698,
      "deflection": 0.012614133957717695,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.252)"
      },
      "parent_node_id": "node_708",
      "improvement_over_parent": null
    },
    "node_710": {
      "node_id": "node_710",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 175.21 kg\n  Factor of Safety: 0.60\n  Max Deflection: 1.06e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.2068056479511,
      "fos_buckling": 0.6027576038613985,
      "fos_yielding": 1.5182779761334004,
      "deflection": 0.0105529247198295,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.206)"
      },
      "parent_node_id": "node_709",
      "improvement_over_parent": null
    },
    "node_711": {
      "node_id": "node_711",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 218.72 kg\n  Factor of Safety: 0.74\n  Max Deflection: 8.45e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.72218317901383,
      "fos_buckling": 0.7363709917352811,
      "fos_yielding": 1.8910631471747876,
      "deflection": 0.008452720194130596,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.266)"
      },
      "parent_node_id": "node_710",
      "improvement_over_parent": null
    },
    "node_712": {
      "node_id": "node_712",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 269.40 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.86e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 269.3973436198595,
      "fos_buckling": 0.8838778722809145,
      "fos_yielding": 2.3228712092907977,
      "deflection": 0.0068613561835928726,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.253)"
      },
      "parent_node_id": "node_711",
      "improvement_over_parent": null
    },
    "node_713": {
      "node_id": "node_713",
      "content": "MODIFICATION: Increase 0 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 280.67 kg\n  Factor of Safety: 0.92\n  Max Deflection: 6.20e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 280.6739557135902,
      "fos_buckling": 0.9230308677550556,
      "fos_yielding": 2.276185762343752,
      "deflection": 0.006196968723427648,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.543)"
      },
      "parent_node_id": "node_712",
      "improvement_over_parent": null
    },
    "node_714": {
      "node_id": "node_714",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 285.89 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.18e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.8877857474043,
      "fos_buckling": 1.3539053352943098,
      "fos_yielding": 1.9927828654132642,
      "deflection": 0.0041765464393139174,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_713",
      "improvement_over_parent": null
    },
    "node_715": {
      "node_id": "node_715",
      "content": "MODIFICATION: Increase 10 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0041)]\n\nPerformance:\n  Mass: 286.97 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.9664525744601,
      "fos_buckling": 1.3649229426025442,
      "fos_yielding": 1.9883956677586112,
      "deflection": 0.004141600629980745,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.233)"
      },
      "parent_node_id": "node_714",
      "improvement_over_parent": null
    },
    "node_716": {
      "node_id": "node_716",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_715",
      "improvement_over_parent": null
    },
    "node_717": {
      "node_id": "node_717",
      "content": "INITIAL DESIGN (Trace 104)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 113.34 kg\n  Factor of Safety: 0.26\n  Max Deflection: 2.41e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 113.34362390814306,
      "fos_buckling": 0.26103561823826055,
      "fos_yielding": 0.5626536856381877,
      "deflection": 24099561537679.58,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_718": {
      "node_id": "node_718",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 141.66 kg\n  Factor of Safety: 1.02\n  Max Deflection: 1.40e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.65865412064983,
      "fos_buckling": 1.0191292692756928,
      "fos_yielding": 1.661628834333767,
      "deflection": 13975308249950.977,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003844)"
      },
      "parent_node_id": "node_717",
      "improvement_over_parent": null
    },
    "node_719": {
      "node_id": "node_719",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 161.86 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.32e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 161.85975021791361,
      "fos_buckling": 0.5157865967710236,
      "fos_yielding": 1.1253073712763755,
      "deflection": 13164708210883.78,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.152)"
      },
      "parent_node_id": "node_718",
      "improvement_over_parent": null
    },
    "node_720": {
      "node_id": "node_720",
      "content": "MODIFICATION: Increase 4 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 162.65 kg\n  Factor of Safety: 0.25\n  Max Deflection: 2.99e+13 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.64515311402465,
      "fos_buckling": 0.25138645567255824,
      "fos_yielding": 0.5626536856381877,
      "deflection": 29878992536210.79,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.279)"
      },
      "parent_node_id": "node_719",
      "improvement_over_parent": null
    },
    "node_721": {
      "node_id": "node_721",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 191.69 kg\n  Factor of Safety: 0.25\n  Max Deflection: 2.45e+13 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 191.69175936896744,
      "fos_buckling": 0.24578535342135072,
      "fos_yielding": 0.5626536856381877,
      "deflection": 24469758567371.01,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.193)"
      },
      "parent_node_id": "node_720",
      "improvement_over_parent": null
    },
    "node_722": {
      "node_id": "node_722",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 224.15 kg\n  Factor of Safety: 0.48\n  Max Deflection: 9.50e+12 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.15031906852343,
      "fos_buckling": 0.4790528782540708,
      "fos_yielding": 1.1253073712763755,
      "deflection": 9497875029032.326,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.186)"
      },
      "parent_node_id": "node_721",
      "improvement_over_parent": null
    },
    "node_723": {
      "node_id": "node_723",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 250.05 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.0477562109132,
      "fos_buckling": 0.588377814252341,
      "fos_yielding": 1.9006501064176877,
      "deflection": 0.007193392162394282,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_722",
      "improvement_over_parent": null
    },
    "node_724": {
      "node_id": "node_724",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2458141483654,
      "fos_buckling": 1.5230384404021555,
      "fos_yielding": 2.0125580880689644,
      "deflection": 0.0040403448446251575,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_723",
      "improvement_over_parent": null
    },
    "node_725": {
      "node_id": "node_725",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_724",
      "improvement_over_parent": null
    },
    "node_726": {
      "node_id": "node_726",
      "content": "INITIAL DESIGN (Trace 105)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 212.57 kg\n  Factor of Safety: 0.80\n  Max Deflection: 7.95e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.5726329478444,
      "fos_buckling": 0.803278848755022,
      "fos_yielding": 1.698178702123694,
      "deflection": 0.00794592535728083,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_727": {
      "node_id": "node_727",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 238.41 kg\n  Factor of Safety: 0.89\n  Max Deflection: 7.09e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.4101217054849,
      "fos_buckling": 0.8862297722075823,
      "fos_yielding": 1.9031882505505175,
      "deflection": 0.0070908682524779805,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.131)"
      },
      "parent_node_id": "node_726",
      "improvement_over_parent": null
    },
    "node_728": {
      "node_id": "node_728",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.12 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.1232013215428,
      "fos_buckling": 1.0369655230917378,
      "fos_yielding": 2.2967948724694494,
      "deflection": 0.005877075312491649,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.229)"
      },
      "parent_node_id": "node_727",
      "improvement_over_parent": null
    },
    "node_729": {
      "node_id": "node_729",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.34 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3370313553569,
      "fos_buckling": 1.523331290798355,
      "fos_yielding": 2.0132322393365922,
      "deflection": 0.004039243987712645,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_728",
      "improvement_over_parent": null
    },
    "node_730": {
      "node_id": "node_730",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_729",
      "improvement_over_parent": null
    },
    "node_731": {
      "node_id": "node_731",
      "content": "INITIAL DESIGN (Trace 106)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 201.78 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.92e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.7823526912258,
      "fos_buckling": 1.0092396987502599,
      "fos_yielding": 1.401861802693991,
      "deflection": 0.005917194674265179,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_732": {
      "node_id": "node_732",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 257.49 kg\n  Factor of Safety: 1.27\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.48707893176277,
      "fos_buckling": 1.2656741874913755,
      "fos_yielding": 1.7863023242439333,
      "deflection": 0.004650442909656724,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_731",
      "improvement_over_parent": null
    },
    "node_733": {
      "node_id": "node_733",
      "content": "MODIFICATION: Increase 5 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 258.80 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.57e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.80140499958304,
      "fos_buckling": 1.3752295231693261,
      "fos_yielding": 1.7775723125870146,
      "deflection": 0.004569060219184944,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.433)"
      },
      "parent_node_id": "node_732",
      "improvement_over_parent": null
    },
    "node_734": {
      "node_id": "node_734",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.96 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.95859879519753,
      "fos_buckling": 1.521767675945659,
      "fos_yielding": 2.010632123498721,
      "deflection": 0.004044335310438933,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.145)"
      },
      "parent_node_id": "node_733",
      "improvement_over_parent": null
    },
    "node_735": {
      "node_id": "node_735",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_734",
      "improvement_over_parent": null
    },
    "node_736": {
      "node_id": "node_736",
      "content": "INITIAL DESIGN (Trace 107)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 203.45 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.82e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.44688175619586,
      "fos_buckling": 0.9089388746943743,
      "fos_yielding": 1.0793338739022624,
      "deflection": 0.005823762712141069,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_737": {
      "node_id": "node_737",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 236.34 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.02e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.337293432334,
      "fos_buckling": 1.0437970412268287,
      "fos_yielding": 1.2563929313399684,
      "deflection": 0.005022272927740494,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.174)"
      },
      "parent_node_id": "node_736",
      "improvement_over_parent": null
    },
    "node_738": {
      "node_id": "node_738",
      "content": "MODIFICATION: Increase 4 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 238.31 kg\n  Factor of Safety: 1.09\n  Max Deflection: 4.94e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.31243000514314,
      "fos_buckling": 1.0948738484895795,
      "fos_yielding": 1.2569823720853788,
      "deflection": 0.0049410624388232256,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.536)"
      },
      "parent_node_id": "node_737",
      "improvement_over_parent": null
    },
    "node_739": {
      "node_id": "node_739",
      "content": "MODIFICATION: Increase 9 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 245.30 kg\n  Factor of Safety: 1.08\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.2972584257496,
      "fos_buckling": 1.0830309051733646,
      "fos_yielding": 1.2433859463395043,
      "deflection": 0.00485930318002144,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.393)"
      },
      "parent_node_id": "node_738",
      "improvement_over_parent": null
    },
    "node_740": {
      "node_id": "node_740",
      "content": "MODIFICATION: Increase 6 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 247.62 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.77e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.62189493917563,
      "fos_buckling": 1.3254441320584844,
      "fos_yielding": 1.699822653727493,
      "deflection": 0.004772253803713046,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.412)"
      },
      "parent_node_id": "node_739",
      "improvement_over_parent": null
    },
    "node_741": {
      "node_id": "node_741",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.16381046507485,
      "fos_buckling": 1.5225322359506281,
      "fos_yielding": 2.0104141497979704,
      "deflection": 0.004041560679049292,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.202)"
      },
      "parent_node_id": "node_740",
      "improvement_over_parent": null
    },
    "node_742": {
      "node_id": "node_742",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_741",
      "improvement_over_parent": null
    },
    "node_743": {
      "node_id": "node_743",
      "content": "INITIAL DESIGN (Trace 108)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 150.02 kg\n  Factor of Safety: 0.71\n  Max Deflection: 9.04e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 150.01980681147185,
      "fos_buckling": 0.7148001894990177,
      "fos_yielding": 1.417414800995378,
      "deflection": 0.009036488498543093,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_744": {
      "node_id": "node_744",
      "content": "MODIFICATION: Increase 2 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 152.66 kg\n  Factor of Safety: 0.71\n  Max Deflection: 8.94e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.66350818222207,
      "fos_buckling": 0.7146697572159663,
      "fos_yielding": 1.417414800995378,
      "deflection": 0.008937533298481055,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.252)"
      },
      "parent_node_id": "node_743",
      "improvement_over_parent": null
    },
    "node_745": {
      "node_id": "node_745",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 195.07 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.00e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.07458984808426,
      "fos_buckling": 0.8836643305667283,
      "fos_yielding": 1.8091337013373872,
      "deflection": 0.00700349492122579,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.297)"
      },
      "parent_node_id": "node_744",
      "improvement_over_parent": null
    },
    "node_746": {
      "node_id": "node_746",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n\nPerformance:\n  Mass: 212.49 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.64e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.48552186612972,
      "fos_buckling": 1.2300964980443485,
      "fos_yielding": 1.5800356424115651,
      "deflection": 0.005636581109615582,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002817)"
      },
      "parent_node_id": "node_745",
      "improvement_over_parent": null
    },
    "node_747": {
      "node_id": "node_747",
      "content": "MODIFICATION: Increase 1 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n\nPerformance:\n  Mass: 221.62 kg\n  Factor of Safety: 1.20\n  Max Deflection: 5.25e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.61582422643383,
      "fos_buckling": 1.2016626464980913,
      "fos_yielding": 1.613247766623037,
      "deflection": 0.0052506721427270295,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.527)"
      },
      "parent_node_id": "node_746",
      "improvement_over_parent": null
    },
    "node_748": {
      "node_id": "node_748",
      "content": "MODIFICATION: Increase 9 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0070)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n\nPerformance:\n  Mass: 235.49 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.96e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.4862049808608,
      "fos_buckling": 1.2371432527814632,
      "fos_yielding": 1.6392633108210783,
      "deflection": 0.004961195646899238,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.437)"
      },
      "parent_node_id": "node_747",
      "improvement_over_parent": null
    },
    "node_749": {
      "node_id": "node_749",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0090)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 297.72 kg\n  Factor of Safety: 1.50\n  Max Deflection: 3.94e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 297.7235379147864,
      "fos_buckling": 1.5038587560345598,
      "fos_yielding": 2.0713800902896016,
      "deflection": 0.003937323411058022,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.292)"
      },
      "parent_node_id": "node_748",
      "improvement_over_parent": null
    },
    "node_750": {
      "node_id": "node_750",
      "content": "MODIFICATION: Increase 2 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0090)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 301.51 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.90e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 301.5111943330995,
      "fos_buckling": 1.5345409273902537,
      "fos_yielding": 2.071901739632052,
      "deflection": 0.003899195000480472,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.188)"
      },
      "parent_node_id": "node_749",
      "improvement_over_parent": null
    },
    "node_751": {
      "node_id": "node_751",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_750",
      "improvement_over_parent": null
    },
    "node_752": {
      "node_id": "node_752",
      "content": "INITIAL DESIGN (Trace 109)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 171.65 kg\n  Factor of Safety: 0.61\n  Max Deflection: 8.60e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.65220345903572,
      "fos_buckling": 0.6097188496751146,
      "fos_yielding": 1.7723302769328944,
      "deflection": 0.008604292937058179,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_753": {
      "node_id": "node_753",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n\nPerformance:\n  Mass: 191.70 kg\n  Factor of Safety: 0.61\n  Max Deflection: 7.22e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 191.70398820087448,
      "fos_buckling": 0.608877150755973,
      "fos_yielding": 1.7723302769328944,
      "deflection": 0.007222198738729238,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003797)"
      },
      "parent_node_id": "node_752",
      "improvement_over_parent": null
    },
    "node_754": {
      "node_id": "node_754",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n\nPerformance:\n  Mass: 209.76 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.73e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.76154538517977,
      "fos_buckling": 0.9093014864723832,
      "fos_yielding": 1.5399906683099243,
      "deflection": 0.005730056631646399,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002927)"
      },
      "parent_node_id": "node_753",
      "improvement_over_parent": null
    },
    "node_755": {
      "node_id": "node_755",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 271.10 kg\n  Factor of Safety: 1.15\n  Max Deflection: 4.45e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 271.10373309181995,
      "fos_buckling": 1.1468965554165937,
      "fos_yielding": 1.985408757205941,
      "deflection": 0.004445770788371629,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.319)"
      },
      "parent_node_id": "node_754",
      "improvement_over_parent": null
    },
    "node_756": {
      "node_id": "node_756",
      "content": "MODIFICATION: Increase 10 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0059)]\n\nPerformance:\n  Mass: 282.16 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.31e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.16012742155607,
      "fos_buckling": 1.215728808087466,
      "fos_yielding": 1.9544863907127006,
      "deflection": 0.004314220396263874,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.524)"
      },
      "parent_node_id": "node_755",
      "improvement_over_parent": null
    },
    "node_757": {
      "node_id": "node_757",
      "content": "MODIFICATION: Increase 9 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0068)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0059)]\n\nPerformance:\n  Mass: 290.13 kg\n  Factor of Safety: 1.21\n  Max Deflection: 4.26e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.12922916063,
      "fos_buckling": 1.2131814556435505,
      "fos_yielding": 1.9550776151716311,
      "deflection": 0.004259604067188257,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.351)"
      },
      "parent_node_id": "node_756",
      "improvement_over_parent": null
    },
    "node_758": {
      "node_id": "node_758",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_757",
      "improvement_over_parent": null
    },
    "node_759": {
      "node_id": "node_759",
      "content": "INITIAL DESIGN (Trace 110)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_760": {
      "node_id": "node_760",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n\nPerformance:\n  Mass: 176.26 kg\n  Factor of Safety: 0.80\n  Max Deflection: 7.04e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.2612100460753,
      "fos_buckling": 0.8037578442705533,
      "fos_yielding": 1.6204192930694543,
      "deflection": 0.00704043722015461,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003347)"
      },
      "parent_node_id": "node_759",
      "improvement_over_parent": null
    },
    "node_761": {
      "node_id": "node_761",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 198.19 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.97e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.18614956710428,
      "fos_buckling": 1.0348062470764752,
      "fos_yielding": 1.4344368831530059,
      "deflection": 0.0059691179589449975,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003594)"
      },
      "parent_node_id": "node_760",
      "improvement_over_parent": null
    },
    "node_762": {
      "node_id": "node_762",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 235.03 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.04e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.02574021871337,
      "fos_buckling": 1.2135181553713335,
      "fos_yielding": 1.6988192004625877,
      "deflection": 0.005043297199518001,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.200)"
      },
      "parent_node_id": "node_761",
      "improvement_over_parent": null
    },
    "node_763": {
      "node_id": "node_763",
      "content": "MODIFICATION: Increase 8 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0081)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 253.71 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.74e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.71336045437127,
      "fos_buckling": 1.2230169133594002,
      "fos_yielding": 1.7336137560850087,
      "deflection": 0.004735991282384839,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.565)"
      },
      "parent_node_id": "node_762",
      "improvement_over_parent": null
    },
    "node_764": {
      "node_id": "node_764",
      "content": "MODIFICATION: Increase 5 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0059)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0081)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 257.82 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.67e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.8210978317692,
      "fos_buckling": 1.220144635713633,
      "fos_yielding": 2.559536151844635,
      "deflection": 0.004673746263741607,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.555)"
      },
      "parent_node_id": "node_763",
      "improvement_over_parent": null
    },
    "node_765": {
      "node_id": "node_765",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0071)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0098)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 306.23 kg\n  Factor of Safety: 1.41\n  Max Deflection: 3.94e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 306.2304532100875,
      "fos_buckling": 1.4092812759955748,
      "fos_yielding": 3.0127924655869536,
      "deflection": 0.00394091435011959,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.209)"
      },
      "parent_node_id": "node_764",
      "improvement_over_parent": null
    },
    "node_766": {
      "node_id": "node_766",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_765",
      "improvement_over_parent": null
    },
    "node_767": {
      "node_id": "node_767",
      "content": "INITIAL DESIGN (Trace 111)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_768": {
      "node_id": "node_768",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n\nPerformance:\n  Mass: 151.36 kg\n  Factor of Safety: 0.98\n  Max Deflection: 7.25e+12 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.3582633262771,
      "fos_buckling": 0.9775964782067289,
      "fos_yielding": 2.250614742552751,
      "deflection": 7251705408836.44,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004726)"
      },
      "parent_node_id": "node_767",
      "improvement_over_parent": null
    },
    "node_769": {
      "node_id": "node_769",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 173.00 kg\n  Factor of Safety: 0.47\n  Max Deflection: 1.24e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.00393565698656,
      "fos_buckling": 0.4748437026159924,
      "fos_yielding": 1.188165329560903,
      "deflection": 0.012405462421779777,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004270)"
      },
      "parent_node_id": "node_768",
      "improvement_over_parent": null
    },
    "node_770": {
      "node_id": "node_770",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 194.98 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.10e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.97886444020492,
      "fos_buckling": 0.5235494493657648,
      "fos_yielding": 1.3378893611952898,
      "deflection": 0.011025898348221942,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.139)"
      },
      "parent_node_id": "node_769",
      "improvement_over_parent": null
    },
    "node_771": {
      "node_id": "node_771",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 238.18 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.78e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.17692237765715,
      "fos_buckling": 0.5219971044537415,
      "fos_yielding": 1.5731719120480723,
      "deflection": 0.007780850666105415,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_770",
      "improvement_over_parent": null
    },
    "node_772": {
      "node_id": "node_772",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.76 kg\n  Factor of Safety: 1.50\n  Max Deflection: 4.28e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 282.758853545603,
      "fos_buckling": 1.502023681312825,
      "fos_yielding": 2.0150931357021826,
      "deflection": 0.004276375508957954,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_771",
      "improvement_over_parent": null
    },
    "node_773": {
      "node_id": "node_773",
      "content": "MODIFICATION: Increase 0 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2536702459626,
      "fos_buckling": 1.5229312764639629,
      "fos_yielding": 2.0126877074767937,
      "deflection": 0.004040309252062225,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.490)"
      },
      "parent_node_id": "node_772",
      "improvement_over_parent": null
    },
    "node_774": {
      "node_id": "node_774",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_773",
      "improvement_over_parent": null
    },
    "node_775": {
      "node_id": "node_775",
      "content": "INITIAL DESIGN (Trace 112)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 189.68 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.94e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.68218928225807,
      "fos_buckling": 0.8859373130136341,
      "fos_yielding": 1.9521832576898144,
      "deflection": 0.006935527110670132,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_776": {
      "node_id": "node_776",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 210.47 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.04e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.4749873928643,
      "fos_buckling": 0.8846704808266579,
      "fos_yielding": 1.7442152346531707,
      "deflection": 0.006036533295601581,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004088)"
      },
      "parent_node_id": "node_775",
      "improvement_over_parent": null
    },
    "node_777": {
      "node_id": "node_777",
      "content": "MODIFICATION: Increase 5 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0063)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 215.22 kg\n  Factor of Safety: 0.88\n  Max Deflection: 5.97e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.22161531790914,
      "fos_buckling": 0.8846704808266581,
      "fos_yielding": 2.694934934114145,
      "deflection": 0.005965647067247204,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.637)"
      },
      "parent_node_id": "node_776",
      "improvement_over_parent": null
    },
    "node_778": {
      "node_id": "node_778",
      "content": "MODIFICATION: Increase 5 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0075)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 217.38 kg\n  Factor of Safety: 0.88\n  Max Deflection: 5.95e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.38311446494777,
      "fos_buckling": 0.8846704808266581,
      "fos_yielding": 3.1277073851819033,
      "deflection": 0.005947652436318397,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.193)"
      },
      "parent_node_id": "node_777",
      "improvement_over_parent": null
    },
    "node_779": {
      "node_id": "node_779",
      "content": "MODIFICATION: Increase 8 thickness by 60%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0075)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0084)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 237.35 kg\n  Factor of Safety: 0.88\n  Max Deflection: 5.63e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.34808734332793,
      "fos_buckling": 0.8834574899322979,
      "fos_yielding": 3.1473022488473608,
      "deflection": 0.005628356357168908,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.597)"
      },
      "parent_node_id": "node_778",
      "improvement_over_parent": null
    },
    "node_780": {
      "node_id": "node_780",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0075)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0084)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 265.41 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.59e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.4098545694752,
      "fos_buckling": 1.074229940034073,
      "fos_yielding": 2.296562263413353,
      "deflection": 0.004586221094819524,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004524)"
      },
      "parent_node_id": "node_779",
      "improvement_over_parent": null
    },
    "node_781": {
      "node_id": "node_781",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0089)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0100)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 310.27 kg\n  Factor of Safety: 1.25\n  Max Deflection: 3.93e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 310.2651732348314,
      "fos_buckling": 1.2489198458517452,
      "fos_yielding": 2.706371439505822,
      "deflection": 0.003927082335934438,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.189)"
      },
      "parent_node_id": "node_780",
      "improvement_over_parent": null
    },
    "node_782": {
      "node_id": "node_782",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_781",
      "improvement_over_parent": null
    },
    "node_783": {
      "node_id": "node_783",
      "content": "INITIAL DESIGN (Trace 113)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 184.20 kg\n  Factor of Safety: 0.64\n  Max Deflection: 7.37e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.2024521848137,
      "fos_buckling": 0.6413921067379905,
      "fos_yielding": 1.5554138541531988,
      "deflection": 0.007368804835767012,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_784": {
      "node_id": "node_784",
      "content": "MODIFICATION: Increase 7 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 193.20 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.66e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.2001317388833,
      "fos_buckling": 0.8369614288112772,
      "fos_yielding": 1.555251207689829,
      "deflection": 0.006661682923720037,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.379)"
      },
      "parent_node_id": "node_783",
      "improvement_over_parent": null
    },
    "node_785": {
      "node_id": "node_785",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 242.26 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.33e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.25536625412678,
      "fos_buckling": 1.0081636495882036,
      "fos_yielding": 1.9462081065162211,
      "deflection": 0.00532905867619802,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.277)"
      },
      "parent_node_id": "node_784",
      "improvement_over_parent": null
    },
    "node_786": {
      "node_id": "node_786",
      "content": "MODIFICATION: Increase 9 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 252.94 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.15e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.9356926743618,
      "fos_buckling": 1.00742533417712,
      "fos_yielding": 1.9746220585678387,
      "deflection": 0.0051510504834374905,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.346)"
      },
      "parent_node_id": "node_785",
      "improvement_over_parent": null
    },
    "node_787": {
      "node_id": "node_787",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 285.85 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.19e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 285.8482293059788,
      "fos_buckling": 1.5225018567822026,
      "fos_yielding": 1.98734188227948,
      "deflection": 0.0041938448507898105,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_786",
      "improvement_over_parent": null
    },
    "node_788": {
      "node_id": "node_788",
      "content": "MODIFICATION: Increase 1 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.11 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.11218383206125,
      "fos_buckling": 1.5222832297736246,
      "fos_yielding": 2.011556239325302,
      "deflection": 0.004042351562420519,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.287)"
      },
      "parent_node_id": "node_787",
      "improvement_over_parent": null
    },
    "node_789": {
      "node_id": "node_789",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_788",
      "improvement_over_parent": null
    },
    "node_790": {
      "node_id": "node_790",
      "content": "INITIAL DESIGN (Trace 114)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n\nPerformance:\n  Mass: 145.81 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.46e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 145.81158388159824,
      "fos_buckling": 0.3962080211857901,
      "fos_yielding": 1.153738323445422,
      "deflection": 0.014626849580740398,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_791": {
      "node_id": "node_791",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 169.56 kg\n  Factor of Safety: 0.45\n  Max Deflection: 1.26e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.55546028103777,
      "fos_buckling": 0.45283611232654275,
      "fos_yielding": 1.337961789019174,
      "deflection": 0.012599679522756872,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.176)"
      },
      "parent_node_id": "node_790",
      "improvement_over_parent": null
    },
    "node_792": {
      "node_id": "node_792",
      "content": "MODIFICATION: Increase 1 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 176.78 kg\n  Factor of Safety: 0.45\n  Max Deflection: 1.26e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.78212565800698,
      "fos_buckling": 0.45261054347069973,
      "fos_yielding": 1.3379617890191708,
      "deflection": 0.012604765731553884,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.285)"
      },
      "parent_node_id": "node_791",
      "improvement_over_parent": null
    },
    "node_793": {
      "node_id": "node_793",
      "content": "MODIFICATION: Increase 0 thickness by 65%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 189.43 kg\n  Factor of Safety: 0.45\n  Max Deflection: 1.26e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.42535933022162,
      "fos_buckling": 0.4522164450866814,
      "fos_yielding": 1.3379617890191726,
      "deflection": 0.012613664182356817,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.650)"
      },
      "parent_node_id": "node_792",
      "improvement_over_parent": null
    },
    "node_794": {
      "node_id": "node_794",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 232.62 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.50e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.62341726767386,
      "fos_buckling": 0.5220177307070251,
      "fos_yielding": 1.5732820819753375,
      "deflection": 0.00849616428008747,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_793",
      "improvement_over_parent": null
    },
    "node_795": {
      "node_id": "node_795",
      "content": "MODIFICATION: Increase 9 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0089)]\n\nPerformance:\n  Mass: 249.39 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.27e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.3927182307361,
      "fos_buckling": 0.5214173425061731,
      "fos_yielding": 1.5727184394828535,
      "deflection": 0.008267811549163022,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.447)"
      },
      "parent_node_id": "node_794",
      "improvement_over_parent": null
    },
    "node_796": {
      "node_id": "node_796",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0089)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.97 kg\n  Factor of Safety: 1.46\n  Max Deflection: 3.99e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.974649398682,
      "fos_buckling": 1.4635641722249297,
      "fos_yielding": 2.035974597837371,
      "deflection": 0.003993986680243009,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_795",
      "improvement_over_parent": null
    },
    "node_797": {
      "node_id": "node_797",
      "content": "MODIFICATION: Increase 2 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0089)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 300.97 kg\n  Factor of Safety: 1.46\n  Max Deflection: 3.93e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 300.9686274843817,
      "fos_buckling": 1.4604334367939609,
      "fos_yielding": 2.036872156515923,
      "deflection": 0.0039330562719288925,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.406)"
      },
      "parent_node_id": "node_796",
      "improvement_over_parent": null
    },
    "node_798": {
      "node_id": "node_798",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_797",
      "improvement_over_parent": null
    },
    "node_799": {
      "node_id": "node_799",
      "content": "INITIAL DESIGN (Trace 115)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 189.48 kg\n  Factor of Safety: 1.05\n  Max Deflection: 6.29e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.48056414457085,
      "fos_buckling": 1.053446036124167,
      "fos_yielding": 1.2061527673044343,
      "deflection": 0.006291218684323951,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_800": {
      "node_id": "node_800",
      "content": "MODIFICATION: Increase 1 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 195.68 kg\n  Factor of Safety: 1.05\n  Max Deflection: 5.97e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.67949698921336,
      "fos_buckling": 1.0493597960020908,
      "fos_yielding": 1.2240300599910854,
      "deflection": 0.0059673628982050645,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.361)"
      },
      "parent_node_id": "node_799",
      "improvement_over_parent": null
    },
    "node_801": {
      "node_id": "node_801",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 219.45 kg\n  Factor of Safety: 1.16\n  Max Deflection: 5.33e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.45496325741453,
      "fos_buckling": 1.1585487093934368,
      "fos_yielding": 1.373299068678725,
      "deflection": 0.00532837942583176,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.130)"
      },
      "parent_node_id": "node_800",
      "improvement_over_parent": null
    },
    "node_802": {
      "node_id": "node_802",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 281.42 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.17e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.42011249174857,
      "fos_buckling": 1.4248450182566625,
      "fos_yielding": 1.7631178363529945,
      "deflection": 0.004170417489405573,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.309)"
      },
      "parent_node_id": "node_801",
      "improvement_over_parent": null
    },
    "node_803": {
      "node_id": "node_803",
      "content": "MODIFICATION: Increase 9 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.05 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.07e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.05266829811546,
      "fos_buckling": 1.4484549353746345,
      "fos_yielding": 1.7353317912747908,
      "deflection": 0.004069465500838189,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.572)"
      },
      "parent_node_id": "node_802",
      "improvement_over_parent": null
    },
    "node_804": {
      "node_id": "node_804",
      "content": "MODIFICATION: Increase 6 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.47 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4698709069844,
      "fos_buckling": 1.5235566617006897,
      "fos_yielding": 2.013271974769246,
      "deflection": 0.004037398711073818,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.182)"
      },
      "parent_node_id": "node_803",
      "improvement_over_parent": null
    },
    "node_805": {
      "node_id": "node_805",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_804",
      "improvement_over_parent": null
    },
    "node_806": {
      "node_id": "node_806",
      "content": "INITIAL DESIGN (Trace 116)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 214.35 kg\n  Factor of Safety: 0.48\n  Max Deflection: 1.61e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.34588973595575,
      "fos_buckling": 0.4791060841389439,
      "fos_yielding": 1.1253073712763755,
      "deflection": 16110727857780.656,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_807": {
      "node_id": "node_807",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 238.73 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.72e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.72736169678785,
      "fos_buckling": 0.521934943119904,
      "fos_yielding": 1.5729547774987567,
      "deflection": 0.0077246160179878865,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_806",
      "improvement_over_parent": null
    },
    "node_808": {
      "node_id": "node_808",
      "content": "MODIFICATION: Increase 7 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0071)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 248.16 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.66e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.16265432885962,
      "fos_buckling": 0.5215971580646085,
      "fos_yielding": 1.5726378219012453,
      "deflection": 0.007663637043353592,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.326)"
      },
      "parent_node_id": "node_807",
      "improvement_over_parent": null
    },
    "node_809": {
      "node_id": "node_809",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0071)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.74 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.7445854968055,
      "fos_buckling": 1.352563479284048,
      "fos_yielding": 2.015101387144684,
      "deflection": 0.00414963077912952,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_808",
      "improvement_over_parent": null
    },
    "node_810": {
      "node_id": "node_810",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_809",
      "improvement_over_parent": null
    },
    "node_811": {
      "node_id": "node_811",
      "content": "INITIAL DESIGN (Trace 117)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 125.11 kg\n  Factor of Safety: 0.57\n  Max Deflection: 1.14e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 125.11043210987128,
      "fos_buckling": 0.5690661140583784,
      "fos_yielding": 1.1792732167010946,
      "deflection": 0.011421293640552568,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_812": {
      "node_id": "node_812",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 139.29 kg\n  Factor of Safety: 0.63\n  Max Deflection: 1.03e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 139.28593481658288,
      "fos_buckling": 0.626829020760803,
      "fos_yielding": 1.3126944320622875,
      "deflection": 0.010270076578204244,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.119)"
      },
      "parent_node_id": "node_811",
      "improvement_over_parent": null
    },
    "node_813": {
      "node_id": "node_813",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n\nPerformance:\n  Mass: 153.26 kg\n  Factor of Safety: 0.63\n  Max Deflection: 8.68e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.2559609985098,
      "fos_buckling": 0.6262246541693968,
      "fos_yielding": 1.148873699930942,
      "deflection": 0.008675183063865456,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002677)"
      },
      "parent_node_id": "node_812",
      "improvement_over_parent": null
    },
    "node_814": {
      "node_id": "node_814",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n\nPerformance:\n  Mass: 176.84 kg\n  Factor of Safety: 0.71\n  Max Deflection: 7.53e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.8390248438535,
      "fos_buckling": 0.7108076289389482,
      "fos_yielding": 1.3249047200131914,
      "deflection": 0.007529249473385713,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.163)"
      },
      "parent_node_id": "node_813",
      "improvement_over_parent": null
    },
    "node_815": {
      "node_id": "node_815",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n\nPerformance:\n  Mass: 193.97 kg\n  Factor of Safety: 1.07\n  Max Deflection: 6.07e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.96748053776935,
      "fos_buckling": 1.0749117928312513,
      "fos_yielding": 1.3343329419518941,
      "deflection": 0.006073142924871571,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003210)"
      },
      "parent_node_id": "node_814",
      "improvement_over_parent": null
    },
    "node_816": {
      "node_id": "node_816",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 238.51 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.95e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.5084666419249,
      "fos_buckling": 1.2843669706358838,
      "fos_yielding": 1.6390870364685224,
      "deflection": 0.004951811134026674,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.247)"
      },
      "parent_node_id": "node_815",
      "improvement_over_parent": null
    },
    "node_817": {
      "node_id": "node_817",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2463242136672,
      "fos_buckling": 1.522969976124076,
      "fos_yielding": 2.012770252243591,
      "deflection": 0.004040307572026325,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.252)"
      },
      "parent_node_id": "node_816",
      "improvement_over_parent": null
    },
    "node_818": {
      "node_id": "node_818",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_817",
      "improvement_over_parent": null
    },
    "node_819": {
      "node_id": "node_819",
      "content": "INITIAL DESIGN (Trace 118)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 140.16 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.40e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 140.15758075952905,
      "fos_buckling": 0.3896360357761133,
      "fos_yielding": 1.149901803255729,
      "deflection": 0.013966299144962994,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_820": {
      "node_id": "node_820",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n\nPerformance:\n  Mass: 166.71 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.05e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.70790717318394,
      "fos_buckling": 0.852070867477914,
      "fos_yielding": 1.2205655358679686,
      "deflection": 0.00705065653942513,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003655)"
      },
      "parent_node_id": "node_819",
      "improvement_over_parent": null
    },
    "node_821": {
      "node_id": "node_821",
      "content": "MODIFICATION: Increase 10 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n\nPerformance:\n  Mass: 174.13 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.77e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.13499723906244,
      "fos_buckling": 0.8535877904179969,
      "fos_yielding": 1.2197594379201555,
      "deflection": 0.006767028408874095,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.300)"
      },
      "parent_node_id": "node_820",
      "improvement_over_parent": null
    },
    "node_822": {
      "node_id": "node_822",
      "content": "MODIFICATION: Increase 8 thickness by 62%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0050)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n\nPerformance:\n  Mass: 184.88 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.58e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.88076116465754,
      "fos_buckling": 0.9042227464251094,
      "fos_yielding": 1.201322614366677,
      "deflection": 0.006575334793712356,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.616)"
      },
      "parent_node_id": "node_821",
      "improvement_over_parent": null
    },
    "node_823": {
      "node_id": "node_823",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0060)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0057)]\n\nPerformance:\n  Mass: 218.10 kg\n  Factor of Safety: 1.05\n  Max Deflection: 5.58e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.10322437480497,
      "fos_buckling": 1.0514414551305364,
      "fos_yielding": 1.4180820603111743,
      "deflection": 0.0055796264752418665,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.193)"
      },
      "parent_node_id": "node_822",
      "improvement_over_parent": null
    },
    "node_824": {
      "node_id": "node_824",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0074)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0070)]\n\nPerformance:\n  Mass: 264.95 kg\n  Factor of Safety: 1.25\n  Max Deflection: 4.60e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.94514215325006,
      "fos_buckling": 1.251018628467922,
      "fos_yielding": 1.7243910364650339,
      "deflection": 0.004599689203633906,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.235)"
      },
      "parent_node_id": "node_823",
      "improvement_over_parent": null
    },
    "node_825": {
      "node_id": "node_825",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0084)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0080)]\n\nPerformance:\n  Mass: 299.28 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 299.277302308767,
      "fos_buckling": 1.3908321830945687,
      "fos_yielding": 1.9495046229199007,
      "deflection": 0.004076058992780806,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_824",
      "improvement_over_parent": null
    },
    "node_826": {
      "node_id": "node_826",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_825",
      "improvement_over_parent": null
    },
    "node_827": {
      "node_id": "node_827",
      "content": "INITIAL DESIGN (Trace 119)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 162.86 kg\n  Factor of Safety: 0.69\n  Max Deflection: 7.88e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.8584512797397,
      "fos_buckling": 0.6918470491433175,
      "fos_yielding": 1.297337989972962,
      "deflection": 0.007876840522066919,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_828": {
      "node_id": "node_828",
      "content": "MODIFICATION: Increase 3 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 166.88 kg\n  Factor of Safety: 0.69\n  Max Deflection: 7.77e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.88013053985375,
      "fos_buckling": 0.6916551878259316,
      "fos_yielding": 1.284147338519022,
      "deflection": 0.007765362927506306,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.366)"
      },
      "parent_node_id": "node_827",
      "improvement_over_parent": null
    },
    "node_829": {
      "node_id": "node_829",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 187.86 kg\n  Factor of Safety: 0.77\n  Max Deflection: 6.91e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.8613395912323,
      "fos_buckling": 0.7669267308028126,
      "fos_yielding": 1.444864034525623,
      "deflection": 0.006907104972390447,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.134)"
      },
      "parent_node_id": "node_828",
      "improvement_over_parent": null
    },
    "node_830": {
      "node_id": "node_830",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 222.29 kg\n  Factor of Safety: 0.88\n  Max Deflection: 5.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.28623388603793,
      "fos_buckling": 0.8848551372079374,
      "fos_yielding": 1.708206364415007,
      "deflection": 0.005849917479403675,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.198)"
      },
      "parent_node_id": "node_829",
      "improvement_over_parent": null
    },
    "node_831": {
      "node_id": "node_831",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.53 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.529786081055,
      "fos_buckling": 1.0077942134524507,
      "fos_yielding": 2.0002467865506746,
      "deflection": 0.0050030456683465094,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.189)"
      },
      "parent_node_id": "node_830",
      "improvement_over_parent": null
    },
    "node_832": {
      "node_id": "node_832",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.44 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.442322712672,
      "fos_buckling": 1.5239098737136108,
      "fos_yielding": 2.0140445684684285,
      "deflection": 0.0040376554990637125,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_831",
      "improvement_over_parent": null
    },
    "node_833": {
      "node_id": "node_833",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_832",
      "improvement_over_parent": null
    },
    "node_834": {
      "node_id": "node_834",
      "content": "INITIAL DESIGN (Trace 120)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 213.89 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.62e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.8865426286517,
      "fos_buckling": 0.47573256698954686,
      "fos_yielding": 1.405376502119896,
      "deflection": 0.008616430066759006,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_835": {
      "node_id": "node_835",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 239.86 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.70e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.85880471203475,
      "fos_buckling": 0.522228112276544,
      "fos_yielding": 1.5741567542163986,
      "deflection": 0.007695301270739001,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.133)"
      },
      "parent_node_id": "node_834",
      "improvement_over_parent": null
    },
    "node_836": {
      "node_id": "node_836",
      "content": "MODIFICATION: Increase 7 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 248.87 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.51e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.87292493653544,
      "fos_buckling": 0.5219052395237121,
      "fos_yielding": 1.5738537207005816,
      "deflection": 0.0075140596087111,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.289)"
      },
      "parent_node_id": "node_835",
      "improvement_over_parent": null
    },
    "node_837": {
      "node_id": "node_837",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.45 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.45485610448134,
      "fos_buckling": 1.5231401002292144,
      "fos_yielding": 2.0139304384849597,
      "deflection": 0.0040376150331705545,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_836",
      "improvement_over_parent": null
    },
    "node_838": {
      "node_id": "node_838",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_837",
      "improvement_over_parent": null
    },
    "node_839": {
      "node_id": "node_839",
      "content": "INITIAL DESIGN (Trace 121)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_840": {
      "node_id": "node_840",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 191.98 kg\n  Factor of Safety: 0.96\n  Max Deflection: 8.13e+12 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 191.98115827832856,
      "fos_buckling": 0.9582121682778878,
      "fos_yielding": 2.250614742552751,
      "deflection": 8127155151961.783,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_839",
      "improvement_over_parent": null
    },
    "node_841": {
      "node_id": "node_841",
      "content": "MODIFICATION: Increase 7 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0069)]\n\nPerformance:\n  Mass: 200.27 kg\n  Factor of Safety: 0.48\n  Max Deflection: 1.42e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.26539412537448,
      "fos_buckling": 0.4791060841389439,
      "fos_yielding": 1.1253073712763755,
      "deflection": 14175620113191.906,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.285)"
      },
      "parent_node_id": "node_840",
      "improvement_over_parent": null
    },
    "node_842": {
      "node_id": "node_842",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0069)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 244.85 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.84732529332035,
      "fos_buckling": 1.0082098333322391,
      "fos_yielding": 2.2880416016802037,
      "deflection": 0.005935796872605997,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_841",
      "improvement_over_parent": null
    },
    "node_843": {
      "node_id": "node_843",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0069)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 269.23 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 269.2287972541525,
      "fos_buckling": 1.0065261808634955,
      "fos_yielding": 2.016652569290787,
      "deflection": 0.005073817917534733,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_842",
      "improvement_over_parent": null
    },
    "node_844": {
      "node_id": "node_844",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0069)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 295.13 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.04e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 295.12623439654226,
      "fos_buckling": 1.4767082895612955,
      "fos_yielding": 2.0308945876456037,
      "deflection": 0.004040932364337041,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_843",
      "improvement_over_parent": null
    },
    "node_845": {
      "node_id": "node_845",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_844",
      "improvement_over_parent": null
    },
    "node_846": {
      "node_id": "node_846",
      "content": "INITIAL DESIGN (Trace 122)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 234.28 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.80e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.27500365538208,
      "fos_buckling": 0.5163424000933757,
      "fos_yielding": 1.6370861336092215,
      "deflection": 0.007801089100608673,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_847": {
      "node_id": "node_847",
      "content": "MODIFICATION: Increase 1 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 244.40 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.54e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.39935460657492,
      "fos_buckling": 0.5159837837791322,
      "fos_yielding": 1.6698547206726102,
      "deflection": 0.007543424204726005,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.445)"
      },
      "parent_node_id": "node_846",
      "improvement_over_parent": null
    },
    "node_848": {
      "node_id": "node_848",
      "content": "MODIFICATION: Increase 2 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 248.19 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.23e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.18563752790678,
      "fos_buckling": 0.5886146123074981,
      "fos_yielding": 1.6697981319276023,
      "deflection": 0.007232821093347157,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.188)"
      },
      "parent_node_id": "node_847",
      "improvement_over_parent": null
    },
    "node_849": {
      "node_id": "node_849",
      "content": "MODIFICATION: Increase 6 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 250.05 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.05133103704077,
      "fos_buckling": 0.5886146123074982,
      "fos_yielding": 1.9005296305768846,
      "deflection": 0.007193065936604041,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.253)"
      },
      "parent_node_id": "node_848",
      "improvement_over_parent": null
    },
    "node_850": {
      "node_id": "node_850",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.249388974493,
      "fos_buckling": 1.5226810683666083,
      "fos_yielding": 2.0114849925799727,
      "deflection": 0.0040404009071681735,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_849",
      "improvement_over_parent": null
    },
    "node_851": {
      "node_id": "node_851",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_850",
      "improvement_over_parent": null
    },
    "node_852": {
      "node_id": "node_852",
      "content": "INITIAL DESIGN (Trace 123)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 154.28 kg\n  Factor of Safety: 0.35\n  Max Deflection: 3.15e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 154.28284556800793,
      "fos_buckling": 0.3548800134007816,
      "fos_yielding": 1.2040202026132343,
      "deflection": 0.03151644437047289,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_853": {
      "node_id": "node_853",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 173.13 kg\n  Factor of Safety: 0.39\n  Max Deflection: 2.81e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.12886881854544,
      "fos_buckling": 0.3931274176077461,
      "fos_yielding": 1.3497235271413524,
      "deflection": 0.028100035362796903,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.130)"
      },
      "parent_node_id": "node_852",
      "improvement_over_parent": null
    },
    "node_854": {
      "node_id": "node_854",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n\nPerformance:\n  Mass: 203.67 kg\n  Factor of Safety: 0.77\n  Max Deflection: 8.29e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.67256407470572,
      "fos_buckling": 0.7739166414985701,
      "fos_yielding": 1.6275290248449896,
      "deflection": 0.008290808888682536,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004240)"
      },
      "parent_node_id": "node_853",
      "improvement_over_parent": null
    },
    "node_855": {
      "node_id": "node_855",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n\nPerformance:\n  Mass: 254.79 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.64e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.78800409896155,
      "fos_buckling": 0.9371127074997048,
      "fos_yielding": 2.033030974556116,
      "deflection": 0.0066387562474093005,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_854",
      "improvement_over_parent": null
    },
    "node_856": {
      "node_id": "node_856",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 259.40 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.56e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.39936986598855,
      "fos_buckling": 1.3778750089672307,
      "fos_yielding": 1.7816961798826003,
      "deflection": 0.004558718669823658,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002891)"
      },
      "parent_node_id": "node_855",
      "improvement_over_parent": null
    },
    "node_857": {
      "node_id": "node_857",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.39 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3932423951772,
      "fos_buckling": 1.523592054192899,
      "fos_yielding": 2.0136408695330457,
      "deflection": 0.004038474069175331,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_856",
      "improvement_over_parent": null
    },
    "node_858": {
      "node_id": "node_858",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_857",
      "improvement_over_parent": null
    },
    "node_859": {
      "node_id": "node_859",
      "content": "INITIAL DESIGN (Trace 124)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0021)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 127.92 kg\n  Factor of Safety: 0.51\n  Max Deflection: 1.45e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 127.92201797223082,
      "fos_buckling": 0.5112731822781615,
      "fos_yielding": 0.9258932140454466,
      "deflection": 14473873803923.436,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_860": {
      "node_id": "node_860",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 142.40 kg\n  Factor of Safety: 0.04\n  Max Deflection: 1.88e+14 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 142.39780251933328,
      "fos_buckling": 0.04471946365527145,
      "fos_yielding": 0.15432846121074012,
      "deflection": 187679630191157.56,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.120)"
      },
      "parent_node_id": "node_859",
      "improvement_over_parent": null
    },
    "node_861": {
      "node_id": "node_861",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 179.34 kg\n  Factor of Safety: 0.49\n  Max Deflection: 1.33e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.34273019691003,
      "fos_buckling": 0.4895522261762667,
      "fos_yielding": 1.1253073712763755,
      "deflection": 13291799043596.422,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.280)"
      },
      "parent_node_id": "node_860",
      "improvement_over_parent": null
    },
    "node_862": {
      "node_id": "node_862",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n\nPerformance:\n  Mass: 210.08 kg\n  Factor of Safety: 0.76\n  Max Deflection: 6.46e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.0825486072357,
      "fos_buckling": 0.7565217497515463,
      "fos_yielding": 1.7149583835813382,
      "deflection": 0.006462695976502574,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004269)"
      },
      "parent_node_id": "node_861",
      "improvement_over_parent": null
    },
    "node_863": {
      "node_id": "node_863",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n\nPerformance:\n  Mass: 239.34 kg\n  Factor of Safety: 0.85\n  Max Deflection: 5.68e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.3430070277675,
      "fos_buckling": 0.8469027702427391,
      "fos_yielding": 1.9512910880610128,
      "deflection": 0.005678771680730251,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.152)"
      },
      "parent_node_id": "node_862",
      "improvement_over_parent": null
    },
    "node_864": {
      "node_id": "node_864",
      "content": "MODIFICATION: Increase 1 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n\nPerformance:\n  Mass: 252.34 kg\n  Factor of Safety: 0.85\n  Max Deflection: 5.38e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.33534816111717,
      "fos_buckling": 0.8461482591733246,
      "fos_yielding": 2.000156008072447,
      "deflection": 0.005375876456544959,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.645)"
      },
      "parent_node_id": "node_863",
      "improvement_over_parent": null
    },
    "node_865": {
      "node_id": "node_865",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 285.25 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.18e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.24788479273417,
      "fos_buckling": 1.3446840534971545,
      "fos_yielding": 2.015272797500265,
      "deflection": 0.0041842880535236954,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_864",
      "improvement_over_parent": null
    },
    "node_866": {
      "node_id": "node_866",
      "content": "MODIFICATION: Increase 7 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0066)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 292.25 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.25068217529906,
      "fos_buckling": 1.3423197601097492,
      "fos_yielding": 2.0009173834794027,
      "deflection": 0.004139822435511985,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.255)"
      },
      "parent_node_id": "node_865",
      "improvement_over_parent": null
    },
    "node_867": {
      "node_id": "node_867",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_866",
      "improvement_over_parent": null
    },
    "node_868": {
      "node_id": "node_868",
      "content": "INITIAL DESIGN (Trace 125)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 186.35 kg\n  Factor of Safety: 0.72\n  Max Deflection: 8.10e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.3475372992719,
      "fos_buckling": 0.7224690072613434,
      "fos_yielding": 2.0663757178066744,
      "deflection": 0.008103404561019927,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_869": {
      "node_id": "node_869",
      "content": "MODIFICATION: Increase 0 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 196.92 kg\n  Factor of Safety: 0.72\n  Max Deflection: 7.30e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.92413489441603,
      "fos_buckling": 0.72194312589355,
      "fos_yielding": 2.0663757178066744,
      "deflection": 0.007303799125892936,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.570)"
      },
      "parent_node_id": "node_868",
      "improvement_over_parent": null
    },
    "node_870": {
      "node_id": "node_870",
      "content": "MODIFICATION: Increase 6 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 205.83 kg\n  Factor of Safety: 0.72\n  Max Deflection: 7.31e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.83097287777187,
      "fos_buckling": 0.7215008604701854,
      "fos_yielding": 2.066375717806675,
      "deflection": 0.007309392454258267,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.464)"
      },
      "parent_node_id": "node_869",
      "improvement_over_parent": null
    },
    "node_871": {
      "node_id": "node_871",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 227.86 kg\n  Factor of Safety: 0.79\n  Max Deflection: 6.61e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.85853774227456,
      "fos_buckling": 0.7904007512269909,
      "fos_yielding": 2.285825807610903,
      "deflection": 0.006609858933208502,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.117)"
      },
      "parent_node_id": "node_870",
      "improvement_over_parent": null
    },
    "node_872": {
      "node_id": "node_872",
      "content": "MODIFICATION: Increase 8 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 241.32 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.31911465340335,
      "fos_buckling": 1.007875331740316,
      "fos_yielding": 2.285825807610902,
      "deflection": 0.00593800504767158,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.475)"
      },
      "parent_node_id": "node_871",
      "improvement_over_parent": null
    },
    "node_873": {
      "node_id": "node_873",
      "content": "MODIFICATION: Increase 2 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 242.83 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.82775861421186,
      "fos_buckling": 1.007875331740316,
      "fos_yielding": 2.285825807610902,
      "deflection": 0.005938005047671581,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.299)"
      },
      "parent_node_id": "node_872",
      "improvement_over_parent": null
    },
    "node_874": {
      "node_id": "node_874",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 268.73 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.72519575660164,
      "fos_buckling": 1.071338139600509,
      "fos_yielding": 2.285825807610902,
      "deflection": 0.004855447445749114,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_873",
      "improvement_over_parent": null
    },
    "node_875": {
      "node_id": "node_875",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.11 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.10666771743377,
      "fos_buckling": 1.5219721659417935,
      "fos_yielding": 2.011226619749387,
      "deflection": 0.004042486004596224,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_874",
      "improvement_over_parent": null
    },
    "node_876": {
      "node_id": "node_876",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_875",
      "improvement_over_parent": null
    },
    "node_877": {
      "node_id": "node_877",
      "content": "INITIAL DESIGN (Trace 126)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 212.87 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.30e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.87214718013678,
      "fos_buckling": 0.864543659454308,
      "fos_yielding": 1.6289166667774881,
      "deflection": 0.006303515357044718,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_878": {
      "node_id": "node_878",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 256.43 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.25e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.4311046716336,
      "fos_buckling": 1.0071655757639666,
      "fos_yielding": 1.9596706050677342,
      "deflection": 0.0052454777274614905,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_877",
      "improvement_over_parent": null
    },
    "node_879": {
      "node_id": "node_879",
      "content": "MODIFICATION: Increase 1 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 267.26 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.260735625756,
      "fos_buckling": 1.006418414111396,
      "fos_yielding": 1.9977659678013064,
      "deflection": 0.00500991869850381,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.490)"
      },
      "parent_node_id": "node_878",
      "improvement_over_parent": null
    },
    "node_880": {
      "node_id": "node_880",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1581727681458,
      "fos_buckling": 1.5224228226065986,
      "fos_yielding": 2.011888479126113,
      "deflection": 0.004041597790893012,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_879",
      "improvement_over_parent": null
    },
    "node_881": {
      "node_id": "node_881",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_880",
      "improvement_over_parent": null
    },
    "node_882": {
      "node_id": "node_882",
      "content": "INITIAL DESIGN (Trace 127)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 146.51 kg\n  Factor of Safety: 0.77\n  Max Deflection: 8.13e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.508124954964,
      "fos_buckling": 0.7656343932386112,
      "fos_yielding": 1.047516616197981,
      "deflection": 0.008133963550603055,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_883": {
      "node_id": "node_883",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 162.16 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.36e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.1562155535367,
      "fos_buckling": 0.8405757224734033,
      "fos_yielding": 1.1587849536206383,
      "deflection": 0.007355073234271623,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.112)"
      },
      "parent_node_id": "node_882",
      "improvement_over_parent": null
    },
    "node_884": {
      "node_id": "node_884",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 182.58 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.54e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.58471016151415,
      "fos_buckling": 0.9364338104636977,
      "fos_yielding": 1.3038615177525434,
      "deflection": 0.0065391347748585665,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.133)"
      },
      "parent_node_id": "node_883",
      "improvement_over_parent": null
    },
    "node_885": {
      "node_id": "node_885",
      "content": "MODIFICATION: Increase 7 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 187.40 kg\n  Factor of Safety: 1.06\n  Max Deflection: 6.34e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.39519796380412,
      "fos_buckling": 1.0619147226635022,
      "fos_yielding": 1.303063571463399,
      "deflection": 0.006338939713696582,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.218)"
      },
      "parent_node_id": "node_884",
      "improvement_over_parent": null
    },
    "node_886": {
      "node_id": "node_886",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 227.44 kg\n  Factor of Safety: 1.26\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.43632249867485,
      "fos_buckling": 1.2551275840841756,
      "fos_yielding": 1.579854573627235,
      "deflection": 0.005234364872816132,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.229)"
      },
      "parent_node_id": "node_885",
      "improvement_over_parent": null
    },
    "node_887": {
      "node_id": "node_887",
      "content": "MODIFICATION: Increase 1 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 231.99 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.09e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.99475971181417,
      "fos_buckling": 1.2546566968005202,
      "fos_yielding": 1.5944786343314656,
      "deflection": 0.00508909538436708,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.211)"
      },
      "parent_node_id": "node_886",
      "improvement_over_parent": null
    },
    "node_888": {
      "node_id": "node_888",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 262.34 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.51e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.33931268227764,
      "fos_buckling": 1.3908517788529926,
      "fos_yielding": 1.8017998285281147,
      "deflection": 0.004508380544211475,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.142)"
      },
      "parent_node_id": "node_887",
      "improvement_over_parent": null
    },
    "node_889": {
      "node_id": "node_889",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.61 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.6092825484693,
      "fos_buckling": 1.5245570699187305,
      "fos_yielding": 2.015146928397232,
      "deflection": 0.004035536361575366,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.131)"
      },
      "parent_node_id": "node_888",
      "improvement_over_parent": null
    },
    "node_890": {
      "node_id": "node_890",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_889",
      "improvement_over_parent": null
    },
    "node_891": {
      "node_id": "node_891",
      "content": "INITIAL DESIGN (Trace 128)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n\nPerformance:\n  Mass: 228.62 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.61514664085337,
      "fos_buckling": 0.4433396673886835,
      "fos_yielding": 1.366993734660522,
      "deflection": 0.010240475203164805,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_892": {
      "node_id": "node_892",
      "content": "MODIFICATION: Increase 9 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 232.91 kg\n  Factor of Safety: 0.44\n  Max Deflection: 9.24e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.91261158832677,
      "fos_buckling": 0.4432088479938575,
      "fos_yielding": 1.5742082809162878,
      "deflection": 0.009241969697625496,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.297)"
      },
      "parent_node_id": "node_891",
      "improvement_over_parent": null
    },
    "node_893": {
      "node_id": "node_893",
      "content": "MODIFICATION: Increase 3 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 237.26 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.82e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.2587689756921,
      "fos_buckling": 0.5223073978536275,
      "fos_yielding": 1.5737696207963279,
      "deflection": 0.00882472824287291,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.238)"
      },
      "parent_node_id": "node_892",
      "improvement_over_parent": null
    },
    "node_894": {
      "node_id": "node_894",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 281.84 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.840700143638,
      "fos_buckling": 1.4358343196035581,
      "fos_yielding": 2.0492644805975657,
      "deflection": 0.004156987066481506,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_893",
      "improvement_over_parent": null
    },
    "node_895": {
      "node_id": "node_895",
      "content": "MODIFICATION: Increase 9 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.25110005204914,
      "fos_buckling": 1.5230594517365013,
      "fos_yielding": 2.012383547993458,
      "deflection": 0.004040485174776328,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.639)"
      },
      "parent_node_id": "node_894",
      "improvement_over_parent": null
    },
    "node_896": {
      "node_id": "node_896",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_895",
      "improvement_over_parent": null
    },
    "node_897": {
      "node_id": "node_897",
      "content": "INITIAL DESIGN (Trace 129)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n\nPerformance:\n  Mass: 124.98 kg\n  Factor of Safety: 0.05\n  Max Deflection: 1.62e+14 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 124.98265921419497,
      "fos_buckling": 0.05393537994620224,
      "fos_yielding": 0.1931677428375223,
      "deflection": 161951521044542.34,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_898": {
      "node_id": "node_898",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 155.30 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.11e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.29661754391452,
      "fos_buckling": 1.4782436174565738,
      "fos_yielding": 1.3765439661736836,
      "deflection": 41147401410598.266,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.259)"
      },
      "parent_node_id": "node_897",
      "improvement_over_parent": null
    },
    "node_899": {
      "node_id": "node_899",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n\nPerformance:\n  Mass: 178.15 kg\n  Factor of Safety: 0.04\n  Max Deflection: 5.95e+14 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.14654110260906,
      "fos_buckling": 0.036714275168125,
      "fos_yielding": 0.09865851844273583,
      "deflection": 594921358742742.6,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.159)"
      },
      "parent_node_id": "node_898",
      "improvement_over_parent": null
    },
    "node_900": {
      "node_id": "node_900",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 217.29 kg\n  Factor of Safety: 0.91\n  Max Deflection: 7.15e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.29463673557052,
      "fos_buckling": 0.9066685950806374,
      "fos_yielding": 1.9962093937947467,
      "deflection": 0.007149508140099289,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005436)"
      },
      "parent_node_id": "node_899",
      "improvement_over_parent": null
    },
    "node_901": {
      "node_id": "node_901",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 221.87 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.15e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.8736477542268,
      "fos_buckling": 0.9060980896023814,
      "fos_yielding": 1.756499897872271,
      "deflection": 0.006147874211698986,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002869)"
      },
      "parent_node_id": "node_900",
      "improvement_over_parent": null
    },
    "node_902": {
      "node_id": "node_902",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n\nPerformance:\n  Mass: 250.78 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.77e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.77633139614971,
      "fos_buckling": 1.366480942193967,
      "fos_yielding": 1.7699306025732076,
      "deflection": 0.0047710934336909604,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004671)"
      },
      "parent_node_id": "node_901",
      "improvement_over_parent": null
    },
    "node_903": {
      "node_id": "node_903",
      "content": "MODIFICATION: Increase 0 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n\nPerformance:\n  Mass: 257.48 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.59e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.48310228402073,
      "fos_buckling": 1.3694427655827421,
      "fos_yielding": 1.7685296476832597,
      "deflection": 0.0045921101095399135,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.314)"
      },
      "parent_node_id": "node_902",
      "improvement_over_parent": null
    },
    "node_904": {
      "node_id": "node_904",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.11 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1064524941291,
      "fos_buckling": 1.5224148177589205,
      "fos_yielding": 2.0115947193981176,
      "deflection": 0.0040423367612493575,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.152)"
      },
      "parent_node_id": "node_903",
      "improvement_over_parent": null
    },
    "node_905": {
      "node_id": "node_905",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_904",
      "improvement_over_parent": null
    },
    "node_906": {
      "node_id": "node_906",
      "content": "INITIAL DESIGN (Trace 130)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 172.26 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.04e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.26235555396337,
      "fos_buckling": 0.43031633950026826,
      "fos_yielding": 1.3149307568673891,
      "deflection": 0.010394963720290095,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_907": {
      "node_id": "node_907",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 201.43 kg\n  Factor of Safety: 0.49\n  Max Deflection: 8.90e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.42673440557513,
      "fos_buckling": 0.4922053292859922,
      "fos_yielding": 1.5351231469304036,
      "deflection": 0.00890490685666688,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.182)"
      },
      "parent_node_id": "node_906",
      "improvement_over_parent": null
    },
    "node_908": {
      "node_id": "node_908",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n\nPerformance:\n  Mass: 236.21 kg\n  Factor of Safety: 1.27\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.21184355700686,
      "fos_buckling": 1.2739630206589942,
      "fos_yielding": 1.6233342480254482,
      "deflection": 0.004999467107571777,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004873)"
      },
      "parent_node_id": "node_907",
      "improvement_over_parent": null
    },
    "node_909": {
      "node_id": "node_909",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.43 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.43450994913167,
      "fos_buckling": 1.5238249803731214,
      "fos_yielding": 2.013987470892367,
      "deflection": 0.0040379008789674644,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.266)"
      },
      "parent_node_id": "node_908",
      "improvement_over_parent": null
    },
    "node_910": {
      "node_id": "node_910",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_909",
      "improvement_over_parent": null
    },
    "node_911": {
      "node_id": "node_911",
      "content": "INITIAL DESIGN (Trace 131)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 189.42 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.37e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.42228918604815,
      "fos_buckling": 0.8400294359428154,
      "fos_yielding": 1.834577264580653,
      "deflection": 0.007371687200761587,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_912": {
      "node_id": "node_912",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 236.35 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.93e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.35047689577698,
      "fos_buckling": 1.0088125188212647,
      "fos_yielding": 2.2881120977253206,
      "deflection": 0.005928549583824566,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_911",
      "improvement_over_parent": null
    },
    "node_913": {
      "node_id": "node_913",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 262.25 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.24791403816675,
      "fos_buckling": 1.072604119688411,
      "fos_yielding": 2.2881120977253206,
      "deflection": 0.004851324431827347,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_912",
      "improvement_over_parent": null
    },
    "node_914": {
      "node_id": "node_914",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22646008724314,
      "fos_buckling": 1.5228938449678717,
      "fos_yielding": 2.012481555149479,
      "deflection": 0.004040667167501362,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_913",
      "improvement_over_parent": null
    },
    "node_915": {
      "node_id": "node_915",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_914",
      "improvement_over_parent": null
    },
    "node_916": {
      "node_id": "node_916",
      "content": "INITIAL DESIGN (Trace 132)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_917": {
      "node_id": "node_917",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 225.65 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.83e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.6452106884099,
      "fos_buckling": 0.5893898008204329,
      "fos_yielding": 1.9022261790645885,
      "deflection": 0.007834986126196729,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_916",
      "improvement_over_parent": null
    },
    "node_918": {
      "node_id": "node_918",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 250.03 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.026682649242,
      "fos_buckling": 0.588404257548681,
      "fos_yielding": 1.9005332709357854,
      "deflection": 0.007194086053073488,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_917",
      "improvement_over_parent": null
    },
    "node_919": {
      "node_id": "node_919",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2247405866942,
      "fos_buckling": 1.5228703082961736,
      "fos_yielding": 2.012446812636766,
      "deflection": 0.004040692938362698,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_918",
      "improvement_over_parent": null
    },
    "node_920": {
      "node_id": "node_920",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_919",
      "improvement_over_parent": null
    },
    "node_921": {
      "node_id": "node_921",
      "content": "INITIAL DESIGN (Trace 133)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 185.43 kg\n  Factor of Safety: 0.33\n  Max Deflection: 2.65e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.4342734575897,
      "fos_buckling": 0.3298593943317397,
      "fos_yielding": 1.4476748641826913,
      "deflection": 0.026503511204007898,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_922": {
      "node_id": "node_922",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n\nPerformance:\n  Mass: 219.40 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.46e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.4016993704338,
      "fos_buckling": 0.8472287761093535,
      "fos_yielding": 1.8071472012364937,
      "deflection": 0.007457949121782193,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004750)"
      },
      "parent_node_id": "node_921",
      "improvement_over_parent": null
    },
    "node_923": {
      "node_id": "node_923",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n\nPerformance:\n  Mass: 247.37 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.62e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.369961906222,
      "fos_buckling": 0.9375442855316741,
      "fos_yielding": 2.0353656387403887,
      "deflection": 0.00662212917421627,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_922",
      "improvement_over_parent": null
    },
    "node_924": {
      "node_id": "node_924",
      "content": "MODIFICATION: Increase 2 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n\nPerformance:\n  Mass: 255.28 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.63e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.28151074844146,
      "fos_buckling": 0.9387337102605586,
      "fos_yielding": 2.037009266487715,
      "deflection": 0.006625567254916239,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.570)"
      },
      "parent_node_id": "node_923",
      "improvement_over_parent": null
    },
    "node_925": {
      "node_id": "node_925",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 288.27 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.87e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.2693982181074,
      "fos_buckling": 1.0374359174371957,
      "fos_yielding": 2.298079750180907,
      "deflection": 0.005873794537615074,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.142)"
      },
      "parent_node_id": "node_924",
      "improvement_over_parent": null
    },
    "node_926": {
      "node_id": "node_926",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.48 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4832282519215,
      "fos_buckling": 1.523991223791206,
      "fos_yielding": 2.014374343419146,
      "deflection": 0.00403725377229114,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_925",
      "improvement_over_parent": null
    },
    "node_927": {
      "node_id": "node_927",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_926",
      "improvement_over_parent": null
    },
    "node_928": {
      "node_id": "node_928",
      "content": "INITIAL DESIGN (Trace 134)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0016)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n\nPerformance:\n  Mass: 126.92 kg\n  Factor of Safety: 0.31\n  Max Deflection: 1.42e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 126.92167774834087,
      "fos_buckling": 0.30934561925898474,
      "fos_yielding": 0.8581450736319579,
      "deflection": 0.014166609046453081,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_929": {
      "node_id": "node_929",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 147.65 kg\n  Factor of Safety: 0.35\n  Max Deflection: 1.22e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.6480610364566,
      "fos_buckling": 0.35393532336379685,
      "fos_yielding": 0.9972274925257429,
      "deflection": 0.012193928092100141,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.172)"
      },
      "parent_node_id": "node_928",
      "improvement_over_parent": null
    },
    "node_930": {
      "node_id": "node_930",
      "content": "MODIFICATION: Increase 2 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 150.63 kg\n  Factor of Safety: 0.35\n  Max Deflection: 1.21e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 150.63456158040339,
      "fos_buckling": 0.35386235408821415,
      "fos_yielding": 0.9971636961948853,
      "deflection": 0.012096315647214124,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.300)"
      },
      "parent_node_id": "node_929",
      "improvement_over_parent": null
    },
    "node_931": {
      "node_id": "node_931",
      "content": "MODIFICATION: Increase 0 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 154.18 kg\n  Factor of Safety: 0.35\n  Max Deflection: 1.19e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 154.18129062750785,
      "fos_buckling": 0.35377573580273675,
      "fos_yielding": 0.99708794310761,
      "deflection": 0.011895722410199663,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.209)"
      },
      "parent_node_id": "node_930",
      "improvement_over_parent": null
    },
    "node_932": {
      "node_id": "node_932",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 182.37 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.43e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.37084383916766,
      "fos_buckling": 1.0092115839214995,
      "fos_yielding": 1.2748685259250006,
      "deflection": 0.0064284780096968515,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003826)"
      },
      "parent_node_id": "node_931",
      "improvement_over_parent": null
    },
    "node_933": {
      "node_id": "node_933",
      "content": "MODIFICATION: Increase 2 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 185.35 kg\n  Factor of Safety: 1.03\n  Max Deflection: 6.35e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.34919625429745,
      "fos_buckling": 1.0330473167254195,
      "fos_yielding": 1.2752999387693797,
      "deflection": 0.006352466328052404,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.235)"
      },
      "parent_node_id": "node_932",
      "improvement_over_parent": null
    },
    "node_934": {
      "node_id": "node_934",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 227.56 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.5588001911898,
      "fos_buckling": 1.2344471293754984,
      "fos_yielding": 1.564231150266878,
      "deflection": 0.005186883091737165,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.244)"
      },
      "parent_node_id": "node_933",
      "improvement_over_parent": null
    },
    "node_935": {
      "node_id": "node_935",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.07 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0737546844925,
      "fos_buckling": 1.52258330278587,
      "fos_yielding": 2.0116009128155485,
      "deflection": 0.0040427245251822,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.316)"
      },
      "parent_node_id": "node_934",
      "improvement_over_parent": null
    },
    "node_936": {
      "node_id": "node_936",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_935",
      "improvement_over_parent": null
    },
    "node_937": {
      "node_id": "node_937",
      "content": "INITIAL DESIGN (Trace 135)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0011)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0019)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 130.58 kg\n  Factor of Safety: 0.37\n  Max Deflection: 1.45e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 130.58045243296806,
      "fos_buckling": 0.3710272618460172,
      "fos_yielding": 1.1130319110295257,
      "deflection": 0.014455825196147411,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_938": {
      "node_id": "node_938",
      "content": "MODIFICATION: Increase 3 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0017)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0019)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 133.86 kg\n  Factor of Safety: 0.37\n  Max Deflection: 1.43e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 133.8561615860814,
      "fos_buckling": 0.37094326748325807,
      "fos_yielding": 1.112897950065416,
      "deflection": 0.014302697182313093,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.575)"
      },
      "parent_node_id": "node_937",
      "improvement_over_parent": null
    },
    "node_939": {
      "node_id": "node_939",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 165.15 kg\n  Factor of Safety: 0.45\n  Max Deflection: 1.16e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.14877331458428,
      "fos_buckling": 0.44602069289742224,
      "fos_yielding": 1.3698110984374228,
      "deflection": 0.011601401329489414,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.248)"
      },
      "parent_node_id": "node_938",
      "improvement_over_parent": null
    },
    "node_940": {
      "node_id": "node_940",
      "content": "MODIFICATION: Increase 7 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 173.17 kg\n  Factor of Safety: 0.45\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.17280952802082,
      "fos_buckling": 0.44577400020867175,
      "fos_yielding": 1.3686026019571365,
      "deflection": 0.010093519797019621,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.548)"
      },
      "parent_node_id": "node_939",
      "improvement_over_parent": null
    },
    "node_941": {
      "node_id": "node_941",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 212.73 kg\n  Factor of Safety: 0.53\n  Max Deflection: 8.24e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.73400075801118,
      "fos_buckling": 0.5306667091763781,
      "fos_yielding": 1.6769751740792127,
      "deflection": 0.008237218521097506,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.247)"
      },
      "parent_node_id": "node_940",
      "improvement_over_parent": null
    },
    "node_942": {
      "node_id": "node_942",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n\nPerformance:\n  Mass: 250.80 kg\n  Factor of Safety: 1.23\n  Max Deflection: 4.69e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.7977946104473,
      "fos_buckling": 1.2313258289241562,
      "fos_yielding": 1.799860123908967,
      "deflection": 0.004685828759522618,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005371)"
      },
      "parent_node_id": "node_941",
      "improvement_over_parent": null
    },
    "node_943": {
      "node_id": "node_943",
      "content": "MODIFICATION: Increase 3 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n\nPerformance:\n  Mass: 258.30 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.58e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.29842624931644,
      "fos_buckling": 1.372954897739173,
      "fos_yielding": 1.7737072100914901,
      "deflection": 0.004577980391258669,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.580)"
      },
      "parent_node_id": "node_942",
      "improvement_over_parent": null
    },
    "node_944": {
      "node_id": "node_944",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.09 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0933942464984,
      "fos_buckling": 1.5222756957235517,
      "fos_yielding": 2.011069367658805,
      "deflection": 0.00404264315595374,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.148)"
      },
      "parent_node_id": "node_943",
      "improvement_over_parent": null
    },
    "node_945": {
      "node_id": "node_945",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_944",
      "improvement_over_parent": null
    },
    "node_946": {
      "node_id": "node_946",
      "content": "INITIAL DESIGN (Trace 136)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 209.74 kg\n  Factor of Safety: 0.70\n  Max Deflection: 6.64e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.7356588754436,
      "fos_buckling": 0.7002364495623362,
      "fos_yielding": 1.6209487559948552,
      "deflection": 0.006642590623502473,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_947": {
      "node_id": "node_947",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 230.71 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.16e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.71494069067336,
      "fos_buckling": 1.1157233623459366,
      "fos_yielding": 1.6335661906047885,
      "deflection": 0.005159465430643083,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003986)"
      },
      "parent_node_id": "node_946",
      "improvement_over_parent": null
    },
    "node_948": {
      "node_id": "node_948",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 285.07 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.19e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.0659273355102,
      "fos_buckling": 1.3410601176907997,
      "fos_yielding": 2.0148607707684607,
      "deflection": 0.0041879529718220525,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.258)"
      },
      "parent_node_id": "node_947",
      "improvement_over_parent": null
    },
    "node_949": {
      "node_id": "node_949",
      "content": "MODIFICATION: Increase 7 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0068)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 292.67 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.67359538353116,
      "fos_buckling": 1.3832445545956062,
      "fos_yielding": 2.0155083747079496,
      "deflection": 0.004126840901235657,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.261)"
      },
      "parent_node_id": "node_948",
      "improvement_over_parent": null
    },
    "node_950": {
      "node_id": "node_950",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_949",
      "improvement_over_parent": null
    },
    "node_951": {
      "node_id": "node_951",
      "content": "INITIAL DESIGN (Trace 137)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 202.36 kg\n  Factor of Safety: 0.94\n  Max Deflection: 5.95e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 202.36145100451313,
      "fos_buckling": 0.9401869868578854,
      "fos_yielding": 1.4868497023560192,
      "deflection": 0.005947600143065013,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_952": {
      "node_id": "node_952",
      "content": "MODIFICATION: Increase 1 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 207.15 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.82e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.14620926343923,
      "fos_buckling": 0.9091130154484599,
      "fos_yielding": 1.4986065030905074,
      "deflection": 0.005815938889227424,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.232)"
      },
      "parent_node_id": "node_951",
      "improvement_over_parent": null
    },
    "node_953": {
      "node_id": "node_953",
      "content": "MODIFICATION: Increase 2 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 212.01 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.73e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.01256560641502,
      "fos_buckling": 0.9071498425312775,
      "fos_yielding": 1.4992012310232945,
      "deflection": 0.005728476970485257,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.348)"
      },
      "parent_node_id": "node_952",
      "improvement_over_parent": null
    },
    "node_954": {
      "node_id": "node_954",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 241.67 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.03e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.67467538539876,
      "fos_buckling": 1.022922386393648,
      "fos_yielding": 1.7075020389836608,
      "deflection": 0.005031954166599929,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.151)"
      },
      "parent_node_id": "node_953",
      "improvement_over_parent": null
    },
    "node_955": {
      "node_id": "node_955",
      "content": "MODIFICATION: Increase 10 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 248.43 kg\n  Factor of Safety: 1.19\n  Max Deflection: 4.80e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.43143299480283,
      "fos_buckling": 1.1908113236051758,
      "fos_yielding": 1.73495875329399,
      "deflection": 0.004800536858325405,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.290)"
      },
      "parent_node_id": "node_954",
      "improvement_over_parent": null
    },
    "node_956": {
      "node_id": "node_956",
      "content": "MODIFICATION: Increase 10 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 255.77 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.62e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.77499395451284,
      "fos_buckling": 1.3616895912585638,
      "fos_yielding": 1.7567660248454977,
      "deflection": 0.0046222231073768235,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.252)"
      },
      "parent_node_id": "node_955",
      "improvement_over_parent": null
    },
    "node_957": {
      "node_id": "node_957",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.25727790020267,
      "fos_buckling": 1.5228275322140605,
      "fos_yielding": 2.0125114313007333,
      "deflection": 0.004040210504873515,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.161)"
      },
      "parent_node_id": "node_956",
      "improvement_over_parent": null
    },
    "node_958": {
      "node_id": "node_958",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_957",
      "improvement_over_parent": null
    },
    "node_959": {
      "node_id": "node_959",
      "content": "INITIAL DESIGN (Trace 138)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 181.22 kg\n  Factor of Safety: 0.80\n  Max Deflection: 7.15e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.2249973640354,
      "fos_buckling": 0.8025263910581916,
      "fos_yielding": 1.6177734441498461,
      "deflection": 0.007148411860406134,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_960": {
      "node_id": "node_960",
      "content": "MODIFICATION: Increase 4 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 182.38 kg\n  Factor of Safety: 0.80\n  Max Deflection: 7.11e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.38456937727258,
      "fos_buckling": 0.8023981827812039,
      "fos_yielding": 1.6177734441498457,
      "deflection": 0.007105720130611937,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.488)"
      },
      "parent_node_id": "node_959",
      "improvement_over_parent": null
    },
    "node_961": {
      "node_id": "node_961",
      "content": "MODIFICATION: Increase 6 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 190.03 kg\n  Factor of Safety: 0.80\n  Max Deflection: 6.83e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.0259720761558,
      "fos_buckling": 0.8019760359839887,
      "fos_yielding": 1.6177734441498461,
      "deflection": 0.0068318462143238815,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.355)"
      },
      "parent_node_id": "node_960",
      "improvement_over_parent": null
    },
    "node_962": {
      "node_id": "node_962",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n\nPerformance:\n  Mass: 207.26 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.69e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.25804278220184,
      "fos_buckling": 1.138837134555378,
      "fos_yielding": 1.4251701076507866,
      "deflection": 0.005688192160746909,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003342)"
      },
      "parent_node_id": "node_961",
      "improvement_over_parent": null
    },
    "node_963": {
      "node_id": "node_963",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 262.46 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.51e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.464998711211,
      "fos_buckling": 1.3913186510381779,
      "fos_yielding": 1.8025450376846686,
      "deflection": 0.0045061700653417774,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.289)"
      },
      "parent_node_id": "node_962",
      "improvement_over_parent": null
    },
    "node_964": {
      "node_id": "node_964",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.51 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.5121342453579,
      "fos_buckling": 1.5240632868867299,
      "fos_yielding": 2.0143599464710915,
      "deflection": 0.004036774878896448,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.130)"
      },
      "parent_node_id": "node_963",
      "improvement_over_parent": null
    },
    "node_965": {
      "node_id": "node_965",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_964",
      "improvement_over_parent": null
    },
    "node_966": {
      "node_id": "node_966",
      "content": "INITIAL DESIGN (Trace 139)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 217.45 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.41e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.45346275145516,
      "fos_buckling": 0.47859062287474236,
      "fos_yielding": 1.415688514467393,
      "deflection": 0.008406285552847685,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_967": {
      "node_id": "node_967",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 241.66 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.58e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.65747229207258,
      "fos_buckling": 0.5214980156674938,
      "fos_yielding": 1.5716571636716805,
      "deflection": 0.0075760479152586595,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.122)"
      },
      "parent_node_id": "node_966",
      "improvement_over_parent": null
    },
    "node_968": {
      "node_id": "node_968",
      "content": "MODIFICATION: Increase 8 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 248.43 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.53e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.43095523619698,
      "fos_buckling": 0.5212557314503783,
      "fos_yielding": 1.5714298136434792,
      "deflection": 0.0075262631260875085,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.285)"
      },
      "parent_node_id": "node_967",
      "improvement_over_parent": null
    },
    "node_969": {
      "node_id": "node_969",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.01 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0128864041429,
      "fos_buckling": 1.5226938465515374,
      "fos_yielding": 2.011001807645589,
      "deflection": 0.00404337508792708,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_968",
      "improvement_over_parent": null
    },
    "node_970": {
      "node_id": "node_970",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_969",
      "improvement_over_parent": null
    },
    "node_971": {
      "node_id": "node_971",
      "content": "INITIAL DESIGN (Trace 140)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_972": {
      "node_id": "node_972",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n\nPerformance:\n  Mass: 142.06 kg\n  Factor of Safety: 0.61\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 142.05959821149204,
      "fos_buckling": 0.6123235331909301,
      "fos_yielding": 0.950771104122812,
      "deflection": 0.010239691603097423,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.002886)"
      },
      "parent_node_id": "node_971",
      "improvement_over_parent": null
    },
    "node_973": {
      "node_id": "node_973",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n\nPerformance:\n  Mass: 156.53 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.72e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 156.5341789393838,
      "fos_buckling": 0.8545813684882438,
      "fos_yielding": 0.9587208236547388,
      "deflection": 0.007720549901988838,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002688)"
      },
      "parent_node_id": "node_972",
      "improvement_over_parent": null
    },
    "node_974": {
      "node_id": "node_974",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n\nPerformance:\n  Mass: 193.90 kg\n  Factor of Safety: 1.04\n  Max Deflection: 6.24e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.89503402279857,
      "fos_buckling": 1.0394538124899935,
      "fos_yielding": 1.1883440483163965,
      "deflection": 0.006243915607273338,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.253)"
      },
      "parent_node_id": "node_973",
      "improvement_over_parent": null
    },
    "node_975": {
      "node_id": "node_975",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n\nPerformance:\n  Mass: 231.97 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.9692981145783,
      "fos_buckling": 1.2202562951216454,
      "fos_yielding": 1.422777898343307,
      "deflection": 0.0052283467363929215,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.211)"
      },
      "parent_node_id": "node_974",
      "improvement_over_parent": null
    },
    "node_976": {
      "node_id": "node_976",
      "content": "MODIFICATION: Increase 0 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n\nPerformance:\n  Mass: 241.37 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.91e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.3726689647325,
      "fos_buckling": 1.218671254333995,
      "fos_yielding": 1.4209297939658436,
      "deflection": 0.004910983966235201,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.541)"
      },
      "parent_node_id": "node_975",
      "improvement_over_parent": null
    },
    "node_977": {
      "node_id": "node_977",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 291.73 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.07e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.73043925724613,
      "fos_buckling": 1.4377135433159316,
      "fos_yielding": 1.7201205555541499,
      "deflection": 0.004074821588482604,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.229)"
      },
      "parent_node_id": "node_976",
      "improvement_over_parent": null
    },
    "node_978": {
      "node_id": "node_978",
      "content": "MODIFICATION: Increase 6 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0074)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 299.16 kg\n  Factor of Safety: 1.44\n  Max Deflection: 3.98e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 299.1631804684539,
      "fos_buckling": 1.4369604150830386,
      "fos_yielding": 1.7192194919449284,
      "deflection": 0.003975409699915571,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.193)"
      },
      "parent_node_id": "node_977",
      "improvement_over_parent": null
    },
    "node_979": {
      "node_id": "node_979",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_978",
      "improvement_over_parent": null
    },
    "node_980": {
      "node_id": "node_980",
      "content": "INITIAL DESIGN (Trace 141)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 227.12 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.54e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.12475544781617,
      "fos_buckling": 0.9347250775533278,
      "fos_yielding": 2.054543311714708,
      "deflection": 0.006544008018935678,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_981": {
      "node_id": "node_981",
      "content": "MODIFICATION: Increase 3 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 230.70 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.55e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.70092204901667,
      "fos_buckling": 0.934492542276715,
      "fos_yielding": 2.0540866173722496,
      "deflection": 0.006545626261096226,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.212)"
      },
      "parent_node_id": "node_980",
      "improvement_over_parent": null
    },
    "node_982": {
      "node_id": "node_982",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 256.94 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.9441881411337,
      "fos_buckling": 1.021718687113763,
      "fos_yielding": 2.287250159186962,
      "deflection": 0.0058827405926194865,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.125)"
      },
      "parent_node_id": "node_981",
      "improvement_over_parent": null
    },
    "node_983": {
      "node_id": "node_983",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 287.92 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.92273419021006,
      "fos_buckling": 1.0363368197581062,
      "fos_yielding": 2.295086455525959,
      "deflection": 0.005881441692454051,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_982",
      "improvement_over_parent": null
    },
    "node_984": {
      "node_id": "node_984",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.13656422402414,
      "fos_buckling": 1.5225606303706245,
      "fos_yielding": 2.0116768935403497,
      "deflection": 0.004041961815354433,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_983",
      "improvement_over_parent": null
    },
    "node_985": {
      "node_id": "node_985",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_984",
      "improvement_over_parent": null
    },
    "node_986": {
      "node_id": "node_986",
      "content": "INITIAL DESIGN (Trace 142)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 177.49 kg\n  Factor of Safety: 0.82\n  Max Deflection: 7.63e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.48907485937383,
      "fos_buckling": 0.8151659704748748,
      "fos_yielding": 1.4322447722287381,
      "deflection": 0.007632960496137137,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_987": {
      "node_id": "node_987",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n\nPerformance:\n  Mass: 193.45 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.49e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.45105353038966,
      "fos_buckling": 0.8672993631163644,
      "fos_yielding": 1.4322447722287384,
      "deflection": 0.006489887412987728,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.002489)"
      },
      "parent_node_id": "node_986",
      "improvement_over_parent": null
    },
    "node_988": {
      "node_id": "node_988",
      "content": "MODIFICATION: Increase 2 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n\nPerformance:\n  Mass: 196.98 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.44e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.9814672053226,
      "fos_buckling": 0.8670886620581031,
      "fos_yielding": 1.4322447722287384,
      "deflection": 0.006441725198308202,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.229)"
      },
      "parent_node_id": "node_987",
      "improvement_over_parent": null
    },
    "node_989": {
      "node_id": "node_989",
      "content": "MODIFICATION: Increase 7 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0065)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n\nPerformance:\n  Mass: 210.56 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.45e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.56296106687796,
      "fos_buckling": 0.8662790491093066,
      "fos_yielding": 1.4310366577432208,
      "deflection": 0.00644730107010148,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.637)"
      },
      "parent_node_id": "node_988",
      "improvement_over_parent": null
    },
    "node_990": {
      "node_id": "node_990",
      "content": "MODIFICATION: Increase 5 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0065)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n\nPerformance:\n  Mass: 212.04 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.45e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.03626538815132,
      "fos_buckling": 0.8662790491093071,
      "fos_yielding": 1.7688806748539663,
      "deflection": 0.006447301070101479,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.253)"
      },
      "parent_node_id": "node_989",
      "improvement_over_parent": null
    },
    "node_991": {
      "node_id": "node_991",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0065)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n\nPerformance:\n  Mass: 230.89 kg\n  Factor of Safety: 1.15\n  Max Deflection: 5.26e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.89456572287384,
      "fos_buckling": 1.1464117167358723,
      "fos_yielding": 1.5347969146683034,
      "deflection": 0.005256411466639262,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003680)"
      },
      "parent_node_id": "node_990",
      "improvement_over_parent": null
    },
    "node_992": {
      "node_id": "node_992",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0085)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 297.85 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 297.84504920392453,
      "fos_buckling": 1.4199493693818128,
      "fos_yielding": 1.9811287685828254,
      "deflection": 0.004083080608856162,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.321)"
      },
      "parent_node_id": "node_991",
      "improvement_over_parent": null
    },
    "node_993": {
      "node_id": "node_993",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_992",
      "improvement_over_parent": null
    },
    "node_994": {
      "node_id": "node_994",
      "content": "INITIAL DESIGN (Trace 143)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 144.63 kg\n  Factor of Safety: 0.67\n  Max Deflection: 9.61e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 144.630596719881,
      "fos_buckling": 0.6655454867042196,
      "fos_yielding": 1.4034296241837052,
      "deflection": 0.00960561606065775,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_995": {
      "node_id": "node_995",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n\nPerformance:\n  Mass: 159.58 kg\n  Factor of Safety: 0.66\n  Max Deflection: 8.12e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.57561342238685,
      "fos_buckling": 0.6648592831968418,
      "fos_yielding": 1.2281996503902066,
      "deflection": 0.008117015921349884,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002874)"
      },
      "parent_node_id": "node_994",
      "improvement_over_parent": null
    },
    "node_996": {
      "node_id": "node_996",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n\nPerformance:\n  Mass: 183.13 kg\n  Factor of Safety: 0.75\n  Max Deflection: 7.08e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.12734717920208,
      "fos_buckling": 0.7501858157123292,
      "fos_yielding": 1.408665186721827,
      "deflection": 0.007083478404908177,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.157)"
      },
      "parent_node_id": "node_995",
      "improvement_over_parent": null
    },
    "node_997": {
      "node_id": "node_997",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n\nPerformance:\n  Mass: 202.60 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.41e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 202.59850061461023,
      "fos_buckling": 0.8182756083915554,
      "fos_yielding": 1.557707768662134,
      "deflection": 0.006410462496258587,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.114)"
      },
      "parent_node_id": "node_996",
      "improvement_over_parent": null
    },
    "node_998": {
      "node_id": "node_998",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 228.22 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.17e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.21558994989638,
      "fos_buckling": 1.2371639946961588,
      "fos_yielding": 1.5685633548828697,
      "deflection": 0.005172213677193946,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004101)"
      },
      "parent_node_id": "node_997",
      "improvement_over_parent": null
    },
    "node_999": {
      "node_id": "node_999",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.09 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0863695836481,
      "fos_buckling": 1.5222786947809142,
      "fos_yielding": 2.0114874992401504,
      "deflection": 0.004042599631124414,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.312)"
      },
      "parent_node_id": "node_998",
      "improvement_over_parent": null
    },
    "node_1000": {
      "node_id": "node_1000",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_999",
      "improvement_over_parent": null
    },
    "node_1001": {
      "node_id": "node_1001",
      "content": "INITIAL DESIGN (Trace 144)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 242.93 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.54e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.93272683098604,
      "fos_buckling": 0.9447968880450471,
      "fos_yielding": 2.059805279508759,
      "deflection": 0.006544381034386346,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1002": {
      "node_id": "node_1002",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 247.61 kg\n  Factor of Safety: 1.25\n  Max Deflection: 4.75e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.61307348247203,
      "fos_buckling": 1.2464718908311454,
      "fos_yielding": 1.8047466038699487,
      "deflection": 0.004745783444960931,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002938)"
      },
      "parent_node_id": "node_1001",
      "improvement_over_parent": null
    },
    "node_1003": {
      "node_id": "node_1003",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 275.87 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.27e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 275.86907357925753,
      "fos_buckling": 1.3620349970517245,
      "fos_yielding": 2.0087550481437515,
      "deflection": 0.004266290662821435,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.125)"
      },
      "parent_node_id": "node_1002",
      "improvement_over_parent": null
    },
    "node_1004": {
      "node_id": "node_1004",
      "content": "MODIFICATION: Increase 8 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0070)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 285.33 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.21e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.3263628883751,
      "fos_buckling": 1.3595922907852918,
      "fos_yielding": 1.9900113948007634,
      "deflection": 0.0042069502493579155,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.348)"
      },
      "parent_node_id": "node_1003",
      "improvement_over_parent": null
    },
    "node_1005": {
      "node_id": "node_1005",
      "content": "MODIFICATION: Increase 8 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0115)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 305.80 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 305.8034165028694,
      "fos_buckling": 1.3557984025583343,
      "fos_yielding": 1.9653046072523832,
      "deflection": 0.00413249346575598,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.639)"
      },
      "parent_node_id": "node_1004",
      "improvement_over_parent": null
    },
    "node_1006": {
      "node_id": "node_1006",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1005",
      "improvement_over_parent": null
    },
    "node_1007": {
      "node_id": "node_1007",
      "content": "INITIAL DESIGN (Trace 145)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 151.89 kg\n  Factor of Safety: 0.32\n  Max Deflection: 9.14e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.8891399073822,
      "fos_buckling": 0.32053627826856335,
      "fos_yielding": 0.550401609858168,
      "deflection": 91416479371295.14,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1008": {
      "node_id": "node_1008",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 181.63 kg\n  Factor of Safety: 0.54\n  Max Deflection: 9.01e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.633951975502,
      "fos_buckling": 0.5435227529792371,
      "fos_yielding": 1.7226918598851024,
      "deflection": 0.009014167692349596,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004819)"
      },
      "parent_node_id": "node_1007",
      "improvement_over_parent": null
    },
    "node_1009": {
      "node_id": "node_1009",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 209.63 kg\n  Factor of Safety: 0.54\n  Max Deflection: 8.12e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.63159148965576,
      "fos_buckling": 0.5424762915371675,
      "fos_yielding": 1.7209279990223858,
      "deflection": 0.008117924972920307,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004675)"
      },
      "parent_node_id": "node_1008",
      "improvement_over_parent": null
    },
    "node_1010": {
      "node_id": "node_1010",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n\nPerformance:\n  Mass: 248.67 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.91e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.67290370705837,
      "fos_buckling": 1.3749381467953516,
      "fos_yielding": 1.8014498880929368,
      "deflection": 0.004906221119784895,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005521)"
      },
      "parent_node_id": "node_1009",
      "improvement_over_parent": null
    },
    "node_1011": {
      "node_id": "node_1011",
      "content": "MODIFICATION: Increase 1 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n\nPerformance:\n  Mass: 254.92 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.75e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.92352376343962,
      "fos_buckling": 1.369125342111578,
      "fos_yielding": 1.82224141703951,
      "deflection": 0.004747146895461314,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.267)"
      },
      "parent_node_id": "node_1010",
      "improvement_over_parent": null
    },
    "node_1012": {
      "node_id": "node_1012",
      "content": "MODIFICATION: Increase 0 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n\nPerformance:\n  Mass: 264.99 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.46e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.9862425305734,
      "fos_buckling": 1.4026066513409023,
      "fos_yielding": 1.8199154502226595,
      "deflection": 0.004464111721565554,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.529)"
      },
      "parent_node_id": "node_1011",
      "improvement_over_parent": null
    },
    "node_1013": {
      "node_id": "node_1013",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1980561083396,
      "fos_buckling": 1.5230300777520394,
      "fos_yielding": 2.012391765698755,
      "deflection": 0.004041171746231742,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.117)"
      },
      "parent_node_id": "node_1012",
      "improvement_over_parent": null
    },
    "node_1014": {
      "node_id": "node_1014",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1013",
      "improvement_over_parent": null
    },
    "node_1015": {
      "node_id": "node_1015",
      "content": "INITIAL DESIGN (Trace 146)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0021)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 157.46 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.40e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.4636306312886,
      "fos_buckling": 0.8807873568340119,
      "fos_yielding": 1.1136038672426332,
      "deflection": 0.007404714163495126,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1016": {
      "node_id": "node_1016",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 200.47 kg\n  Factor of Safety: 1.09\n  Max Deflection: 5.83e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.471202993411,
      "fos_buckling": 1.0906014238574648,
      "fos_yielding": 1.4159403876366812,
      "deflection": 0.0058311633357690665,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.290)"
      },
      "parent_node_id": "node_1015",
      "improvement_over_parent": null
    },
    "node_1017": {
      "node_id": "node_1017",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 235.52 kg\n  Factor of Safety: 1.25\n  Max Deflection: 4.97e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.5201897190617,
      "fos_buckling": 1.2519862807547286,
      "fos_yielding": 1.6617347655321384,
      "deflection": 0.004973817137127981,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.188)"
      },
      "parent_node_id": "node_1016",
      "improvement_over_parent": null
    },
    "node_1018": {
      "node_id": "node_1018",
      "content": "MODIFICATION: Increase 8 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 241.96 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.88e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.9643068925937,
      "fos_buckling": 1.300050850574616,
      "fos_yielding": 1.6625626299867442,
      "deflection": 0.004882191485953612,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.335)"
      },
      "parent_node_id": "node_1017",
      "improvement_over_parent": null
    },
    "node_1019": {
      "node_id": "node_1019",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.09 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0854899233739,
      "fos_buckling": 1.5223123063548656,
      "fos_yielding": 2.0115026545418457,
      "deflection": 0.004042587690536846,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.232)"
      },
      "parent_node_id": "node_1018",
      "improvement_over_parent": null
    },
    "node_1020": {
      "node_id": "node_1020",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1019",
      "improvement_over_parent": null
    },
    "node_1021": {
      "node_id": "node_1021",
      "content": "INITIAL DESIGN (Trace 147)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 250.81 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.21e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.81352652722134,
      "fos_buckling": 1.0076932365193922,
      "fos_yielding": 1.6826907288490096,
      "deflection": 0.005206643898889451,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1022": {
      "node_id": "node_1022",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 283.73 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.25e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.7260631588383,
      "fos_buckling": 1.4158190296638917,
      "fos_yielding": 1.6934604480665338,
      "deflection": 0.0042488403672699526,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1021",
      "improvement_over_parent": null
    },
    "node_1023": {
      "node_id": "node_1023",
      "content": "MODIFICATION: Increase 6 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 285.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.21e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 285.23586291619904,
      "fos_buckling": 1.5223778451114924,
      "fos_yielding": 1.9859792901582225,
      "deflection": 0.00421072440421509,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.196)"
      },
      "parent_node_id": "node_1022",
      "improvement_over_parent": null
    },
    "node_1024": {
      "node_id": "node_1024",
      "content": "MODIFICATION: Increase 1 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.25151386780743,
      "fos_buckling": 1.5227874580878549,
      "fos_yielding": 2.0132172173074308,
      "deflection": 0.004040269068257499,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.325)"
      },
      "parent_node_id": "node_1023",
      "improvement_over_parent": null
    },
    "node_1025": {
      "node_id": "node_1025",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1024",
      "improvement_over_parent": null
    },
    "node_1026": {
      "node_id": "node_1026",
      "content": "INITIAL DESIGN (Trace 148)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n\nPerformance:\n  Mass: 108.85 kg\n  Factor of Safety: 0.07\n  Max Deflection: 2.82e+14 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 108.84716792705889,
      "fos_buckling": 0.0695889778142084,
      "fos_yielding": 0.2908972842114598,
      "deflection": 282083474511581.4,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1027": {
      "node_id": "node_1027",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n\nPerformance:\n  Mass: 137.35 kg\n  Factor of Safety: 1.09\n  Max Deflection: 1.07e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 137.3514492489734,
      "fos_buckling": 1.0900711135444128,
      "fos_yielding": 1.8097058458258637,
      "deflection": 10689854874933.32,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.276)"
      },
      "parent_node_id": "node_1026",
      "improvement_over_parent": null
    },
    "node_1028": {
      "node_id": "node_1028",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 172.50 kg\n  Factor of Safety: 0.50\n  Max Deflection: 1.31e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.50440126081367,
      "fos_buckling": 0.49904570514513835,
      "fos_yielding": 1.1253073712763755,
      "deflection": 13078859573899.74,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.274)"
      },
      "parent_node_id": "node_1027",
      "improvement_over_parent": null
    },
    "node_1029": {
      "node_id": "node_1029",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 193.39 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.59e+12 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.39309265595162,
      "fos_buckling": 0.9819968582300961,
      "fos_yielding": 1.677429118386475,
      "deflection": 5587907996266.916,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.131)"
      },
      "parent_node_id": "node_1028",
      "improvement_over_parent": null
    },
    "node_1030": {
      "node_id": "node_1030",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 214.43 kg\n  Factor of Safety: 0.46\n  Max Deflection: 8.70e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.43489599195146,
      "fos_buckling": 0.4622871476211549,
      "fos_yielding": 1.357617144190381,
      "deflection": 0.008702369227750827,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004141)"
      },
      "parent_node_id": "node_1029",
      "improvement_over_parent": null
    },
    "node_1031": {
      "node_id": "node_1031",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 248.40 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.53e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.4035494983057,
      "fos_buckling": 0.5214709192187732,
      "fos_yielding": 1.5709927710499687,
      "deflection": 0.007526761610471437,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.174)"
      },
      "parent_node_id": "node_1030",
      "improvement_over_parent": null
    },
    "node_1032": {
      "node_id": "node_1032",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 286.08 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.17e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.07909687300287,
      "fos_buckling": 1.3725013646873512,
      "fos_yielding": 1.9905494176020073,
      "deflection": 0.00416759406023781,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005215)"
      },
      "parent_node_id": "node_1031",
      "improvement_over_parent": null
    },
    "node_1033": {
      "node_id": "node_1033",
      "content": "MODIFICATION: Increase 10 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.01 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0076683995269,
      "fos_buckling": 1.5231866666288363,
      "fos_yielding": 2.01048915400959,
      "deflection": 0.004043602634512072,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.202)"
      },
      "parent_node_id": "node_1032",
      "improvement_over_parent": null
    },
    "node_1034": {
      "node_id": "node_1034",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1033",
      "improvement_over_parent": null
    },
    "node_1035": {
      "node_id": "node_1035",
      "content": "INITIAL DESIGN (Trace 149)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0019)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 155.68 kg\n  Factor of Safety: 0.67\n  Max Deflection: 8.41e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.68365023078664,
      "fos_buckling": 0.6669908112340908,
      "fos_yielding": 0.9084195336968154,
      "deflection": 0.00841260177892541,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1036": {
      "node_id": "node_1036",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 174.34 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.34187311552614,
      "fos_buckling": 0.7365601531392706,
      "fos_yielding": 1.0185185451112366,
      "deflection": 0.007521243901649311,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.127)"
      },
      "parent_node_id": "node_1035",
      "improvement_over_parent": null
    },
    "node_1037": {
      "node_id": "node_1037",
      "content": "MODIFICATION: Increase 8 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 182.15 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.35e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.15018943955607,
      "fos_buckling": 0.7361640234446268,
      "fos_yielding": 1.001361027365538,
      "deflection": 0.007352558282644262,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.613)"
      },
      "parent_node_id": "node_1036",
      "improvement_over_parent": null
    },
    "node_1038": {
      "node_id": "node_1038",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 211.16 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.35e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.16404190671756,
      "fos_buckling": 0.8357668660825831,
      "fos_yielding": 1.163437345479593,
      "deflection": 0.0063531301004990295,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_1037",
      "improvement_over_parent": null
    },
    "node_1039": {
      "node_id": "node_1039",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 264.49 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.09e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.4876633672924,
      "fos_buckling": 1.0064019436349092,
      "fos_yielding": 1.463633412039405,
      "deflection": 0.005088090643273697,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.277)"
      },
      "parent_node_id": "node_1038",
      "improvement_over_parent": null
    },
    "node_1040": {
      "node_id": "node_1040",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 290.39 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.38510050968216,
      "fos_buckling": 1.2592530487638829,
      "fos_yielding": 1.474025053042324,
      "deflection": 0.004115095264663184,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1039",
      "improvement_over_parent": null
    },
    "node_1041": {
      "node_id": "node_1041",
      "content": "MODIFICATION: Increase 6 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0087)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 306.04 kg\n  Factor of Safety: 1.26\n  Max Deflection: 3.93e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 306.0373222884729,
      "fos_buckling": 1.2580046143077728,
      "fos_yielding": 1.4725636917478695,
      "deflection": 0.003930712916991525,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.416)"
      },
      "parent_node_id": "node_1040",
      "improvement_over_parent": null
    },
    "node_1042": {
      "node_id": "node_1042",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1041",
      "improvement_over_parent": null
    },
    "node_1043": {
      "node_id": "node_1043",
      "content": "INITIAL DESIGN (Trace 150)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 183.38 kg\n  Factor of Safety: 1.31\n  Max Deflection: 7.05e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.38078012142853,
      "fos_buckling": 1.3091902386905534,
      "fos_yielding": 2.288071782940979,
      "deflection": 7046620465550.969,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1044": {
      "node_id": "node_1044",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 227.96 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.92e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.9627112893744,
      "fos_buckling": 1.0094743701265694,
      "fos_yielding": 2.288071782940979,
      "deflection": 0.005923693073394402,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1043",
      "improvement_over_parent": null
    },
    "node_1045": {
      "node_id": "node_1045",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 258.94 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.02e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.9412573384508,
      "fos_buckling": 1.0073307641922695,
      "fos_yielding": 2.0032267957668712,
      "deflection": 0.00502272128611395,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1044",
      "improvement_over_parent": null
    },
    "node_1046": {
      "node_id": "node_1046",
      "content": "MODIFICATION: Increase 5 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 260.32 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.3166290731404,
      "fos_buckling": 1.0071408624582243,
      "fos_yielding": 1.9986569780237886,
      "deflection": 0.005007039862500054,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.393)"
      },
      "parent_node_id": "node_1045",
      "improvement_over_parent": null
    },
    "node_1047": {
      "node_id": "node_1047",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2291657047574,
      "fos_buckling": 1.5229094179893157,
      "fos_yielding": 2.012443231535083,
      "deflection": 0.004040623422147651,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1046",
      "improvement_over_parent": null
    },
    "node_1048": {
      "node_id": "node_1048",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1047",
      "improvement_over_parent": null
    },
    "node_1049": {
      "node_id": "node_1049",
      "content": "INITIAL DESIGN (Trace 151)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 247.07 kg\n  Factor of Safety: 0.79\n  Max Deflection: 5.51e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.0718574227491,
      "fos_buckling": 0.7929363708452881,
      "fos_yielding": 2.2883319338674015,
      "deflection": 0.005514249252577914,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1050": {
      "node_id": "node_1050",
      "content": "MODIFICATION: Increase 8 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 255.50 kg\n  Factor of Safety: 0.79\n  Max Deflection: 5.52e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.4995642463637,
      "fos_buckling": 0.7924782311330557,
      "fos_yielding": 2.2871339578139467,
      "deflection": 0.005517189174701056,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.410)"
      },
      "parent_node_id": "node_1049",
      "improvement_over_parent": null
    },
    "node_1051": {
      "node_id": "node_1051",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 279.88 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.32e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 279.8810362071958,
      "fos_buckling": 1.2230788808029498,
      "fos_yielding": 1.9686608328089283,
      "deflection": 0.004316079378218171,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1050",
      "improvement_over_parent": null
    },
    "node_1052": {
      "node_id": "node_1052",
      "content": "MODIFICATION: Increase 10 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0071)]\n\nPerformance:\n  Mass: 289.77 kg\n  Factor of Safety: 1.27\n  Max Deflection: 4.23e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.76889199971407,
      "fos_buckling": 1.2719476971348864,
      "fos_yielding": 1.9482033564401264,
      "deflection": 0.004232265589718115,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.468)"
      },
      "parent_node_id": "node_1051",
      "improvement_over_parent": null
    },
    "node_1053": {
      "node_id": "node_1053",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1052",
      "improvement_over_parent": null
    },
    "node_1054": {
      "node_id": "node_1054",
      "content": "INITIAL DESIGN (Trace 152)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0025)]\n\nPerformance:\n  Mass: 168.44 kg\n  Factor of Safety: 0.77\n  Max Deflection: 7.14e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.4444200257761,
      "fos_buckling": 0.7657971542508405,
      "fos_yielding": 1.189195608603908,
      "deflection": 0.007140527796890364,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1055": {
      "node_id": "node_1055",
      "content": "MODIFICATION: Increase 10 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 176.94 kg\n  Factor of Safety: 0.99\n  Max Deflection: 6.65e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.94113958647074,
      "fos_buckling": 0.9911953957824098,
      "fos_yielding": 1.217557440893932,
      "deflection": 0.0066511249757250064,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.486)"
      },
      "parent_node_id": "node_1054",
      "improvement_over_parent": null
    },
    "node_1056": {
      "node_id": "node_1056",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 229.60 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.5952538587783,
      "fos_buckling": 1.2435599618977156,
      "fos_yielding": 1.5780016233923255,
      "deflection": 0.005141528198367073,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.319)"
      },
      "parent_node_id": "node_1055",
      "improvement_over_parent": null
    },
    "node_1057": {
      "node_id": "node_1057",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.18 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1798452794228,
      "fos_buckling": 1.5227030434196482,
      "fos_yielding": 2.012130902000478,
      "deflection": 0.004041319076242367,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_1056",
      "improvement_over_parent": null
    },
    "node_1058": {
      "node_id": "node_1058",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1057",
      "improvement_over_parent": null
    },
    "node_1059": {
      "node_id": "node_1059",
      "content": "INITIAL DESIGN (Trace 153)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n\nPerformance:\n  Mass: 103.30 kg\n  Factor of Safety: 0.02\n  Max Deflection: 3.96e+14 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 103.30194410085028,
      "fos_buckling": 0.02478311232426433,
      "fos_yielding": 0.11382022028069896,
      "deflection": 395890630129254.06,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1060": {
      "node_id": "node_1060",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n\nPerformance:\n  Mass: 118.07 kg\n  Factor of Safety: 0.27\n  Max Deflection: 1.60e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 118.07147975649008,
      "fos_buckling": 0.27451190123173075,
      "fos_yielding": 0.7529646878484739,
      "deflection": 0.016014145155535422,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002372)"
      },
      "parent_node_id": "node_1059",
      "improvement_over_parent": null
    },
    "node_1061": {
      "node_id": "node_1061",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n\nPerformance:\n  Mass: 150.25 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.26e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 150.24810575887696,
      "fos_buckling": 0.34110909678930285,
      "fos_yielding": 0.957147668897753,
      "deflection": 0.012604222620009597,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.287)"
      },
      "parent_node_id": "node_1060",
      "improvement_over_parent": null
    },
    "node_1062": {
      "node_id": "node_1062",
      "content": "MODIFICATION: Increase 5 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n\nPerformance:\n  Mass: 150.86 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.23e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 150.85878851380426,
      "fos_buckling": 0.3410803375912136,
      "fos_yielding": 0.9571226257138874,
      "deflection": 0.012327275895659488,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.252)"
      },
      "parent_node_id": "node_1061",
      "improvement_over_parent": null
    },
    "node_1063": {
      "node_id": "node_1063",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n\nPerformance:\n  Mass: 184.07 kg\n  Factor of Safety: 0.41\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.06822577569943,
      "fos_buckling": 0.40591812401314903,
      "fos_yielding": 1.1665926346934072,
      "deflection": 0.010122207726096519,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.235)"
      },
      "parent_node_id": "node_1062",
      "improvement_over_parent": null
    },
    "node_1064": {
      "node_id": "node_1064",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 213.69 kg\n  Factor of Safety: 0.46\n  Max Deflection: 8.73e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.68882446456095,
      "fos_buckling": 0.46067325033609574,
      "fos_yielding": 1.3530548038425356,
      "deflection": 0.0087337162741166,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.174)"
      },
      "parent_node_id": "node_1063",
      "improvement_over_parent": null
    },
    "node_1065": {
      "node_id": "node_1065",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 251.99 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.69e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.99193734909213,
      "fos_buckling": 1.34484395384034,
      "fos_yielding": 1.7311484141214093,
      "deflection": 0.004690659914142687,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005309)"
      },
      "parent_node_id": "node_1064",
      "improvement_over_parent": null
    },
    "node_1066": {
      "node_id": "node_1066",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.51 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.50837340098207,
      "fos_buckling": 1.5238339136542012,
      "fos_yielding": 2.0144730869554874,
      "deflection": 0.004036876685230692,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.181)"
      },
      "parent_node_id": "node_1065",
      "improvement_over_parent": null
    },
    "node_1067": {
      "node_id": "node_1067",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1066",
      "improvement_over_parent": null
    },
    "node_1068": {
      "node_id": "node_1068",
      "content": "INITIAL DESIGN (Trace 154)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 218.78 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.40e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.7791669582988,
      "fos_buckling": 1.2488808873091788,
      "fos_yielding": 1.6568179637752514,
      "deflection": 0.005401183920711952,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1069": {
      "node_id": "node_1069",
      "content": "MODIFICATION: Increase 8 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 225.90 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.27e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.9038007487281,
      "fos_buckling": 1.2455732474193855,
      "fos_yielding": 1.657774658489425,
      "deflection": 0.005266018227332805,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.389)"
      },
      "parent_node_id": "node_1068",
      "improvement_over_parent": null
    },
    "node_1070": {
      "node_id": "node_1070",
      "content": "MODIFICATION: Increase 0 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 233.63 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.6282748866593,
      "fos_buckling": 1.2487563788169693,
      "fos_yielding": 1.6561869179038482,
      "deflection": 0.005014082624416974,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.416)"
      },
      "parent_node_id": "node_1069",
      "improvement_over_parent": null
    },
    "node_1071": {
      "node_id": "node_1071",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 286.92 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.9229457324718,
      "fos_buckling": 1.479721265653359,
      "fos_yielding": 2.030644083912215,
      "deflection": 0.0040958638276837765,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.250)"
      },
      "parent_node_id": "node_1070",
      "improvement_over_parent": null
    },
    "node_1072": {
      "node_id": "node_1072",
      "content": "MODIFICATION: Increase 9 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.31 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.31094871573856,
      "fos_buckling": 1.5231907775082003,
      "fos_yielding": 2.0128251262867374,
      "deflection": 0.004039632136678368,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.285)"
      },
      "parent_node_id": "node_1071",
      "improvement_over_parent": null
    },
    "node_1073": {
      "node_id": "node_1073",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1072",
      "improvement_over_parent": null
    },
    "node_1074": {
      "node_id": "node_1074",
      "content": "INITIAL DESIGN (Trace 155)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1075": {
      "node_id": "node_1075",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n\nPerformance:\n  Mass: 173.09 kg\n  Factor of Safety: 0.58\n  Max Deflection: 8.63e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.086766143559,
      "fos_buckling": 0.5794327286297327,
      "fos_yielding": 1.8981457068991665,
      "deflection": 0.008630065873385518,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004088)"
      },
      "parent_node_id": "node_1074",
      "improvement_over_parent": null
    },
    "node_1076": {
      "node_id": "node_1076",
      "content": "MODIFICATION: Increase 0 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n\nPerformance:\n  Mass: 178.58 kg\n  Factor of Safety: 0.58\n  Max Deflection: 8.23e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.58360764091728,
      "fos_buckling": 0.5792132449227798,
      "fos_yielding": 1.8981457068991663,
      "deflection": 0.008229314743598384,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.261)"
      },
      "parent_node_id": "node_1075",
      "improvement_over_parent": null
    },
    "node_1077": {
      "node_id": "node_1077",
      "content": "MODIFICATION: Increase 6 thickness by 62%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0057)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n\nPerformance:\n  Mass: 190.67 kg\n  Factor of Safety: 0.58\n  Max Deflection: 8.24e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.67006801654298,
      "fos_buckling": 0.5787312282060283,
      "fos_yielding": 1.8967206912638732,
      "deflection": 0.008237822248363391,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.618)"
      },
      "parent_node_id": "node_1076",
      "improvement_over_parent": null
    },
    "node_1078": {
      "node_id": "node_1078",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0057)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 217.97 kg\n  Factor of Safety: 0.92\n  Max Deflection: 6.22e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.9671605505403,
      "fos_buckling": 0.9195937543309272,
      "fos_yielding": 1.8967206912638739,
      "deflection": 0.006221097941971876,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004391)"
      },
      "parent_node_id": "node_1077",
      "improvement_over_parent": null
    },
    "node_1079": {
      "node_id": "node_1079",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0057)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 238.19 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.20e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.18950187999832,
      "fos_buckling": 0.9799750400551149,
      "fos_yielding": 1.6582756589613323,
      "deflection": 0.005195678514516609,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003967)"
      },
      "parent_node_id": "node_1078",
      "improvement_over_parent": null
    },
    "node_1080": {
      "node_id": "node_1080",
      "content": "MODIFICATION: Increase 9 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0057)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0053)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 243.17 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.12e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.17107503545768,
      "fos_buckling": 1.0075750891797617,
      "fos_yielding": 1.658783011323766,
      "deflection": 0.005123165020769027,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.200)"
      },
      "parent_node_id": "node_1079",
      "improvement_over_parent": null
    },
    "node_1081": {
      "node_id": "node_1081",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0070)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0065)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 292.78 kg\n  Factor of Safety: 1.19\n  Max Deflection: 4.26e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.7777028535166,
      "fos_buckling": 1.1927444326415002,
      "fos_yielding": 1.9965312509358297,
      "deflection": 0.004261340069527318,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.225)"
      },
      "parent_node_id": "node_1080",
      "improvement_over_parent": null
    },
    "node_1082": {
      "node_id": "node_1082",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1081",
      "improvement_over_parent": null
    },
    "node_1083": {
      "node_id": "node_1083",
      "content": "INITIAL DESIGN (Trace 156)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n\nPerformance:\n  Mass: 154.70 kg\n  Factor of Safety: 0.75\n  Max Deflection: 7.66e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 154.70100309921042,
      "fos_buckling": 0.7549154813221077,
      "fos_yielding": 1.1193640267489156,
      "deflection": 0.007663146797297126,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1084": {
      "node_id": "node_1084",
      "content": "MODIFICATION: Increase 4 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n\nPerformance:\n  Mass: 155.28 kg\n  Factor of Safety: 0.75\n  Max Deflection: 7.63e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.27928413021175,
      "fos_buckling": 0.7544787584158519,
      "fos_yielding": 1.119528798542391,
      "deflection": 0.0076255156528861326,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.178)"
      },
      "parent_node_id": "node_1083",
      "improvement_over_parent": null
    },
    "node_1085": {
      "node_id": "node_1085",
      "content": "MODIFICATION: Increase 10 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 162.10 kg\n  Factor of Safety: 0.91\n  Max Deflection: 7.20e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.10120202956185,
      "fos_buckling": 0.9072669359402521,
      "fos_yielding": 1.141281541096054,
      "deflection": 0.007200976624245432,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.389)"
      },
      "parent_node_id": "node_1084",
      "improvement_over_parent": null
    },
    "node_1086": {
      "node_id": "node_1086",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 203.59 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.75e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.5870337735813,
      "fos_buckling": 1.109320022451356,
      "fos_yielding": 1.4316422136523828,
      "deflection": 0.005747882308429085,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_1085",
      "improvement_over_parent": null
    },
    "node_1087": {
      "node_id": "node_1087",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 257.15 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.57e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.1467194084149,
      "fos_buckling": 1.3523233181448522,
      "fos_yielding": 1.8054388807613373,
      "deflection": 0.0045653097800305905,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.285)"
      },
      "parent_node_id": "node_1086",
      "improvement_over_parent": null
    },
    "node_1088": {
      "node_id": "node_1088",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 286.92 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.92446400605036,
      "fos_buckling": 1.4787969985800062,
      "fos_yielding": 2.012728922644951,
      "deflection": 0.00409880909920544,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.127)"
      },
      "parent_node_id": "node_1087",
      "improvement_over_parent": null
    },
    "node_1089": {
      "node_id": "node_1089",
      "content": "MODIFICATION: Increase 8 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.36 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.36191180832526,
      "fos_buckling": 1.5235169248288354,
      "fos_yielding": 2.013496043072601,
      "deflection": 0.004038750437055949,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.267)"
      },
      "parent_node_id": "node_1088",
      "improvement_over_parent": null
    },
    "node_1090": {
      "node_id": "node_1090",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1089",
      "improvement_over_parent": null
    },
    "node_1091": {
      "node_id": "node_1091",
      "content": "INITIAL DESIGN (Trace 157)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 133.82 kg\n  Factor of Safety: 0.59\n  Max Deflection: 9.67e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 133.81562710541724,
      "fos_buckling": 0.5871598651327389,
      "fos_yielding": 1.1398696210642028,
      "deflection": 0.00966726732879705,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1092": {
      "node_id": "node_1092",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0016)]\n\nPerformance:\n  Mass: 142.09 kg\n  Factor of Safety: 0.75\n  Max Deflection: 8.22e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 142.0939656107185,
      "fos_buckling": 0.7526303800773121,
      "fos_yielding": 1.0178245026920583,
      "deflection": 0.008217254026920695,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.001555)"
      },
      "parent_node_id": "node_1091",
      "improvement_over_parent": null
    },
    "node_1093": {
      "node_id": "node_1093",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n\nPerformance:\n  Mass: 173.15 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.76e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.15096519957152,
      "fos_buckling": 0.9052654321573653,
      "fos_yielding": 1.2391174702887535,
      "deflection": 0.0067556950987838725,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.230)"
      },
      "parent_node_id": "node_1092",
      "improvement_over_parent": null
    },
    "node_1094": {
      "node_id": "node_1094",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n\nPerformance:\n  Mass: 218.36 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.37e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.35979809844315,
      "fos_buckling": 1.1198803451058585,
      "fos_yielding": 1.5604661421120816,
      "deflection": 0.0053712316821045,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.279)"
      },
      "parent_node_id": "node_1093",
      "improvement_over_parent": null
    },
    "node_1095": {
      "node_id": "node_1095",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n\nPerformance:\n  Mass: 243.86 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.82e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.85673079186876,
      "fos_buckling": 1.2369649974446222,
      "fos_yielding": 1.741282779816265,
      "deflection": 0.004816817791456067,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.126)"
      },
      "parent_node_id": "node_1094",
      "improvement_over_parent": null
    },
    "node_1096": {
      "node_id": "node_1096",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n\nPerformance:\n  Mass: 285.90 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.8962723378271,
      "fos_buckling": 1.4237917077267481,
      "fos_yielding": 2.038737898838449,
      "deflection": 0.004118640803420844,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.189)"
      },
      "parent_node_id": "node_1095",
      "improvement_over_parent": null
    },
    "node_1097": {
      "node_id": "node_1097",
      "content": "MODIFICATION: Increase 3 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0057)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n\nPerformance:\n  Mass: 288.86 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.86003649206054,
      "fos_buckling": 1.4275795248183574,
      "fos_yielding": 2.0393231046851508,
      "deflection": 0.004076508653643004,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.486)"
      },
      "parent_node_id": "node_1096",
      "improvement_over_parent": null
    },
    "node_1098": {
      "node_id": "node_1098",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1097",
      "improvement_over_parent": null
    },
    "node_1099": {
      "node_id": "node_1099",
      "content": "INITIAL DESIGN (Trace 158)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1100": {
      "node_id": "node_1100",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 188.17 kg\n  Factor of Safety: 0.42\n  Max Deflection: 2.59e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.17293131592731,
      "fos_buckling": 0.422859495549946,
      "fos_yielding": 1.4658190092601047,
      "deflection": 0.0258639911630142,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004709)"
      },
      "parent_node_id": "node_1099",
      "improvement_over_parent": null
    },
    "node_1101": {
      "node_id": "node_1101",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 192.18 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.33e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 192.18044457721706,
      "fos_buckling": 0.4729234976407309,
      "fos_yielding": 1.465388823964606,
      "deflection": 0.00932840647586913,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002485)"
      },
      "parent_node_id": "node_1100",
      "improvement_over_parent": null
    },
    "node_1102": {
      "node_id": "node_1102",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n\nPerformance:\n  Mass: 215.20 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.58e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.19869659849087,
      "fos_buckling": 0.9685032535246368,
      "fos_yielding": 1.5512166133471617,
      "deflection": 0.005583697863960393,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003146)"
      },
      "parent_node_id": "node_1101",
      "improvement_over_parent": null
    },
    "node_1103": {
      "node_id": "node_1103",
      "content": "MODIFICATION: Increase 7 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0058)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n\nPerformance:\n  Mass: 225.35 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.49e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.35332041375068,
      "fos_buckling": 0.9657388310780947,
      "fos_yielding": 1.5330282114964178,
      "deflection": 0.005487383891371791,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.473)"
      },
      "parent_node_id": "node_1102",
      "improvement_over_parent": null
    },
    "node_1104": {
      "node_id": "node_1104",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0077)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n\nPerformance:\n  Mass: 292.82 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.23e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.81790152724966,
      "fos_buckling": 1.223410945605281,
      "fos_yielding": 1.9911738631162512,
      "deflection": 0.004231447149848282,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.330)"
      },
      "parent_node_id": "node_1103",
      "improvement_over_parent": null
    },
    "node_1105": {
      "node_id": "node_1105",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1104",
      "improvement_over_parent": null
    },
    "node_1106": {
      "node_id": "node_1106",
      "content": "INITIAL DESIGN (Trace 159)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 190.55 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.61e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.5547680831211,
      "fos_buckling": 0.8374633441776528,
      "fos_yielding": 1.5605574977965966,
      "deflection": 0.006613376078639173,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1107": {
      "node_id": "node_1107",
      "content": "MODIFICATION: Increase 2 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 196.20 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.62e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.2008015393423,
      "fos_buckling": 0.8371379141901263,
      "fos_yielding": 1.5604563423857725,
      "deflection": 0.006615846715411821,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.403)"
      },
      "parent_node_id": "node_1106",
      "improvement_over_parent": null
    },
    "node_1108": {
      "node_id": "node_1108",
      "content": "MODIFICATION: Increase 9 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 207.93 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.25e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.9338554600526,
      "fos_buckling": 0.8364624445582086,
      "fos_yielding": 1.598383373436583,
      "deflection": 0.0062482460308633785,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.527)"
      },
      "parent_node_id": "node_1107",
      "improvement_over_parent": null
    },
    "node_1109": {
      "node_id": "node_1109",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n\nPerformance:\n  Mass: 234.22 kg\n  Factor of Safety: 1.27\n  Max Deflection: 5.04e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.21923114980797,
      "fos_buckling": 1.2651897438952324,
      "fos_yielding": 1.6095142423977118,
      "deflection": 0.005041319772049071,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004216)"
      },
      "parent_node_id": "node_1108",
      "improvement_over_parent": null
    },
    "node_1110": {
      "node_id": "node_1110",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.31 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.31195487722033,
      "fos_buckling": 1.5236804370489343,
      "fos_yielding": 2.0129095461673323,
      "deflection": 0.00403948419245395,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.277)"
      },
      "parent_node_id": "node_1109",
      "improvement_over_parent": null
    },
    "node_1111": {
      "node_id": "node_1111",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1110",
      "improvement_over_parent": null
    },
    "node_1112": {
      "node_id": "node_1112",
      "content": "INITIAL DESIGN (Trace 160)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 204.14 kg\n  Factor of Safety: 0.45\n  Max Deflection: 9.25e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.14462701124887,
      "fos_buckling": 0.4458493869908206,
      "fos_yielding": 1.0847153799696592,
      "deflection": 0.009245286225338538,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1113": {
      "node_id": "node_1113",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 246.93 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.66e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.92887460990693,
      "fos_buckling": 0.5214378400314786,
      "fos_yielding": 1.3143190776335347,
      "deflection": 0.007659980735590858,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.230)"
      },
      "parent_node_id": "node_1112",
      "improvement_over_parent": null
    },
    "node_1114": {
      "node_id": "node_1114",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 291.51 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.5108057778528,
      "fos_buckling": 1.4172627530024997,
      "fos_yielding": 1.6912667056940363,
      "deflection": 0.004079727562354175,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1113",
      "improvement_over_parent": null
    },
    "node_1115": {
      "node_id": "node_1115",
      "content": "MODIFICATION: Increase 6 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.14159035109367,
      "fos_buckling": 1.5227528385858249,
      "fos_yielding": 2.0111019333486966,
      "deflection": 0.004041825885291483,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.215)"
      },
      "parent_node_id": "node_1114",
      "improvement_over_parent": null
    },
    "node_1116": {
      "node_id": "node_1116",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1115",
      "improvement_over_parent": null
    },
    "node_1117": {
      "node_id": "node_1117",
      "content": "INITIAL DESIGN (Trace 161)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 183.85 kg\n  Factor of Safety: 0.75\n  Max Deflection: 8.29e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.85206211290313,
      "fos_buckling": 0.7536023913344444,
      "fos_yielding": 1.2710278538104325,
      "deflection": 0.00828517253799572,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1118": {
      "node_id": "node_1118",
      "content": "MODIFICATION: Increase 4 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 185.33 kg\n  Factor of Safety: 0.75\n  Max Deflection: 8.29e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.32931240835913,
      "fos_buckling": 0.7536023913344444,
      "fos_yielding": 1.60780587399708,
      "deflection": 0.00828517253799572,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.282)"
      },
      "parent_node_id": "node_1117",
      "improvement_over_parent": null
    },
    "node_1119": {
      "node_id": "node_1119",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n\nPerformance:\n  Mass: 189.02 kg\n  Factor of Safety: 0.75\n  Max Deflection: 7.05e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.01583238950624,
      "fos_buckling": 0.7532198135661058,
      "fos_yielding": 1.416098875735537,
      "deflection": 0.007049688583139406,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002273)"
      },
      "parent_node_id": "node_1118",
      "improvement_over_parent": null
    },
    "node_1120": {
      "node_id": "node_1120",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 218.86 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.10e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.86362769972692,
      "fos_buckling": 0.8538059609111445,
      "fos_yielding": 1.6385265739456036,
      "deflection": 0.006099504969424733,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_1119",
      "improvement_over_parent": null
    },
    "node_1121": {
      "node_id": "node_1121",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 240.07 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.92e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.07251740758076,
      "fos_buckling": 1.2914748536978504,
      "fos_yielding": 1.6501522447442754,
      "deflection": 0.004920158189258204,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004033)"
      },
      "parent_node_id": "node_1120",
      "improvement_over_parent": null
    },
    "node_1122": {
      "node_id": "node_1122",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 292.99 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.98539624890356,
      "fos_buckling": 1.521891312161884,
      "fos_yielding": 2.011438644714843,
      "deflection": 0.0040439736358428915,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.242)"
      },
      "parent_node_id": "node_1121",
      "improvement_over_parent": null
    },
    "node_1123": {
      "node_id": "node_1123",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1122",
      "improvement_over_parent": null
    },
    "node_1124": {
      "node_id": "node_1124",
      "content": "INITIAL DESIGN (Trace 162)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 165.33 kg\n  Factor of Safety: 0.67\n  Max Deflection: 8.41e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.33107142100994,
      "fos_buckling": 0.6655937385330546,
      "fos_yielding": 1.8881380696543197,
      "deflection": 0.0084089957061952,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1125": {
      "node_id": "node_1125",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 200.81 kg\n  Factor of Safety: 0.79\n  Max Deflection: 6.93e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.81012737027493,
      "fos_buckling": 0.7926358163761962,
      "fos_yielding": 2.2880792586670546,
      "deflection": 0.0069349741820480875,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.233)"
      },
      "parent_node_id": "node_1124",
      "improvement_over_parent": null
    },
    "node_1126": {
      "node_id": "node_1126",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 233.72 kg\n  Factor of Safety: 0.79\n  Max Deflection: 5.67e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.72266400189193,
      "fos_buckling": 0.7908444916057086,
      "fos_yielding": 2.2880792586670546,
      "deflection": 0.005672004825561302,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1125",
      "improvement_over_parent": null
    },
    "node_1127": {
      "node_id": "node_1127",
      "content": "MODIFICATION: Increase 3 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 240.58 kg\n  Factor of Safety: 0.79\n  Max Deflection: 5.67e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.57748293952716,
      "fos_buckling": 0.7904724238839468,
      "fos_yielding": 2.2871045724301724,
      "deflection": 0.005674623762947723,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.429)"
      },
      "parent_node_id": "node_1126",
      "improvement_over_parent": null
    },
    "node_1128": {
      "node_id": "node_1128",
      "content": "MODIFICATION: Increase 5 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 241.93 kg\n  Factor of Safety: 0.79\n  Max Deflection: 5.65e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.9310789539,
      "fos_buckling": 0.790325578596519,
      "fos_yielding": 2.2871045724301724,
      "deflection": 0.005653364033593283,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.385)"
      },
      "parent_node_id": "node_1127",
      "improvement_over_parent": null
    },
    "node_1129": {
      "node_id": "node_1129",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 272.91 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.46e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 272.9096250029764,
      "fos_buckling": 1.2177480009865007,
      "fos_yielding": 1.9685525179379075,
      "deflection": 0.004457901968584852,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1128",
      "improvement_over_parent": null
    },
    "node_1130": {
      "node_id": "node_1130",
      "content": "MODIFICATION: Increase 0 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 279.70 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.32e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 279.69515649753725,
      "fos_buckling": 1.2199874424100399,
      "fos_yielding": 1.9672820812300182,
      "deflection": 0.004320540525681744,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.274)"
      },
      "parent_node_id": "node_1129",
      "improvement_over_parent": null
    },
    "node_1131": {
      "node_id": "node_1131",
      "content": "MODIFICATION: Increase 10 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0077)]\n\nPerformance:\n  Mass: 292.44 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.22e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.437049782256,
      "fos_buckling": 1.2784685404264355,
      "fos_yielding": 1.942873052369632,
      "deflection": 0.004220425371802486,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.475)"
      },
      "parent_node_id": "node_1130",
      "improvement_over_parent": null
    },
    "node_1132": {
      "node_id": "node_1132",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1131",
      "improvement_over_parent": null
    },
    "node_1133": {
      "node_id": "node_1133",
      "content": "INITIAL DESIGN (Trace 163)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n\nPerformance:\n  Mass: 144.71 kg\n  Factor of Safety: 0.51\n  Max Deflection: 1.16e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 144.70725243421086,
      "fos_buckling": 0.5071209464158138,
      "fos_yielding": 1.00126149069679,
      "deflection": 11550378607431.424,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1134": {
      "node_id": "node_1134",
      "content": "MODIFICATION: Increase 6 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n\nPerformance:\n  Mass: 147.08 kg\n  Factor of Safety: 0.51\n  Max Deflection: 1.16e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.07975981448493,
      "fos_buckling": 0.5071209464158138,
      "fos_yielding": 1.1253073712763755,
      "deflection": 11550378607431.424,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.577)"
      },
      "parent_node_id": "node_1133",
      "improvement_over_parent": null
    },
    "node_1135": {
      "node_id": "node_1135",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 168.02 kg\n  Factor of Safety: 0.38\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.01620523878861,
      "fos_buckling": 0.3750333047639456,
      "fos_yielding": 1.0646362132360758,
      "deflection": 0.01107908105950549,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003422)"
      },
      "parent_node_id": "node_1134",
      "improvement_over_parent": null
    },
    "node_1136": {
      "node_id": "node_1136",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 198.14 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.95e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.14313237706688,
      "fos_buckling": 1.095113338873794,
      "fos_yielding": 1.3618644355679421,
      "deflection": 0.00594685084826587,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004105)"
      },
      "parent_node_id": "node_1135",
      "improvement_over_parent": null
    },
    "node_1137": {
      "node_id": "node_1137",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 252.04 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.69e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.04373165185126,
      "fos_buckling": 1.3452645431848547,
      "fos_yielding": 1.73024838940255,
      "deflection": 0.004689764756592978,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.294)"
      },
      "parent_node_id": "node_1136",
      "improvement_over_parent": null
    },
    "node_1138": {
      "node_id": "node_1138",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.57 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.56772075738024,
      "fos_buckling": 1.524280103368079,
      "fos_yielding": 2.0134424221457654,
      "deflection": 0.004036120797402174,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.181)"
      },
      "parent_node_id": "node_1137",
      "improvement_over_parent": null
    },
    "node_1139": {
      "node_id": "node_1139",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1138",
      "improvement_over_parent": null
    },
    "node_1140": {
      "node_id": "node_1140",
      "content": "INITIAL DESIGN (Trace 164)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 172.78 kg\n  Factor of Safety: 0.53\n  Max Deflection: 2.49e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.78187335868003,
      "fos_buckling": 0.527199182141019,
      "fos_yielding": 1.247043057570937,
      "deflection": 24894648434256.562,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1141": {
      "node_id": "node_1141",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 197.77 kg\n  Factor of Safety: 0.44\n  Max Deflection: 9.83e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.7705216080598,
      "fos_buckling": 0.43682043219612954,
      "fos_yielding": 1.0032628435674302,
      "deflection": 0.009834488678321726,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004134)"
      },
      "parent_node_id": "node_1140",
      "improvement_over_parent": null
    },
    "node_1142": {
      "node_id": "node_1142",
      "content": "MODIFICATION: Increase 5 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 198.87 kg\n  Factor of Safety: 0.44\n  Max Deflection: 9.53e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.8667021762491,
      "fos_buckling": 0.4367545396955869,
      "fos_yielding": 1.0032157956622454,
      "deflection": 0.009529108625436749,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.379)"
      },
      "parent_node_id": "node_1141",
      "improvement_over_parent": null
    },
    "node_1143": {
      "node_id": "node_1143",
      "content": "MODIFICATION: Increase 6 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 200.56 kg\n  Factor of Safety: 0.44\n  Max Deflection: 9.30e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.5619320459768,
      "fos_buckling": 0.43675453969558703,
      "fos_yielding": 1.2710161105095847,
      "deflection": 0.009298308057367921,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.287)"
      },
      "parent_node_id": "node_1142",
      "improvement_over_parent": null
    },
    "node_1144": {
      "node_id": "node_1144",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 225.65 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.28e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.64988680385883,
      "fos_buckling": 0.4819555938735767,
      "fos_yielding": 1.4288647885222705,
      "deflection": 0.008276228176789085,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.136)"
      },
      "parent_node_id": "node_1143",
      "improvement_over_parent": null
    },
    "node_1145": {
      "node_id": "node_1145",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 248.65 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.6459918125603,
      "fos_buckling": 0.5215754194154345,
      "fos_yielding": 1.5733306104405387,
      "deflection": 0.00752054292757598,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.112)"
      },
      "parent_node_id": "node_1144",
      "improvement_over_parent": null
    },
    "node_1146": {
      "node_id": "node_1146",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2279229805062,
      "fos_buckling": 1.522933970590432,
      "fos_yielding": 2.0133414400594143,
      "deflection": 0.004040693157268889,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1145",
      "improvement_over_parent": null
    },
    "node_1147": {
      "node_id": "node_1147",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1146",
      "improvement_over_parent": null
    },
    "node_1148": {
      "node_id": "node_1148",
      "content": "INITIAL DESIGN (Trace 165)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0022)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0018)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 119.24 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.25e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 119.23504139171341,
      "fos_buckling": 0.5240584869593441,
      "fos_yielding": 1.0682016340120692,
      "deflection": 0.012534749544352283,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1149": {
      "node_id": "node_1149",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 153.26 kg\n  Factor of Safety: 0.66\n  Max Deflection: 9.76e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.26376723359917,
      "fos_buckling": 0.6587684122032106,
      "fos_yielding": 1.3721921558686865,
      "deflection": 0.0097646055088172,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.300)"
      },
      "parent_node_id": "node_1148",
      "improvement_over_parent": null
    },
    "node_1150": {
      "node_id": "node_1150",
      "content": "MODIFICATION: Increase 6 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 158.00 kg\n  Factor of Safety: 0.66\n  Max Deflection: 9.76e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 158.00398527516867,
      "fos_buckling": 0.6589863076226768,
      "fos_yielding": 1.3721921558686865,
      "deflection": 0.009764554877139214,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.333)"
      },
      "parent_node_id": "node_1149",
      "improvement_over_parent": null
    },
    "node_1151": {
      "node_id": "node_1151",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 206.06 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.50e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.06225318489464,
      "fos_buckling": 0.8332782219756002,
      "fos_yielding": 1.788725524734111,
      "deflection": 0.007497815621855558,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.326)"
      },
      "parent_node_id": "node_1150",
      "improvement_over_parent": null
    },
    "node_1152": {
      "node_id": "node_1152",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n\nPerformance:\n  Mass: 225.14 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.51e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.14499020219768,
      "fos_buckling": 0.8439662699658664,
      "fos_yielding": 1.7977966692440692,
      "deflection": 0.007506088637691977,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003727)"
      },
      "parent_node_id": "node_1151",
      "improvement_over_parent": null
    },
    "node_1153": {
      "node_id": "node_1153",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 287.71 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.89e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.7089787553922,
      "fos_buckling": 1.0356768971684902,
      "fos_yielding": 2.293299798089279,
      "deflection": 0.005886025904627472,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.305)"
      },
      "parent_node_id": "node_1152",
      "improvement_over_parent": null
    },
    "node_1154": {
      "node_id": "node_1154",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 292.92 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.9228087892063,
      "fos_buckling": 1.5217589183221312,
      "fos_yielding": 2.0100475135358384,
      "deflection": 0.004044829044149431,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_1153",
      "improvement_over_parent": null
    },
    "node_1155": {
      "node_id": "node_1155",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1154",
      "improvement_over_parent": null
    },
    "node_1156": {
      "node_id": "node_1156",
      "content": "INITIAL DESIGN (Trace 166)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 171.56 kg\n  Factor of Safety: 0.70\n  Max Deflection: 9.30e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.5600636582598,
      "fos_buckling": 0.6982425022203004,
      "fos_yielding": 1.4511963484491406,
      "deflection": 0.009295792294696853,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1157": {
      "node_id": "node_1157",
      "content": "MODIFICATION: Increase 3 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 174.80 kg\n  Factor of Safety: 0.70\n  Max Deflection: 9.30e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.79808256642727,
      "fos_buckling": 0.6984180967024991,
      "fos_yielding": 1.4512108085773912,
      "deflection": 0.00929781033554281,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.282)"
      },
      "parent_node_id": "node_1156",
      "improvement_over_parent": null
    },
    "node_1158": {
      "node_id": "node_1158",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 196.02 kg\n  Factor of Safety: 0.77\n  Max Deflection: 8.30e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.0238816777002,
      "fos_buckling": 0.7724414842195267,
      "fos_yielding": 1.626266622080911,
      "deflection": 0.008298631124325738,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.129)"
      },
      "parent_node_id": "node_1157",
      "improvement_over_parent": null
    },
    "node_1159": {
      "node_id": "node_1159",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n\nPerformance:\n  Mass: 199.71 kg\n  Factor of Safety: 1.08\n  Max Deflection: 5.84e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.70735486135897,
      "fos_buckling": 1.0793125933090213,
      "fos_yielding": 1.447637846142984,
      "deflection": 0.005839186999926225,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002271)"
      },
      "parent_node_id": "node_1158",
      "improvement_over_parent": null
    },
    "node_1160": {
      "node_id": "node_1160",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 245.04 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.77e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.03520410774155,
      "fos_buckling": 1.2850305263368336,
      "fos_yielding": 1.7734919112177985,
      "deflection": 0.004771934850508322,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.245)"
      },
      "parent_node_id": "node_1159",
      "improvement_over_parent": null
    },
    "node_1161": {
      "node_id": "node_1161",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 283.05 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.0520790060469,
      "fos_buckling": 1.4465845051405137,
      "fos_yielding": 2.045952189074738,
      "deflection": 0.004140399752751877,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_1160",
      "improvement_over_parent": null
    },
    "node_1162": {
      "node_id": "node_1162",
      "content": "MODIFICATION: Increase 9 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0097)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 304.05 kg\n  Factor of Safety: 1.54\n  Max Deflection: 3.87e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 304.0540049654232,
      "fos_buckling": 1.5359053764610637,
      "fos_yielding": 2.08321418942775,
      "deflection": 0.00387419985892259,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.548)"
      },
      "parent_node_id": "node_1161",
      "improvement_over_parent": null
    },
    "node_1163": {
      "node_id": "node_1163",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1162",
      "improvement_over_parent": null
    },
    "node_1164": {
      "node_id": "node_1164",
      "content": "INITIAL DESIGN (Trace 167)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0018)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0018)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0015)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0015)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0012)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0010)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0014)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0019)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0017)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0016)]\n\nPerformance:\n  Mass: 81.04 kg\n  Factor of Safety: 0.19\n  Max Deflection: 2.29e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 81.0430823505018,
      "fos_buckling": 0.19277671468402546,
      "fos_yielding": 0.5153049832499887,
      "deflection": 0.02285521386079249,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1165": {
      "node_id": "node_1165",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0022)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0024)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0021)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n\nPerformance:\n  Mass: 102.74 kg\n  Factor of Safety: 0.24\n  Max Deflection: 1.81e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 102.74033267368718,
      "fos_buckling": 0.2406141299124617,
      "fos_yielding": 0.6528154802425663,
      "deflection": 0.01805078390650392,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.277)"
      },
      "parent_node_id": "node_1164",
      "improvement_over_parent": null
    },
    "node_1166": {
      "node_id": "node_1166",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0022)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0024)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0021)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0025)]\n\nPerformance:\n  Mass: 121.16 kg\n  Factor of Safety: 0.70\n  Max Deflection: 9.68e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 121.16156093212652,
      "fos_buckling": 0.7026904850535661,
      "fos_yielding": 0.8347796364918969,
      "deflection": 0.009681532870416825,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.002453)"
      },
      "parent_node_id": "node_1165",
      "improvement_over_parent": null
    },
    "node_1167": {
      "node_id": "node_1167",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 157.75 kg\n  Factor of Safety: 0.89\n  Max Deflection: 7.45e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.7491338926352,
      "fos_buckling": 0.8943991059924276,
      "fos_yielding": 1.085962555148032,
      "deflection": 0.0074519590504353896,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.316)"
      },
      "parent_node_id": "node_1166",
      "improvement_over_parent": null
    },
    "node_1168": {
      "node_id": "node_1168",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 192.47 kg\n  Factor of Safety: 1.07\n  Max Deflection: 6.12e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 192.4713704935396,
      "fos_buckling": 1.0676419482338222,
      "fos_yielding": 1.3239557517831113,
      "deflection": 0.006119988365092829,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.233)"
      },
      "parent_node_id": "node_1167",
      "improvement_over_parent": null
    },
    "node_1169": {
      "node_id": "node_1169",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 230.33 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.13e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.33343116717217,
      "fos_buckling": 1.2469630633917144,
      "fos_yielding": 1.5830450912105354,
      "deflection": 0.005125267502212589,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.211)"
      },
      "parent_node_id": "node_1168",
      "improvement_over_parent": null
    },
    "node_1170": {
      "node_id": "node_1170",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.28 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2793684898206,
      "fos_buckling": 1.5231181327335415,
      "fos_yielding": 2.0128049633217344,
      "deflection": 0.004039968738479168,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.300)"
      },
      "parent_node_id": "node_1169",
      "improvement_over_parent": null
    },
    "node_1171": {
      "node_id": "node_1171",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1170",
      "improvement_over_parent": null
    },
    "node_1172": {
      "node_id": "node_1172",
      "content": "INITIAL DESIGN (Trace 168)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 199.36 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.38e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.35721062246486,
      "fos_buckling": 0.9021409624447188,
      "fos_yielding": 1.8536778876268385,
      "deflection": 0.006376127010128678,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1173": {
      "node_id": "node_1173",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 246.41 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.17e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.40557834412135,
      "fos_buckling": 1.0738462646576301,
      "fos_yielding": 2.2883102670083972,
      "deflection": 0.0051722498076383384,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.258)"
      },
      "parent_node_id": "node_1172",
      "improvement_over_parent": null
    },
    "node_1174": {
      "node_id": "node_1174",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 277.38 kg\n  Factor of Safety: 1.16\n  Max Deflection: 4.38e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 277.38412439319774,
      "fos_buckling": 1.1568503893717916,
      "fos_yielding": 2.016080204689095,
      "deflection": 0.004382016764898935,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1173",
      "improvement_over_parent": null
    },
    "node_1175": {
      "node_id": "node_1175",
      "content": "MODIFICATION: Increase 7 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.266128020485,
      "fos_buckling": 1.5229875443364498,
      "fos_yielding": 2.0126592064513833,
      "deflection": 0.004040094734729077,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.637)"
      },
      "parent_node_id": "node_1174",
      "improvement_over_parent": null
    },
    "node_1176": {
      "node_id": "node_1176",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1175",
      "improvement_over_parent": null
    },
    "node_1177": {
      "node_id": "node_1177",
      "content": "INITIAL DESIGN (Trace 169)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 135.22 kg\n  Factor of Safety: 0.29\n  Max Deflection: 6.14e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 135.220576976588,
      "fos_buckling": 0.29499186664948385,
      "fos_yielding": 0.4858796580207949,
      "deflection": 61445602110572.57,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1178": {
      "node_id": "node_1178",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 160.61 kg\n  Factor of Safety: 0.08\n  Max Deflection: 1.04e+14 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.6075664896614,
      "fos_buckling": 0.08221433526857308,
      "fos_yielding": 0.2780527985496872,
      "deflection": 104081717981325.14,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004205)"
      },
      "parent_node_id": "node_1177",
      "improvement_over_parent": null
    },
    "node_1179": {
      "node_id": "node_1179",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 196.01 kg\n  Factor of Safety: 0.86\n  Max Deflection: 7.02e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.00884957474747,
      "fos_buckling": 0.8558114585888883,
      "fos_yielding": 1.615078767966652,
      "deflection": 0.007019074984701737,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004966)"
      },
      "parent_node_id": "node_1178",
      "improvement_over_parent": null
    },
    "node_1180": {
      "node_id": "node_1180",
      "content": "MODIFICATION: Increase 4 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 197.74 kg\n  Factor of Safety: 0.86\n  Max Deflection: 7.02e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.73955475743415,
      "fos_buckling": 0.8558114585888883,
      "fos_yielding": 1.615078767966652,
      "deflection": 0.007019074984701737,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.460)"
      },
      "parent_node_id": "node_1179",
      "improvement_over_parent": null
    },
    "node_1181": {
      "node_id": "node_1181",
      "content": "MODIFICATION: Increase 0 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 205.92 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.32e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.91844667594555,
      "fos_buckling": 0.8553300232999433,
      "fos_yielding": 1.6148972386865548,
      "deflection": 0.006318878742815457,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.447)"
      },
      "parent_node_id": "node_1180",
      "improvement_over_parent": null
    },
    "node_1182": {
      "node_id": "node_1182",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 232.89 kg\n  Factor of Safety: 1.29\n  Max Deflection: 5.16e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.88670313482845,
      "fos_buckling": 1.2915450347868076,
      "fos_yielding": 1.6251724289332667,
      "deflection": 0.005157794267375272,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004334)"
      },
      "parent_node_id": "node_1181",
      "improvement_over_parent": null
    },
    "node_1183": {
      "node_id": "node_1183",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 284.34 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.24e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 284.34204797542253,
      "fos_buckling": 1.521880577995255,
      "fos_yielding": 1.9815246578596692,
      "deflection": 0.004235331730935956,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.242)"
      },
      "parent_node_id": "node_1182",
      "improvement_over_parent": null
    },
    "node_1184": {
      "node_id": "node_1184",
      "content": "MODIFICATION: Increase 1 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.29702394616214,
      "fos_buckling": 1.5228777387521641,
      "fos_yielding": 2.012737914961303,
      "deflection": 0.004039561540537476,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.376)"
      },
      "parent_node_id": "node_1183",
      "improvement_over_parent": null
    },
    "node_1185": {
      "node_id": "node_1185",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1184",
      "improvement_over_parent": null
    },
    "node_1186": {
      "node_id": "node_1186",
      "content": "INITIAL DESIGN (Trace 170)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n\nPerformance:\n  Mass: 103.70 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.67e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 103.70318158011179,
      "fos_buckling": 0.43387689350166997,
      "fos_yielding": 1.9361878232196328,
      "deflection": 16660218782852.914,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1187": {
      "node_id": "node_1187",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 121.45 kg\n  Factor of Safety: 0.25\n  Max Deflection: 1.46e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 121.44642714502858,
      "fos_buckling": 0.25234499333158816,
      "fos_yielding": 0.5626536856381877,
      "deflection": 14648889811967.418,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.182)"
      },
      "parent_node_id": "node_1186",
      "improvement_over_parent": null
    },
    "node_1188": {
      "node_id": "node_1188",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n\nPerformance:\n  Mass: 151.85 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.17e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.85476385469732,
      "fos_buckling": 0.38921958258889827,
      "fos_yielding": 1.1100609949555473,
      "deflection": 0.011733953597050146,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004220)"
      },
      "parent_node_id": "node_1187",
      "improvement_over_parent": null
    },
    "node_1189": {
      "node_id": "node_1189",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 179.05 kg\n  Factor of Safety: 0.45\n  Max Deflection: 9.97e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.04846660300836,
      "fos_buckling": 0.4482221568637421,
      "fos_yielding": 1.3076667099994879,
      "deflection": 0.009967837507723907,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.193)"
      },
      "parent_node_id": "node_1188",
      "improvement_over_parent": null
    },
    "node_1190": {
      "node_id": "node_1190",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 206.36 kg\n  Factor of Safety: 0.45\n  Max Deflection: 9.04e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.3570850597439,
      "fos_buckling": 0.44738027935770225,
      "fos_yielding": 1.306903051454967,
      "deflection": 0.009039922359671397,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004393)"
      },
      "parent_node_id": "node_1189",
      "improvement_over_parent": null
    },
    "node_1191": {
      "node_id": "node_1191",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 243.35 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.34959263864155,
      "fos_buckling": 1.3061837905725224,
      "fos_yielding": 1.6720382171509416,
      "deflection": 0.004854778075305732,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005113)"
      },
      "parent_node_id": "node_1190",
      "improvement_over_parent": null
    },
    "node_1192": {
      "node_id": "node_1192",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.21 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.20774814829736,
      "fos_buckling": 1.5226827063577315,
      "fos_yielding": 2.0123471147485583,
      "deflection": 0.004040921184037478,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.225)"
      },
      "parent_node_id": "node_1191",
      "improvement_over_parent": null
    },
    "node_1193": {
      "node_id": "node_1193",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1192",
      "improvement_over_parent": null
    },
    "node_1194": {
      "node_id": "node_1194",
      "content": "INITIAL DESIGN (Trace 171)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 173.52 kg\n  Factor of Safety: 0.42\n  Max Deflection: 1.06e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.51699678636254,
      "fos_buckling": 0.4246062806636946,
      "fos_yielding": 1.2277134200908875,
      "deflection": 0.010614853193843412,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1195": {
      "node_id": "node_1195",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 208.24 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.41e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.24429375322282,
      "fos_buckling": 0.8185945996735434,
      "fos_yielding": 1.558891804000751,
      "deflection": 0.006406361665023463,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004777)"
      },
      "parent_node_id": "node_1194",
      "improvement_over_parent": null
    },
    "node_1196": {
      "node_id": "node_1196",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 237.42 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.63e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.4231044326227,
      "fos_buckling": 0.9138759413386495,
      "fos_yielding": 1.7760668304764038,
      "deflection": 0.005629149711005569,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.152)"
      },
      "parent_node_id": "node_1195",
      "improvement_over_parent": null
    },
    "node_1197": {
      "node_id": "node_1197",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 267.24 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.242485032408,
      "fos_buckling": 1.0064039619222824,
      "fos_yielding": 1.9976931481019868,
      "deflection": 0.005010224587061168,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_1196",
      "improvement_over_parent": null
    },
    "node_1198": {
      "node_id": "node_1198",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1399221747978,
      "fos_buckling": 1.5224753855924993,
      "fos_yielding": 2.0118138092947313,
      "deflection": 0.00404189573123531,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1197",
      "improvement_over_parent": null
    },
    "node_1199": {
      "node_id": "node_1199",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1198",
      "improvement_over_parent": null
    },
    "node_1200": {
      "node_id": "node_1200",
      "content": "INITIAL DESIGN (Trace 172)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n\nPerformance:\n  Mass: 171.97 kg\n  Factor of Safety: 0.25\n  Max Deflection: 2.17e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.97408605034474,
      "fos_buckling": 0.2484094735444763,
      "fos_yielding": 0.5626536856381877,
      "deflection": 21714046288536.453,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1201": {
      "node_id": "node_1201",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 207.41 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.13e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.41176600354999,
      "fos_buckling": 0.8872653302188367,
      "fos_yielding": 1.8197698695654976,
      "deflection": 0.006125457791944393,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004882)"
      },
      "parent_node_id": "node_1200",
      "improvement_over_parent": null
    },
    "node_1202": {
      "node_id": "node_1202",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 232.04 kg\n  Factor of Safety: 1.17\n  Max Deflection: 5.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.04045386998402,
      "fos_buckling": 1.1671165814100568,
      "fos_yielding": 1.601623882254787,
      "deflection": 0.005105946345024927,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004070)"
      },
      "parent_node_id": "node_1201",
      "improvement_over_parent": null
    },
    "node_1203": {
      "node_id": "node_1203",
      "content": "MODIFICATION: Increase 4 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 233.11 kg\n  Factor of Safety: 1.26\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.10561953210998,
      "fos_buckling": 1.2596275194130753,
      "fos_yielding": 1.602014608436571,
      "deflection": 0.005065143290461968,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.252)"
      },
      "parent_node_id": "node_1202",
      "improvement_over_parent": null
    },
    "node_1204": {
      "node_id": "node_1204",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.40 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.40366610457176,
      "fos_buckling": 1.5235551931795488,
      "fos_yielding": 2.0136728639618773,
      "deflection": 0.004038295438329083,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.284)"
      },
      "parent_node_id": "node_1203",
      "improvement_over_parent": null
    },
    "node_1205": {
      "node_id": "node_1205",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1204",
      "improvement_over_parent": null
    },
    "node_1206": {
      "node_id": "node_1206",
      "content": "INITIAL DESIGN (Trace 173)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 182.28 kg\n  Factor of Safety: 0.29\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.27696924772965,
      "fos_buckling": 0.28915246021844954,
      "fos_yielding": 1.194272174632835,
      "deflection": 0.011149684940300154,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1207": {
      "node_id": "node_1207",
      "content": "MODIFICATION: Increase 3 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 188.39 kg\n  Factor of Safety: 0.41\n  Max Deflection: 9.89e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.39469058592348,
      "fos_buckling": 0.41414426900193974,
      "fos_yielding": 1.1938031849738227,
      "deflection": 0.009891568582081517,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.529)"
      },
      "parent_node_id": "node_1206",
      "improvement_over_parent": null
    },
    "node_1208": {
      "node_id": "node_1208",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 223.96 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.34e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.956243789839,
      "fos_buckling": 0.4790323620202589,
      "fos_yielding": 1.417552677012613,
      "deflection": 0.008337643583664029,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.205)"
      },
      "parent_node_id": "node_1207",
      "improvement_over_parent": null
    },
    "node_1209": {
      "node_id": "node_1209",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 248.82 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.81731266014322,
      "fos_buckling": 0.521930418341269,
      "fos_yielding": 1.573677611810455,
      "deflection": 0.007515103390756193,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.122)"
      },
      "parent_node_id": "node_1208",
      "improvement_over_parent": null
    },
    "node_1210": {
      "node_id": "node_1210",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.40 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3992438280891,
      "fos_buckling": 1.5231254354280876,
      "fos_yielding": 2.0137112637464494,
      "deflection": 0.0040384314077400296,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1209",
      "improvement_over_parent": null
    },
    "node_1211": {
      "node_id": "node_1211",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1210",
      "improvement_over_parent": null
    },
    "node_1212": {
      "node_id": "node_1212",
      "content": "INITIAL DESIGN (Trace 174)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0023)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 151.80 kg\n  Factor of Safety: 0.57\n  Max Deflection: 1.24e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.79669661646503,
      "fos_buckling": 0.5701526996529077,
      "fos_yielding": 1.3247926598799047,
      "deflection": 0.012405687165723236,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1213": {
      "node_id": "node_1213",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 173.25 kg\n  Factor of Safety: 0.64\n  Max Deflection: 1.09e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.25102746991766,
      "fos_buckling": 0.6433561594126408,
      "fos_yielding": 1.5102842037602433,
      "deflection": 0.010868135791494838,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.149)"
      },
      "parent_node_id": "node_1212",
      "improvement_over_parent": null
    },
    "node_1214": {
      "node_id": "node_1214",
      "content": "MODIFICATION: Increase 0 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 179.23 kg\n  Factor of Safety: 0.67\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.23252367912255,
      "fos_buckling": 0.6651717698287682,
      "fos_yielding": 1.4882721178181564,
      "deflection": 0.010076795389119535,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.383)"
      },
      "parent_node_id": "node_1213",
      "improvement_over_parent": null
    },
    "node_1215": {
      "node_id": "node_1215",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 217.58 kg\n  Factor of Safety: 0.79\n  Max Deflection: 8.30e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.58100015745117,
      "fos_buckling": 0.7913818845872861,
      "fos_yielding": 1.8039956919196305,
      "deflection": 0.008303571373740201,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.229)"
      },
      "parent_node_id": "node_1214",
      "improvement_over_parent": null
    },
    "node_1216": {
      "node_id": "node_1216",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 221.77 kg\n  Factor of Safety: 1.19\n  Max Deflection: 5.43e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.7729633489659,
      "fos_buckling": 1.1887741776993266,
      "fos_yielding": 1.5769349953996283,
      "deflection": 0.005431380842750653,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002608)"
      },
      "parent_node_id": "node_1215",
      "improvement_over_parent": null
    },
    "node_1217": {
      "node_id": "node_1217",
      "content": "MODIFICATION: Increase 1 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 229.57 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.18e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.56508969183366,
      "fos_buckling": 1.1234204913866848,
      "fos_yielding": 1.6019859042558462,
      "deflection": 0.00518323249498139,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.410)"
      },
      "parent_node_id": "node_1216",
      "improvement_over_parent": null
    },
    "node_1218": {
      "node_id": "node_1218",
      "content": "MODIFICATION: Increase 10 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0032)]\n\nPerformance:\n  Mass: 230.42 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.42322542640298,
      "fos_buckling": 1.1325303327440186,
      "fos_yielding": 1.5984934093251641,
      "deflection": 0.005140012879252308,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.224)"
      },
      "parent_node_id": "node_1217",
      "improvement_over_parent": null
    },
    "node_1219": {
      "node_id": "node_1219",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0040)]\n\nPerformance:\n  Mass: 286.57 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.5686595485816,
      "fos_buckling": 1.3677093765950277,
      "fos_yielding": 1.9852190521029796,
      "deflection": 0.004146106101473165,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.267)"
      },
      "parent_node_id": "node_1218",
      "improvement_over_parent": null
    },
    "node_1220": {
      "node_id": "node_1220",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1219",
      "improvement_over_parent": null
    },
    "node_1221": {
      "node_id": "node_1221",
      "content": "INITIAL DESIGN (Trace 175)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1222": {
      "node_id": "node_1222",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 268.84 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.8410510953092,
      "fos_buckling": 1.0721042093965394,
      "fos_yielding": 2.287134244823017,
      "deflection": 0.004852848294273609,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1221",
      "improvement_over_parent": null
    },
    "node_1223": {
      "node_id": "node_1223",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2225230561413,
      "fos_buckling": 1.5228696895163494,
      "fos_yielding": 2.012447164286147,
      "deflection": 0.004040726728707249,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1222",
      "improvement_over_parent": null
    },
    "node_1224": {
      "node_id": "node_1224",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1223",
      "improvement_over_parent": null
    },
    "node_1225": {
      "node_id": "node_1225",
      "content": "INITIAL DESIGN (Trace 176)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 224.87 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.86764524020685,
      "fos_buckling": 1.1406965365395483,
      "fos_yielding": 1.6243451325109741,
      "deflection": 0.005232755566101483,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1226": {
      "node_id": "node_1226",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 275.92 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.28e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 275.92167853592946,
      "fos_buckling": 1.3610429735127194,
      "fos_yielding": 1.9892686700071205,
      "deflection": 0.004276833038085271,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.248)"
      },
      "parent_node_id": "node_1225",
      "improvement_over_parent": null
    },
    "node_1227": {
      "node_id": "node_1227",
      "content": "MODIFICATION: Increase 8 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 285.65 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.18e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.64682649479516,
      "fos_buckling": 1.3566737278200824,
      "fos_yielding": 1.9904477341118885,
      "deflection": 0.004178566430729464,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.460)"
      },
      "parent_node_id": "node_1226",
      "improvement_over_parent": null
    },
    "node_1228": {
      "node_id": "node_1228",
      "content": "MODIFICATION: Increase 10 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.29 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.28698512946323,
      "fos_buckling": 1.5234268640344641,
      "fos_yielding": 2.012771312086077,
      "deflection": 0.004039845464870883,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.227)"
      },
      "parent_node_id": "node_1227",
      "improvement_over_parent": null
    },
    "node_1229": {
      "node_id": "node_1229",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1228",
      "improvement_over_parent": null
    },
    "node_1230": {
      "node_id": "node_1230",
      "content": "INITIAL DESIGN (Trace 177)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n\nPerformance:\n  Mass: 127.22 kg\n  Factor of Safety: 0.52\n  Max Deflection: 9.88e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 127.22432088582615,
      "fos_buckling": 0.5164896559675926,
      "fos_yielding": 1.0731346552322265,
      "deflection": 9881738858131.148,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1231": {
      "node_id": "node_1231",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 152.52 kg\n  Factor of Safety: 0.66\n  Max Deflection: 8.49e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.5164927077645,
      "fos_buckling": 0.6607305731959496,
      "fos_yielding": 1.2989221821912782,
      "deflection": 0.008491826552841806,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003413)"
      },
      "parent_node_id": "node_1230",
      "improvement_over_parent": null
    },
    "node_1232": {
      "node_id": "node_1232",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 196.15 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.62e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.14712945485792,
      "fos_buckling": 0.8243026450323355,
      "fos_yielding": 1.6698172297343237,
      "deflection": 0.006621077529434345,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.305)"
      },
      "parent_node_id": "node_1231",
      "improvement_over_parent": null
    },
    "node_1233": {
      "node_id": "node_1233",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 238.30 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.46e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.3007829284643,
      "fos_buckling": 0.9717544331627355,
      "fos_yielding": 2.0278660049280663,
      "deflection": 0.0054642982258143865,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.233)"
      },
      "parent_node_id": "node_1232",
      "improvement_over_parent": null
    },
    "node_1234": {
      "node_id": "node_1234",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 259.92 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.55e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.9231075897747,
      "fos_buckling": 1.3802308249627522,
      "fos_yielding": 1.7851162627570198,
      "deflection": 0.004549683765977017,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004265)"
      },
      "parent_node_id": "node_1233",
      "improvement_over_parent": null
    },
    "node_1235": {
      "node_id": "node_1235",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.04 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0431675043066,
      "fos_buckling": 1.522186271918956,
      "fos_yielding": 2.011080298805017,
      "deflection": 0.0040432278071749015,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.140)"
      },
      "parent_node_id": "node_1234",
      "improvement_over_parent": null
    },
    "node_1236": {
      "node_id": "node_1236",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1235",
      "improvement_over_parent": null
    },
    "node_1237": {
      "node_id": "node_1237",
      "content": "INITIAL DESIGN (Trace 178)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 174.48 kg\n  Factor of Safety: 0.73\n  Max Deflection: 7.60e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.48117409362254,
      "fos_buckling": 0.7282133505308082,
      "fos_yielding": 1.344042780998892,
      "deflection": 0.007601502411943318,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1238": {
      "node_id": "node_1238",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 219.19 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.07e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.1929425743745,
      "fos_buckling": 0.8846285739453411,
      "fos_yielding": 1.685923396538633,
      "deflection": 0.006067121323570187,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.276)"
      },
      "parent_node_id": "node_1237",
      "improvement_over_parent": null
    },
    "node_1239": {
      "node_id": "node_1239",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n\nPerformance:\n  Mass: 241.29 kg\n  Factor of Safety: 1.13\n  Max Deflection: 4.99e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.29189286137967,
      "fos_buckling": 1.1340366157844597,
      "fos_yielding": 1.6991315076795042,
      "deflection": 0.004987304445611123,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004216)"
      },
      "parent_node_id": "node_1238",
      "improvement_over_parent": null
    },
    "node_1240": {
      "node_id": "node_1240",
      "content": "MODIFICATION: Increase 5 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0048)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n\nPerformance:\n  Mass: 243.18 kg\n  Factor of Safety: 1.16\n  Max Deflection: 4.94e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.18025022110888,
      "fos_buckling": 1.1550441886863403,
      "fos_yielding": 2.0661628827748126,
      "deflection": 0.004942237828597599,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.245)"
      },
      "parent_node_id": "node_1239",
      "improvement_over_parent": null
    },
    "node_1241": {
      "node_id": "node_1241",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0057)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 285.11 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.22e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.10857263072324,
      "fos_buckling": 1.3266965032670817,
      "fos_yielding": 2.410493009929707,
      "deflection": 0.004223884720917577,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.189)"
      },
      "parent_node_id": "node_1240",
      "improvement_over_parent": null
    },
    "node_1242": {
      "node_id": "node_1242",
      "content": "MODIFICATION: Increase 10 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0057)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0065)]\n\nPerformance:\n  Mass: 291.83 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.18e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.8276298521739,
      "fos_buckling": 1.324033200048431,
      "fos_yielding": 2.4113183418868047,
      "deflection": 0.004178247277802716,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.294)"
      },
      "parent_node_id": "node_1241",
      "improvement_over_parent": null
    },
    "node_1243": {
      "node_id": "node_1243",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1242",
      "improvement_over_parent": null
    },
    "node_1244": {
      "node_id": "node_1244",
      "content": "INITIAL DESIGN (Trace 179)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n\nPerformance:\n  Mass: 149.38 kg\n  Factor of Safety: 0.14\n  Max Deflection: 8.37e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.3782230347047,
      "fos_buckling": 0.13775479864930146,
      "fos_yielding": 0.6080323364908599,
      "deflection": 83748068559028.22,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1245": {
      "node_id": "node_1245",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 170.64 kg\n  Factor of Safety: 0.38\n  Max Deflection: 1.09e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.63717454973053,
      "fos_buckling": 0.38013257104308656,
      "fos_yielding": 1.0819184444940761,
      "deflection": 0.010910468193626737,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003478)"
      },
      "parent_node_id": "node_1244",
      "improvement_over_parent": null
    },
    "node_1246": {
      "node_id": "node_1246",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 213.58 kg\n  Factor of Safety: 0.46\n  Max Deflection: 8.74e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.58110549913243,
      "fos_buckling": 0.46047572086295835,
      "fos_yielding": 1.3523647213084136,
      "deflection": 0.008737928531368044,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_1245",
      "improvement_over_parent": null
    },
    "node_1247": {
      "node_id": "node_1247",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 251.89 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.69e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.89088480240474,
      "fos_buckling": 1.3448771520254075,
      "fos_yielding": 1.7303265203521827,
      "deflection": 0.004692443535938442,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005310)"
      },
      "parent_node_id": "node_1246",
      "improvement_over_parent": null
    },
    "node_1248": {
      "node_id": "node_1248",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.94 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.94085147674747,
      "fos_buckling": 1.5219801745735375,
      "fos_yielding": 2.010453375759205,
      "deflection": 0.004044504758984236,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.179)"
      },
      "parent_node_id": "node_1247",
      "improvement_over_parent": null
    },
    "node_1249": {
      "node_id": "node_1249",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1248",
      "improvement_over_parent": null
    },
    "node_1250": {
      "node_id": "node_1250",
      "content": "INITIAL DESIGN (Trace 180)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 181.02 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.63e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.0244603023512,
      "fos_buckling": 0.8760269609849821,
      "fos_yielding": 1.3231957546807371,
      "deflection": 0.006632242604736492,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1251": {
      "node_id": "node_1251",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 219.96 kg\n  Factor of Safety: 1.05\n  Max Deflection: 5.47e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.958365258127,
      "fos_buckling": 1.0529185437714892,
      "fos_yielding": 1.6052941690439437,
      "deflection": 0.005468498040108342,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.230)"
      },
      "parent_node_id": "node_1250",
      "improvement_over_parent": null
    },
    "node_1252": {
      "node_id": "node_1252",
      "content": "MODIFICATION: Increase 3 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 223.88 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.41e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.87763244025052,
      "fos_buckling": 1.0265069409953163,
      "fos_yielding": 1.5942264674210518,
      "deflection": 0.005413935343882987,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.276)"
      },
      "parent_node_id": "node_1251",
      "improvement_over_parent": null
    },
    "node_1253": {
      "node_id": "node_1253",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 285.21 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.26e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.2087627631417,
      "fos_buckling": 1.2860915209247639,
      "fos_yielding": 2.026725470600395,
      "deflection": 0.0042614147605948265,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.300)"
      },
      "parent_node_id": "node_1252",
      "improvement_over_parent": null
    },
    "node_1254": {
      "node_id": "node_1254",
      "content": "MODIFICATION: Increase 5 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 286.97 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.16e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 286.9687384575683,
      "fos_buckling": 1.5204271060510388,
      "fos_yielding": 2.013730390028975,
      "deflection": 0.0041643683844319835,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.558)"
      },
      "parent_node_id": "node_1253",
      "improvement_over_parent": null
    },
    "node_1255": {
      "node_id": "node_1255",
      "content": "MODIFICATION: Increase 0 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.229244913957,
      "fos_buckling": 1.5229430543019749,
      "fos_yielding": 2.012449893324718,
      "deflection": 0.004040538416957099,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.248)"
      },
      "parent_node_id": "node_1254",
      "improvement_over_parent": null
    },
    "node_1256": {
      "node_id": "node_1256",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1255",
      "improvement_over_parent": null
    },
    "node_1257": {
      "node_id": "node_1257",
      "content": "INITIAL DESIGN (Trace 181)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 170.10 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.94e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.09577749159794,
      "fos_buckling": 0.8765456104457977,
      "fos_yielding": 1.1758849458482046,
      "deflection": 0.0069416006422147155,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1258": {
      "node_id": "node_1258",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 206.87 kg\n  Factor of Safety: 1.05\n  Max Deflection: 5.72e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.87002008567197,
      "fos_buckling": 1.0486205743423234,
      "fos_yielding": 1.4288527884217006,
      "deflection": 0.005719587792318685,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.230)"
      },
      "parent_node_id": "node_1257",
      "improvement_over_parent": null
    },
    "node_1259": {
      "node_id": "node_1259",
      "content": "MODIFICATION: Increase 4 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 207.84 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.67e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.84497633649482,
      "fos_buckling": 1.141646521909056,
      "fos_yielding": 1.4292125232418516,
      "deflection": 0.005672388141560341,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.258)"
      },
      "parent_node_id": "node_1258",
      "improvement_over_parent": null
    },
    "node_1260": {
      "node_id": "node_1260",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 238.94 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.94e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.94016804481288,
      "fos_buckling": 1.2863271884924754,
      "fos_yielding": 1.641881475424901,
      "deflection": 0.004943124363429683,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.161)"
      },
      "parent_node_id": "node_1259",
      "improvement_over_parent": null
    },
    "node_1261": {
      "node_id": "node_1261",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.34 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.33927595578933,
      "fos_buckling": 1.5233591651619882,
      "fos_yielding": 2.013216190208058,
      "deflection": 0.004039157530466538,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.250)"
      },
      "parent_node_id": "node_1260",
      "improvement_over_parent": null
    },
    "node_1262": {
      "node_id": "node_1262",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1261",
      "improvement_over_parent": null
    },
    "node_1263": {
      "node_id": "node_1263",
      "content": "INITIAL DESIGN (Trace 182)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0014)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 152.76 kg\n  Factor of Safety: 0.59\n  Max Deflection: 8.54e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.7605523208594,
      "fos_buckling": 0.5889333159221406,
      "fos_yielding": 1.1475453038682657,
      "deflection": 0.008540504519302263,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1264": {
      "node_id": "node_1264",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 193.10 kg\n  Factor of Safety: 0.73\n  Max Deflection: 6.77e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.10348675511386,
      "fos_buckling": 0.7277571751223638,
      "fos_yielding": 1.4546141500041716,
      "deflection": 0.006769449725422355,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.282)"
      },
      "parent_node_id": "node_1263",
      "improvement_over_parent": null
    },
    "node_1265": {
      "node_id": "node_1265",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 248.09 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.28e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.08823546983814,
      "fos_buckling": 0.9057743961915509,
      "fos_yielding": 1.876693786344054,
      "deflection": 0.0052828370478386465,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.311)"
      },
      "parent_node_id": "node_1264",
      "improvement_over_parent": null
    },
    "node_1266": {
      "node_id": "node_1266",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 271.49 kg\n  Factor of Safety: 1.17\n  Max Deflection: 4.38e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 271.4901359294859,
      "fos_buckling": 1.1652352794710854,
      "fos_yielding": 1.8997704668060515,
      "deflection": 0.0043837703030929,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003853)"
      },
      "parent_node_id": "node_1265",
      "improvement_over_parent": null
    },
    "node_1267": {
      "node_id": "node_1267",
      "content": "MODIFICATION: Increase 3 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 274.85 kg\n  Factor of Safety: 1.17\n  Max Deflection: 4.35e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 274.8548659272558,
      "fos_buckling": 1.1656866230317628,
      "fos_yielding": 1.900506326063031,
      "deflection": 0.004352665828816398,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.176)"
      },
      "parent_node_id": "node_1266",
      "improvement_over_parent": null
    },
    "node_1268": {
      "node_id": "node_1268",
      "content": "MODIFICATION: Increase 4 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 277.43 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.27e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 277.430171958924,
      "fos_buckling": 1.2924347148721926,
      "fos_yielding": 2.010530130514676,
      "deflection": 0.004273998729107397,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.631)"
      },
      "parent_node_id": "node_1267",
      "improvement_over_parent": null
    },
    "node_1269": {
      "node_id": "node_1269",
      "content": "MODIFICATION: Increase 9 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0068)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 289.10 kg\n  Factor of Safety: 1.53\n  Max Deflection: 4.05e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 289.1020100088613,
      "fos_buckling": 1.5306151050829369,
      "fos_yielding": 2.0421169673921686,
      "deflection": 0.004054270629757529,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.355)"
      },
      "parent_node_id": "node_1268",
      "improvement_over_parent": null
    },
    "node_1270": {
      "node_id": "node_1270",
      "content": "MODIFICATION: Increase 10 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0068)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0048)]\n\nPerformance:\n  Mass: 294.37 kg\n  Factor of Safety: 1.53\n  Max Deflection: 4.01e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 294.3678667916856,
      "fos_buckling": 1.5278611424609547,
      "fos_yielding": 2.026304819998102,
      "deflection": 0.004006839852273456,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.245)"
      },
      "parent_node_id": "node_1269",
      "improvement_over_parent": null
    },
    "node_1271": {
      "node_id": "node_1271",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1270",
      "improvement_over_parent": null
    },
    "node_1272": {
      "node_id": "node_1272",
      "content": "INITIAL DESIGN (Trace 183)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n\nPerformance:\n  Mass: 157.46 kg\n  Factor of Safety: 0.27\n  Max Deflection: 1.78e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.45589524686807,
      "fos_buckling": 0.2709675549515497,
      "fos_yielding": 0.9640187740543913,
      "deflection": 17756347756285.156,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1273": {
      "node_id": "node_1273",
      "content": "MODIFICATION: Increase 7 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n\nPerformance:\n  Mass: 169.98 kg\n  Factor of Safety: 0.29\n  Max Deflection: 7.49e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.97596499920985,
      "fos_buckling": 0.2905014840229653,
      "fos_yielding": 0.523791039878986,
      "deflection": 74894063882980.22,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.543)"
      },
      "parent_node_id": "node_1272",
      "improvement_over_parent": null
    },
    "node_1274": {
      "node_id": "node_1274",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n\nPerformance:\n  Mass: 196.83 kg\n  Factor of Safety: 0.46\n  Max Deflection: 9.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.83497808579415,
      "fos_buckling": 0.4646527888312276,
      "fos_yielding": 1.3654360567022377,
      "deflection": 0.009107324821838535,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004469)"
      },
      "parent_node_id": "node_1273",
      "improvement_over_parent": null
    },
    "node_1275": {
      "node_id": "node_1275",
      "content": "MODIFICATION: Increase 0 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n\nPerformance:\n  Mass: 205.97 kg\n  Factor of Safety: 0.46\n  Max Deflection: 8.76e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.97035881828702,
      "fos_buckling": 0.464360820547819,
      "fos_yielding": 1.3651693320724008,
      "deflection": 0.008764617336719528,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.486)"
      },
      "parent_node_id": "node_1274",
      "improvement_over_parent": null
    },
    "node_1276": {
      "node_id": "node_1276",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 237.58 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.61e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.57590265250005,
      "fos_buckling": 0.5217970743484215,
      "fos_yielding": 1.572354482625323,
      "deflection": 0.007614465072202574,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.168)"
      },
      "parent_node_id": "node_1275",
      "improvement_over_parent": null
    },
    "node_1277": {
      "node_id": "node_1277",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.16 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.15783382044594,
      "fos_buckling": 1.4360254661034741,
      "fos_yielding": 2.0101740783245092,
      "deflection": 0.004158266595672523,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1276",
      "improvement_over_parent": null
    },
    "node_1278": {
      "node_id": "node_1278",
      "content": "MODIFICATION: Increase 8 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.12674134550974,
      "fos_buckling": 1.522764821016491,
      "fos_yielding": 2.011685574489426,
      "deflection": 0.004042164750509042,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.548)"
      },
      "parent_node_id": "node_1277",
      "improvement_over_parent": null
    },
    "node_1279": {
      "node_id": "node_1279",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1278",
      "improvement_over_parent": null
    },
    "node_1280": {
      "node_id": "node_1280",
      "content": "INITIAL DESIGN (Trace 184)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0021)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0018)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 105.73 kg\n  Factor of Safety: 0.28\n  Max Deflection: 1.66e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 105.72913152163115,
      "fos_buckling": 0.2824702161935376,
      "fos_yielding": 0.8261088594314352,
      "deflection": 0.01661849803980254,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1281": {
      "node_id": "node_1281",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 129.91 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.35e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 129.91244041757682,
      "fos_buckling": 0.34088871498414053,
      "fos_yielding": 1.0135675074441837,
      "deflection": 0.013545554321839947,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.239)"
      },
      "parent_node_id": "node_1280",
      "improvement_over_parent": null
    },
    "node_1282": {
      "node_id": "node_1282",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 159.54 kg\n  Factor of Safety: 0.41\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.5376045885477,
      "fos_buckling": 0.4093476779983091,
      "fos_yielding": 1.242447658307408,
      "deflection": 0.011050844516519408,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.241)"
      },
      "parent_node_id": "node_1281",
      "improvement_over_parent": null
    },
    "node_1283": {
      "node_id": "node_1283",
      "content": "MODIFICATION: Increase 8 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 162.68 kg\n  Factor of Safety: 0.41\n  Max Deflection: 1.10e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.67604416440784,
      "fos_buckling": 0.40925906339785706,
      "fos_yielding": 1.2423046514162512,
      "deflection": 0.011002090760910006,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.195)"
      },
      "parent_node_id": "node_1282",
      "improvement_over_parent": null
    },
    "node_1284": {
      "node_id": "node_1284",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 205.59 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.73e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.59231014492883,
      "fos_buckling": 0.5007564022615065,
      "fos_yielding": 1.5663968670694322,
      "deflection": 0.008727110336186873,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.284)"
      },
      "parent_node_id": "node_1283",
      "improvement_over_parent": null
    },
    "node_1285": {
      "node_id": "node_1285",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 241.06 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.90e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.05974212970332,
      "fos_buckling": 1.2961788910109393,
      "fos_yielding": 1.6565645424105302,
      "deflection": 0.0049005318845191355,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004976)"
      },
      "parent_node_id": "node_1284",
      "improvement_over_parent": null
    },
    "node_1286": {
      "node_id": "node_1286",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.52 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.51961487925445,
      "fos_buckling": 1.5243731072343838,
      "fos_yielding": 2.0146803836424128,
      "deflection": 0.00403693370952994,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.239)"
      },
      "parent_node_id": "node_1285",
      "improvement_over_parent": null
    },
    "node_1287": {
      "node_id": "node_1287",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1286",
      "improvement_over_parent": null
    },
    "node_1288": {
      "node_id": "node_1288",
      "content": "INITIAL DESIGN (Trace 185)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1289": {
      "node_id": "node_1289",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 217.19 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.33e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.18637720541727,
      "fos_buckling": 0.8872215318840563,
      "fos_yielding": 1.1918069364525923,
      "deflection": 0.006326232004137553,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004545)"
      },
      "parent_node_id": "node_1288",
      "improvement_over_parent": null
    },
    "node_1290": {
      "node_id": "node_1290",
      "content": "MODIFICATION: Increase 0 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 222.11 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.00e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.11261349203636,
      "fos_buckling": 0.8869212970195998,
      "fos_yielding": 1.1917336990181364,
      "deflection": 0.005997961742679234,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.220)"
      },
      "parent_node_id": "node_1289",
      "improvement_over_parent": null
    },
    "node_1291": {
      "node_id": "node_1291",
      "content": "MODIFICATION: Increase 2 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 226.25 kg\n  Factor of Safety: 0.89\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.24970835225815,
      "fos_buckling": 0.8866693141783727,
      "fos_yielding": 1.1836493701935236,
      "deflection": 0.005944331202349279,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.267)"
      },
      "parent_node_id": "node_1290",
      "improvement_over_parent": null
    },
    "node_1292": {
      "node_id": "node_1292",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 264.38 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.38473676895694,
      "fos_buckling": 1.0071755005922136,
      "fos_yielding": 1.3883384742608782,
      "deflection": 0.005098059064622982,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.185)"
      },
      "parent_node_id": "node_1291",
      "improvement_over_parent": null
    },
    "node_1293": {
      "node_id": "node_1293",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 290.28 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.2821739113467,
      "fos_buckling": 1.2024364818952253,
      "fos_yielding": 1.3981998133317264,
      "deflection": 0.004125980547897555,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1292",
      "improvement_over_parent": null
    },
    "node_1294": {
      "node_id": "node_1294",
      "content": "MODIFICATION: Increase 6 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0093)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 309.09 kg\n  Factor of Safety: 1.20\n  Max Deflection: 3.91e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 309.0860276933755,
      "fos_buckling": 1.2010572543513467,
      "fos_yielding": 1.3965960398905266,
      "deflection": 0.0039144708521431405,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.504)"
      },
      "parent_node_id": "node_1293",
      "improvement_over_parent": null
    },
    "node_1295": {
      "node_id": "node_1295",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1294",
      "improvement_over_parent": null
    },
    "node_1296": {
      "node_id": "node_1296",
      "content": "INITIAL DESIGN (Trace 186)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1297": {
      "node_id": "node_1297",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 231.36 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.93e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.35669687489977,
      "fos_buckling": 1.009143845880096,
      "fos_yielding": 2.2877842138483677,
      "deflection": 0.005925883675688725,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1296",
      "improvement_over_parent": null
    },
    "node_1298": {
      "node_id": "node_1298",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 264.27 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.2692335065168,
      "fos_buckling": 1.0724400359619908,
      "fos_yielding": 2.2877842138483686,
      "deflection": 0.0048514478752933856,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1297",
      "improvement_over_parent": null
    },
    "node_1299": {
      "node_id": "node_1299",
      "content": "MODIFICATION: Increase 8 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0060)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 268.66 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.81e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.657455824355,
      "fos_buckling": 1.0721176914823898,
      "fos_yielding": 2.2877842138483677,
      "deflection": 0.004814495576400544,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.190)"
      },
      "parent_node_id": "node_1298",
      "improvement_over_parent": null
    },
    "node_1300": {
      "node_id": "node_1300",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0060)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.04 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.03892778518707,
      "fos_buckling": 1.491200235599823,
      "fos_yielding": 2.025043992215134,
      "deflection": 0.0040451760737443285,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1299",
      "improvement_over_parent": null
    },
    "node_1301": {
      "node_id": "node_1301",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1300",
      "improvement_over_parent": null
    },
    "node_1302": {
      "node_id": "node_1302",
      "content": "INITIAL DESIGN (Trace 187)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 187.52 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.24e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.52216209559805,
      "fos_buckling": 0.8844292773189248,
      "fos_yielding": 1.9481980480620682,
      "deflection": 0.0072390007369990085,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1303": {
      "node_id": "node_1303",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 208.27 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.30e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.2726240049747,
      "fos_buckling": 0.8831671680528451,
      "fos_yielding": 1.7308803252632312,
      "deflection": 0.006300326132866788,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004079)"
      },
      "parent_node_id": "node_1302",
      "improvement_over_parent": null
    },
    "node_1304": {
      "node_id": "node_1304",
      "content": "MODIFICATION: Increase 8 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0081)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 226.32 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.00e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.3246394272276,
      "fos_buckling": 0.882072113225868,
      "fos_yielding": 1.7615865492248686,
      "deflection": 0.006002460784603242,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.538)"
      },
      "parent_node_id": "node_1303",
      "improvement_over_parent": null
    },
    "node_1305": {
      "node_id": "node_1305",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0081)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 254.33 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.66e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.33477699209993,
      "fos_buckling": 1.3904863995591585,
      "fos_yielding": 1.7743253133165604,
      "deflection": 0.004657568318008469,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004515)"
      },
      "parent_node_id": "node_1304",
      "improvement_over_parent": null
    },
    "node_1306": {
      "node_id": "node_1306",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0096)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 298.40 kg\n  Factor of Safety: 1.59\n  Max Deflection: 3.98e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 298.39718826599983,
      "fos_buckling": 1.5856537247368185,
      "fos_yielding": 2.081572671107292,
      "deflection": 0.003977689586044926,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_1305",
      "improvement_over_parent": null
    },
    "node_1307": {
      "node_id": "node_1307",
      "content": "MODIFICATION: Increase 0 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0096)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 303.59 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.88e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 303.58534459465227,
      "fos_buckling": 1.5348739577030828,
      "fos_yielding": 2.0805708329793093,
      "deflection": 0.0038793590427936933,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.198)"
      },
      "parent_node_id": "node_1306",
      "improvement_over_parent": null
    },
    "node_1308": {
      "node_id": "node_1308",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1307",
      "improvement_over_parent": null
    },
    "node_1309": {
      "node_id": "node_1309",
      "content": "INITIAL DESIGN (Trace 188)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 173.69 kg\n  Factor of Safety: 0.38\n  Max Deflection: 2.90e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.69083453716914,
      "fos_buckling": 0.38263399972134204,
      "fos_yielding": 1.1247929757819168,
      "deflection": 0.02896131788691311,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1310": {
      "node_id": "node_1310",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 209.83 kg\n  Factor of Safety: 0.45\n  Max Deflection: 2.40e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.8316720244698,
      "fos_buckling": 0.4500497910963689,
      "fos_yielding": 1.3572946580115777,
      "deflection": 0.02399605233710521,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.225)"
      },
      "parent_node_id": "node_1309",
      "improvement_over_parent": null
    },
    "node_1311": {
      "node_id": "node_1311",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 243.26 kg\n  Factor of Safety: 0.51\n  Max Deflection: 2.07e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.261291283522,
      "fos_buckling": 0.508690560286076,
      "fos_yielding": 1.571885694628862,
      "deflection": 0.020716764091169803,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.175)"
      },
      "parent_node_id": "node_1310",
      "improvement_over_parent": null
    },
    "node_1312": {
      "node_id": "node_1312",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 287.84 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.8432224514679,
      "fos_buckling": 1.0361364678040406,
      "fos_yielding": 2.2944057125435995,
      "deflection": 0.005882239782080797,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1311",
      "improvement_over_parent": null
    },
    "node_1313": {
      "node_id": "node_1313",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.06 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.057052485282,
      "fos_buckling": 1.52274600856278,
      "fos_yielding": 2.0111172176079526,
      "deflection": 0.004042842931622561,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_1312",
      "improvement_over_parent": null
    },
    "node_1314": {
      "node_id": "node_1314",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1313",
      "improvement_over_parent": null
    },
    "node_1315": {
      "node_id": "node_1315",
      "content": "INITIAL DESIGN (Trace 189)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 194.74 kg\n  Factor of Safety: 0.77\n  Max Deflection: 8.39e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.7401286970934,
      "fos_buckling": 0.7653788503696436,
      "fos_yielding": 1.6090205010634426,
      "deflection": 0.008387402339693402,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1316": {
      "node_id": "node_1316",
      "content": "MODIFICATION: Increase 8 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 201.30 kg\n  Factor of Safety: 0.77\n  Max Deflection: 8.39e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.2984689405766,
      "fos_buckling": 0.766134888215006,
      "fos_yielding": 1.608733215816791,
      "deflection": 0.008387274458305907,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.462)"
      },
      "parent_node_id": "node_1315",
      "improvement_over_parent": null
    },
    "node_1317": {
      "node_id": "node_1317",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 260.43 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.50e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.43179364506796,
      "fos_buckling": 0.9544885677730532,
      "fos_yielding": 2.077816302969123,
      "deflection": 0.0064956085930607645,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.319)"
      },
      "parent_node_id": "node_1316",
      "improvement_over_parent": null
    },
    "node_1318": {
      "node_id": "node_1318",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n\nPerformance:\n  Mass: 265.15 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.46e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.14729068889125,
      "fos_buckling": 1.4030412545612523,
      "fos_yielding": 1.821039341944356,
      "deflection": 0.004461201620428001,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002962)"
      },
      "parent_node_id": "node_1317",
      "improvement_over_parent": null
    },
    "node_1319": {
      "node_id": "node_1319",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1354592027051,
      "fos_buckling": 1.522481905723169,
      "fos_yielding": 2.0119921263760805,
      "deflection": 0.004041804720584849,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.116)"
      },
      "parent_node_id": "node_1318",
      "improvement_over_parent": null
    },
    "node_1320": {
      "node_id": "node_1320",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1319",
      "improvement_over_parent": null
    },
    "node_1321": {
      "node_id": "node_1321",
      "content": "INITIAL DESIGN (Trace 190)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 139.46 kg\n  Factor of Safety: 0.50\n  Max Deflection: 1.16e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 139.45987767291768,
      "fos_buckling": 0.4962879212158168,
      "fos_yielding": 1.1253073712763755,
      "deflection": 11591129650839.52,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1322": {
      "node_id": "node_1322",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 174.28 kg\n  Factor of Safety: 0.17\n  Max Deflection: 1.30e+14 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.27756655082956,
      "fos_buckling": 0.17425074084514566,
      "fos_yielding": 0.14066342140954693,
      "deflection": 130055456116677.25,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_1321",
      "improvement_over_parent": null
    },
    "node_1323": {
      "node_id": "node_1323",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 198.66 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.45e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.65903851166166,
      "fos_buckling": 0.9036536173053008,
      "fos_yielding": 0.2994996373922926,
      "deflection": 64484888879067.086,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1322",
      "improvement_over_parent": null
    },
    "node_1324": {
      "node_id": "node_1324",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 241.86 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.84e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.8570964491139,
      "fos_buckling": 1.0084614402740417,
      "fos_yielding": 1.998304863945694,
      "deflection": 0.005836207487366745,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1323",
      "improvement_over_parent": null
    },
    "node_1325": {
      "node_id": "node_1325",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 274.77 kg\n  Factor of Safety: 1.25\n  Max Deflection: 4.43e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 274.7696330807309,
      "fos_buckling": 1.2450212165923313,
      "fos_yielding": 2.0138706390178136,
      "deflection": 0.004434201686816191,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1324",
      "improvement_over_parent": null
    },
    "node_1326": {
      "node_id": "node_1326",
      "content": "MODIFICATION: Increase 2 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 280.43 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.35e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 280.42658845147156,
      "fos_buckling": 1.4453052125293007,
      "fos_yielding": 2.01475731649307,
      "deflection": 0.004350719825444255,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.307)"
      },
      "parent_node_id": "node_1325",
      "improvement_over_parent": null
    },
    "node_1327": {
      "node_id": "node_1327",
      "content": "MODIFICATION: Increase 0 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1415855910563,
      "fos_buckling": 1.5224657441730238,
      "fos_yielding": 2.0116396278378366,
      "deflection": 0.004041933246049542,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.656)"
      },
      "parent_node_id": "node_1326",
      "improvement_over_parent": null
    },
    "node_1328": {
      "node_id": "node_1328",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1327",
      "improvement_over_parent": null
    },
    "node_1329": {
      "node_id": "node_1329",
      "content": "INITIAL DESIGN (Trace 191)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 147.78 kg\n  Factor of Safety: 0.70\n  Max Deflection: 9.91e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.78474484215457,
      "fos_buckling": 0.7040833308444222,
      "fos_yielding": 1.4952688944279153,
      "deflection": 0.009911488802270448,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1330": {
      "node_id": "node_1330",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n\nPerformance:\n  Mass: 164.70 kg\n  Factor of Safety: 0.75\n  Max Deflection: 8.27e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 164.69651663865145,
      "fos_buckling": 0.7490617470699825,
      "fos_yielding": 1.495268894427916,
      "deflection": 0.00827414517672733,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003167)"
      },
      "parent_node_id": "node_1329",
      "improvement_over_parent": null
    },
    "node_1331": {
      "node_id": "node_1331",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 203.46 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.71e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.46389610263122,
      "fos_buckling": 0.8983711097539555,
      "fos_yielding": 1.8452334566194084,
      "deflection": 0.006708031323405459,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.252)"
      },
      "parent_node_id": "node_1330",
      "improvement_over_parent": null
    },
    "node_1332": {
      "node_id": "node_1332",
      "content": "MODIFICATION: Increase 1 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 211.95 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.00e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.9465186418717,
      "fos_buckling": 0.8978471879524602,
      "fos_yielding": 1.8452334566194089,
      "deflection": 0.005997092131374382,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.460)"
      },
      "parent_node_id": "node_1331",
      "improvement_over_parent": null
    },
    "node_1333": {
      "node_id": "node_1333",
      "content": "MODIFICATION: Increase 8 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0062)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 220.33 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.63e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.33114288141752,
      "fos_buckling": 1.070415760017739,
      "fos_yielding": 1.8452334566194084,
      "deflection": 0.005633975791175462,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.256)"
      },
      "parent_node_id": "node_1332",
      "improvement_over_parent": null
    },
    "node_1334": {
      "node_id": "node_1334",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0062)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n\nPerformance:\n  Mass: 239.97 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.88e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.9707857066074,
      "fos_buckling": 1.282018031596514,
      "fos_yielding": 1.6553570541870306,
      "deflection": 0.004879098162960202,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003844)"
      },
      "parent_node_id": "node_1333",
      "improvement_over_parent": null
    },
    "node_1335": {
      "node_id": "node_1335",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0079)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 297.91 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.94e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 297.90822569008907,
      "fos_buckling": 1.5329445985845231,
      "fos_yielding": 2.053060688377359,
      "deflection": 0.0039436994265880255,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.266)"
      },
      "parent_node_id": "node_1334",
      "improvement_over_parent": null
    },
    "node_1336": {
      "node_id": "node_1336",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1335",
      "improvement_over_parent": null
    },
    "node_1337": {
      "node_id": "node_1337",
      "content": "INITIAL DESIGN (Trace 192)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 160.83 kg\n  Factor of Safety: 0.41\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.83000321992205,
      "fos_buckling": 0.40519893889744263,
      "fos_yielding": 1.2284258128098868,
      "deflection": 0.011126499803822784,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1338": {
      "node_id": "node_1338",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 193.11 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.28e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.11225872342635,
      "fos_buckling": 0.4748808541622061,
      "fos_yielding": 1.4724193815178368,
      "deflection": 0.009283842551367015,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.215)"
      },
      "parent_node_id": "node_1337",
      "improvement_over_parent": null
    },
    "node_1339": {
      "node_id": "node_1339",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n\nPerformance:\n  Mass: 226.49 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.21e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.4860792722322,
      "fos_buckling": 1.2291401320934945,
      "fos_yielding": 1.5566649278033144,
      "deflection": 0.005211138140269423,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004661)"
      },
      "parent_node_id": "node_1338",
      "improvement_over_parent": null
    },
    "node_1340": {
      "node_id": "node_1340",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.13731641437687,
      "fos_buckling": 1.5224646353688278,
      "fos_yielding": 2.0117445217884757,
      "deflection": 0.0040418724898577205,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.323)"
      },
      "parent_node_id": "node_1339",
      "improvement_over_parent": null
    },
    "node_1341": {
      "node_id": "node_1341",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1340",
      "improvement_over_parent": null
    },
    "node_1342": {
      "node_id": "node_1342",
      "content": "INITIAL DESIGN (Trace 193)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 138.18 kg\n  Factor of Safety: 0.22\n  Max Deflection: 1.07e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 138.1838066731219,
      "fos_buckling": 0.2174844580493354,
      "fos_yielding": 0.9266500025468587,
      "deflection": 10683514096333.982,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1343": {
      "node_id": "node_1343",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n\nPerformance:\n  Mass: 141.45 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.24e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.45277768020605,
      "fos_buckling": 0.3965070794439647,
      "fos_yielding": 1.1981016671491047,
      "deflection": 0.012435242515732267,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002001)"
      },
      "parent_node_id": "node_1342",
      "improvement_over_parent": null
    },
    "node_1344": {
      "node_id": "node_1344",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n\nPerformance:\n  Mass: 156.74 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.14e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 156.73756841154582,
      "fos_buckling": 0.39608888413111026,
      "fos_yielding": 1.1974298390983074,
      "deflection": 0.011414229605525015,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002943)"
      },
      "parent_node_id": "node_1343",
      "improvement_over_parent": null
    },
    "node_1345": {
      "node_id": "node_1345",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n\nPerformance:\n  Mass: 203.81 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.80e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.80673666213323,
      "fos_buckling": 0.497116271175075,
      "fos_yielding": 1.553056726781073,
      "deflection": 0.008802072085080683,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.323)"
      },
      "parent_node_id": "node_1344",
      "improvement_over_parent": null
    },
    "node_1346": {
      "node_id": "node_1346",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 250.21 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.20540343582215,
      "fos_buckling": 0.5887356070606123,
      "fos_yielding": 1.9018481023627665,
      "deflection": 0.007189033557870162,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.250)"
      },
      "parent_node_id": "node_1345",
      "improvement_over_parent": null
    },
    "node_1347": {
      "node_id": "node_1347",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.40 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.40346137327435,
      "fos_buckling": 1.5237436612823487,
      "fos_yielding": 2.013844436793647,
      "deflection": 0.00403833005485179,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1346",
      "improvement_over_parent": null
    },
    "node_1348": {
      "node_id": "node_1348",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1347",
      "improvement_over_parent": null
    },
    "node_1349": {
      "node_id": "node_1349",
      "content": "INITIAL DESIGN (Trace 194)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 158.18 kg\n  Factor of Safety: 0.68\n  Max Deflection: 8.19e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 158.1824504062353,
      "fos_buckling": 0.6825763427780919,
      "fos_yielding": 1.3471203752299927,
      "deflection": 0.008190671437814752,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1350": {
      "node_id": "node_1350",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n\nPerformance:\n  Mass: 172.53 kg\n  Factor of Safety: 0.97\n  Max Deflection: 6.82e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.52947690020738,
      "fos_buckling": 0.9691696675204169,
      "fos_yielding": 1.1873107268467735,
      "deflection": 0.006819458687403053,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002753)"
      },
      "parent_node_id": "node_1349",
      "improvement_over_parent": null
    },
    "node_1351": {
      "node_id": "node_1351",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n\nPerformance:\n  Mass: 192.89 kg\n  Factor of Safety: 1.07\n  Max Deflection: 6.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 192.89453891315506,
      "fos_buckling": 1.0696954361286957,
      "fos_yielding": 1.3268484437355115,
      "deflection": 0.006106730535361638,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.125)"
      },
      "parent_node_id": "node_1350",
      "improvement_over_parent": null
    },
    "node_1352": {
      "node_id": "node_1352",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n\nPerformance:\n  Mass: 215.84 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.46e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.84490606613042,
      "fos_buckling": 1.179515005992416,
      "fos_yielding": 1.483946524059612,
      "deflection": 0.005464709412530074,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.127)"
      },
      "parent_node_id": "node_1351",
      "improvement_over_parent": null
    },
    "node_1353": {
      "node_id": "node_1353",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 243.67 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.67356492782574,
      "fos_buckling": 1.3077681465569162,
      "fos_yielding": 1.6742190074271928,
      "deflection": 0.004848450131599012,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.139)"
      },
      "parent_node_id": "node_1352",
      "improvement_over_parent": null
    },
    "node_1354": {
      "node_id": "node_1354",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 292.94 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.9368473012375,
      "fos_buckling": 1.5216865754837363,
      "fos_yielding": 2.0104612933079866,
      "deflection": 0.0040446235864222795,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.222)"
      },
      "parent_node_id": "node_1353",
      "improvement_over_parent": null
    },
    "node_1355": {
      "node_id": "node_1355",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1354",
      "improvement_over_parent": null
    },
    "node_1356": {
      "node_id": "node_1356",
      "content": "INITIAL DESIGN (Trace 195)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 206.44 kg\n  Factor of Safety: 0.75\n  Max Deflection: 7.13e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.43755844478434,
      "fos_buckling": 0.750164228249862,
      "fos_yielding": 2.074970146276028,
      "deflection": 0.007129825923429612,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1357": {
      "node_id": "node_1357",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n\nPerformance:\n  Mass: 209.53 kg\n  Factor of Safety: 0.75\n  Max Deflection: 6.22e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.53273260240385,
      "fos_buckling": 0.7498448478548668,
      "fos_yielding": 2.074970146276028,
      "deflection": 0.006217490464307178,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001889)"
      },
      "parent_node_id": "node_1356",
      "improvement_over_parent": null
    },
    "node_1358": {
      "node_id": "node_1358",
      "content": "MODIFICATION: Increase 8 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n\nPerformance:\n  Mass: 220.23 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.58e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.23444204007365,
      "fos_buckling": 0.9818336635198214,
      "fos_yielding": 2.074970146276028,
      "deflection": 0.0055840337810264895,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.397)"
      },
      "parent_node_id": "node_1357",
      "improvement_over_parent": null
    },
    "node_1359": {
      "node_id": "node_1359",
      "content": "MODIFICATION: Increase 5 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0065)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n\nPerformance:\n  Mass: 224.75 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.58e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.74617971442729,
      "fos_buckling": 0.9818336635198214,
      "fos_yielding": 2.782221717936719,
      "deflection": 0.0055840337810264895,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.572)"
      },
      "parent_node_id": "node_1358",
      "improvement_over_parent": null
    },
    "node_1360": {
      "node_id": "node_1360",
      "content": "MODIFICATION: Increase 9 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0065)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 225.94 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.57e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.93700346977056,
      "fos_buckling": 0.9816729835991362,
      "fos_yielding": 2.7696773628559876,
      "deflection": 0.0055676203025703495,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.414)"
      },
      "parent_node_id": "node_1359",
      "improvement_over_parent": null
    },
    "node_1361": {
      "node_id": "node_1361",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0072)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0062)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n\nPerformance:\n  Mass: 249.42 kg\n  Factor of Safety: 1.06\n  Max Deflection: 5.05e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.41760205852825,
      "fos_buckling": 1.064182030473205,
      "fos_yielding": 3.052475204990259,
      "deflection": 0.005049919328350017,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.114)"
      },
      "parent_node_id": "node_1360",
      "improvement_over_parent": null
    },
    "node_1362": {
      "node_id": "node_1362",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0072)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0062)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 280.40 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 280.39614810760463,
      "fos_buckling": 1.3956396260154658,
      "fos_yielding": 2.971108517959569,
      "deflection": 0.004161714944213663,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1361",
      "improvement_over_parent": null
    },
    "node_1363": {
      "node_id": "node_1363",
      "content": "MODIFICATION: Increase 2 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0072)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0062)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 288.56 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.5599300757775,
      "fos_buckling": 1.4503906517075973,
      "fos_yielding": 2.972794757320763,
      "deflection": 0.004085590874757342,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.504)"
      },
      "parent_node_id": "node_1362",
      "improvement_over_parent": null
    },
    "node_1364": {
      "node_id": "node_1364",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1363",
      "improvement_over_parent": null
    },
    "node_1365": {
      "node_id": "node_1365",
      "content": "INITIAL DESIGN (Trace 196)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0020)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0017)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0017)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0013)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0011)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0016)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0018)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0021)]\n\nPerformance:\n  Mass: 94.49 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.33e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 94.49038887983937,
      "fos_buckling": 0.4358334931137582,
      "fos_yielding": 0.8255509555296201,
      "deflection": 0.013322023338216592,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1366": {
      "node_id": "node_1366",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0022)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0021)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0027)]\n\nPerformance:\n  Mass: 120.32 kg\n  Factor of Safety: 0.55\n  Max Deflection: 1.05e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 120.32117965514485,
      "fos_buckling": 0.5452071810180326,
      "fos_yielding": 1.0510101261489804,
      "deflection": 0.010479236863501266,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.284)"
      },
      "parent_node_id": "node_1365",
      "improvement_over_parent": null
    },
    "node_1367": {
      "node_id": "node_1367",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 151.14 kg\n  Factor of Safety: 0.67\n  Max Deflection: 8.36e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.13732699800477,
      "fos_buckling": 0.670257341033782,
      "fos_yielding": 1.3198589041604016,
      "deflection": 0.008358919938411855,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.269)"
      },
      "parent_node_id": "node_1366",
      "improvement_over_parent": null
    },
    "node_1368": {
      "node_id": "node_1368",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 168.58 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.50e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.57501246226445,
      "fos_buckling": 0.7384125644272482,
      "fos_yielding": 1.4719304008045067,
      "deflection": 0.007502552474867629,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.122)"
      },
      "parent_node_id": "node_1367",
      "improvement_over_parent": null
    },
    "node_1369": {
      "node_id": "node_1369",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 190.39 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.65e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.3925311584846,
      "fos_buckling": 0.821046184614992,
      "fos_yielding": 1.6621369488685953,
      "deflection": 0.006652005106727826,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_1368",
      "improvement_over_parent": null
    },
    "node_1370": {
      "node_id": "node_1370",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 230.29 kg\n  Factor of Safety: 0.96\n  Max Deflection: 5.51e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.29076679637876,
      "fos_buckling": 0.9646090243706885,
      "fos_yielding": 2.0097975821177476,
      "deflection": 0.0055134252038094725,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.227)"
      },
      "parent_node_id": "node_1369",
      "improvement_over_parent": null
    },
    "node_1371": {
      "node_id": "node_1371",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n\nPerformance:\n  Mass: 257.51 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.59e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.5100016272768,
      "fos_buckling": 1.3695606022255842,
      "fos_yielding": 1.7686197264650616,
      "deflection": 0.004591720519223372,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004534)"
      },
      "parent_node_id": "node_1370",
      "improvement_over_parent": null
    },
    "node_1372": {
      "node_id": "node_1372",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1366482238672,
      "fos_buckling": 1.5225445005973066,
      "fos_yielding": 2.0116952943195994,
      "deflection": 0.00404199924436845,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.152)"
      },
      "parent_node_id": "node_1371",
      "improvement_over_parent": null
    },
    "node_1373": {
      "node_id": "node_1373",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1372",
      "improvement_over_parent": null
    },
    "node_1374": {
      "node_id": "node_1374",
      "content": "INITIAL DESIGN (Trace 197)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 184.26 kg\n  Factor of Safety: 0.81\n  Max Deflection: 9.15e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.25540725191718,
      "fos_buckling": 0.8051974464022158,
      "fos_yielding": 1.7215565018086032,
      "deflection": 0.009149905451521894,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1375": {
      "node_id": "node_1375",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n\nPerformance:\n  Mass: 188.18 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.26e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.17850864709882,
      "fos_buckling": 0.8470207357837412,
      "fos_yielding": 1.7215565018086032,
      "deflection": 0.007256552037435063,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002429)"
      },
      "parent_node_id": "node_1374",
      "improvement_over_parent": null
    },
    "node_1376": {
      "node_id": "node_1376",
      "content": "MODIFICATION: Increase 1 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n\nPerformance:\n  Mass: 194.27 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.72e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.2739068719874,
      "fos_buckling": 0.8466653618000547,
      "fos_yielding": 1.7215565018086032,
      "deflection": 0.006722518203122581,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.321)"
      },
      "parent_node_id": "node_1375",
      "improvement_over_parent": null
    },
    "node_1377": {
      "node_id": "node_1377",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 229.83 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.69e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.82794689160932,
      "fos_buckling": 0.9752025374486762,
      "fos_yielding": 2.035088330113421,
      "deflection": 0.005694152318267207,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.198)"
      },
      "parent_node_id": "node_1376",
      "improvement_over_parent": null
    },
    "node_1378": {
      "node_id": "node_1378",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 251.51 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.80e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.50629808710727,
      "fos_buckling": 1.3658354866747655,
      "fos_yielding": 1.7936290326924196,
      "deflection": 0.004798844635283035,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004277)"
      },
      "parent_node_id": "node_1377",
      "improvement_over_parent": null
    },
    "node_1379": {
      "node_id": "node_1379",
      "content": "MODIFICATION: Increase 0 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 260.84 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.53e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.8402799033759,
      "fos_buckling": 1.3840723876323473,
      "fos_yielding": 1.7915168175700964,
      "deflection": 0.004533710923448989,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.484)"
      },
      "parent_node_id": "node_1378",
      "improvement_over_parent": null
    },
    "node_1380": {
      "node_id": "node_1380",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.59 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.59472712169946,
      "fos_buckling": 1.5242801240226025,
      "fos_yielding": 2.0149946542145676,
      "deflection": 0.004035570937228956,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_1379",
      "improvement_over_parent": null
    },
    "node_1381": {
      "node_id": "node_1381",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1380",
      "improvement_over_parent": null
    },
    "node_1382": {
      "node_id": "node_1382",
      "content": "INITIAL DESIGN (Trace 198)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 143.38 kg\n  Factor of Safety: 0.38\n  Max Deflection: 1.20e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 143.37845292165719,
      "fos_buckling": 0.3826018608641128,
      "fos_yielding": 1.0881863084322183,
      "deflection": 0.011966328866467068,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1383": {
      "node_id": "node_1383",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 174.13 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.22e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.13380648234352,
      "fos_buckling": 0.7378130504331017,
      "fos_yielding": 1.3815598191224132,
      "deflection": 0.007219180449190194,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004196)"
      },
      "parent_node_id": "node_1382",
      "improvement_over_parent": null
    },
    "node_1384": {
      "node_id": "node_1384",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 197.71 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.37e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.71449803079025,
      "fos_buckling": 0.8229406800641631,
      "fos_yielding": 1.56741674317186,
      "deflection": 0.006368786447426668,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.145)"
      },
      "parent_node_id": "node_1383",
      "improvement_over_parent": null
    },
    "node_1385": {
      "node_id": "node_1385",
      "content": "MODIFICATION: Increase 2 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 203.86 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.37e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.86225053133938,
      "fos_buckling": 0.822592664404504,
      "fos_yielding": 1.5673181407780834,
      "deflection": 0.006371384065725989,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.466)"
      },
      "parent_node_id": "node_1384",
      "improvement_over_parent": null
    },
    "node_1386": {
      "node_id": "node_1386",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 229.64 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.64230461725566,
      "fos_buckling": 1.2437284555865962,
      "fos_yielding": 1.5782396537669139,
      "deflection": 0.005140585207947217,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004129)"
      },
      "parent_node_id": "node_1385",
      "improvement_over_parent": null
    },
    "node_1387": {
      "node_id": "node_1387",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2384788005298,
      "fos_buckling": 1.5228897314663425,
      "fos_yielding": 2.012426536514942,
      "deflection": 0.0040405986869412255,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_1386",
      "improvement_over_parent": null
    },
    "node_1388": {
      "node_id": "node_1388",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1387",
      "improvement_over_parent": null
    },
    "node_1389": {
      "node_id": "node_1389",
      "content": "INITIAL DESIGN (Trace 199)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0019)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 115.66 kg\n  Factor of Safety: 0.36\n  Max Deflection: 1.39e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 115.66295957496776,
      "fos_buckling": 0.3588855754928191,
      "fos_yielding": 1.0718018295721203,
      "deflection": 0.013897806265469064,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1390": {
      "node_id": "node_1390",
      "content": "MODIFICATION: Increase 0 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 122.68 kg\n  Factor of Safety: 0.36\n  Max Deflection: 1.39e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 122.68419264956921,
      "fos_buckling": 0.35871130006746055,
      "fos_yielding": 1.0715253242382838,
      "deflection": 0.01390361217788909,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.613)"
      },
      "parent_node_id": "node_1389",
      "improvement_over_parent": null
    },
    "node_1391": {
      "node_id": "node_1391",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 140.21 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.22e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 140.20968850057585,
      "fos_buckling": 0.4040098644368599,
      "fos_yielding": 1.2233738589332601,
      "deflection": 0.012178793458680857,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.151)"
      },
      "parent_node_id": "node_1390",
      "improvement_over_parent": null
    },
    "node_1392": {
      "node_id": "node_1392",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 162.27 kg\n  Factor of Safety: 0.46\n  Max Deflection: 1.05e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.26946883922253,
      "fos_buckling": 0.4589385003743967,
      "fos_yielding": 1.4140800494838572,
      "deflection": 0.010537349401569423,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.168)"
      },
      "parent_node_id": "node_1391",
      "improvement_over_parent": null
    },
    "node_1393": {
      "node_id": "node_1393",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n\nPerformance:\n  Mass: 194.26 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.52e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.2563294911377,
      "fos_buckling": 0.8354461696617586,
      "fos_yielding": 1.6959793852853533,
      "deflection": 0.0065211714516821674,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004454)"
      },
      "parent_node_id": "node_1392",
      "improvement_over_parent": null
    },
    "node_1394": {
      "node_id": "node_1394",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 217.68 kg\n  Factor of Safety: 0.92\n  Max Deflection: 5.83e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.68141069874417,
      "fos_buckling": 0.9203653744213497,
      "fos_yielding": 1.9001306995924787,
      "deflection": 0.005828045193293507,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.130)"
      },
      "parent_node_id": "node_1393",
      "improvement_over_parent": null
    },
    "node_1395": {
      "node_id": "node_1395",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 243.39 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.393033129381,
      "fos_buckling": 1.306575929633363,
      "fos_yielding": 1.672522207573631,
      "deflection": 0.004853955857612035,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004263)"
      },
      "parent_node_id": "node_1394",
      "improvement_over_parent": null
    },
    "node_1396": {
      "node_id": "node_1396",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2590850082384,
      "fos_buckling": 1.5231090523143334,
      "fos_yielding": 2.012918067963394,
      "deflection": 0.004040251980444462,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.225)"
      },
      "parent_node_id": "node_1395",
      "improvement_over_parent": null
    },
    "node_1397": {
      "node_id": "node_1397",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1396",
      "improvement_over_parent": null
    },
    "node_1398": {
      "node_id": "node_1398",
      "content": "INITIAL DESIGN (Trace 200)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0014)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 179.24 kg\n  Factor of Safety: 0.75\n  Max Deflection: 6.64e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.23682671426695,
      "fos_buckling": 0.7492329338339546,
      "fos_yielding": 1.172913860616629,
      "deflection": 0.006637658730321729,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1399": {
      "node_id": "node_1399",
      "content": "MODIFICATION: Increase 4 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 179.94 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.57e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.93839837815216,
      "fos_buckling": 0.913557960865951,
      "fos_yielding": 1.2439108542961839,
      "deflection": 0.006567450690292232,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.266)"
      },
      "parent_node_id": "node_1398",
      "improvement_over_parent": null
    },
    "node_1400": {
      "node_id": "node_1400",
      "content": "MODIFICATION: Increase 4 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 180.83 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.51e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.8347817419985,
      "fos_buckling": 1.010518123596036,
      "fos_yielding": 1.2442461423756814,
      "deflection": 0.006509405911459151,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.274)"
      },
      "parent_node_id": "node_1399",
      "improvement_over_parent": null
    },
    "node_1401": {
      "node_id": "node_1401",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 206.00 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.72e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.99599465435017,
      "fos_buckling": 1.132838184249785,
      "fos_yielding": 1.4165647081716852,
      "deflection": 0.005722700642247803,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.148)"
      },
      "parent_node_id": "node_1400",
      "improvement_over_parent": null
    },
    "node_1402": {
      "node_id": "node_1402",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 232.09 kg\n  Factor of Safety: 1.26\n  Max Deflection: 5.09e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.0912313216845,
      "fos_buckling": 1.25504308224378,
      "fos_yielding": 1.595073386611754,
      "deflection": 0.005086981978125706,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.136)"
      },
      "parent_node_id": "node_1401",
      "improvement_over_parent": null
    },
    "node_1403": {
      "node_id": "node_1403",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.19055663023215,
      "fos_buckling": 1.522746562380664,
      "fos_yielding": 2.012212270897031,
      "deflection": 0.004041181251501012,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.289)"
      },
      "parent_node_id": "node_1402",
      "improvement_over_parent": null
    },
    "node_1404": {
      "node_id": "node_1404",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1403",
      "improvement_over_parent": null
    },
    "node_1405": {
      "node_id": "node_1405",
      "content": "INITIAL DESIGN (Trace 201)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 166.96 kg\n  Factor of Safety: 0.72\n  Max Deflection: 9.25e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.9576395281551,
      "fos_buckling": 0.7223218348555158,
      "fos_yielding": 1.5255892575110754,
      "deflection": 0.009252230841252703,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1406": {
      "node_id": "node_1406",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 187.60 kg\n  Factor of Safety: 0.72\n  Max Deflection: 9.25e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.59981053636352,
      "fos_buckling": 0.7192947597718028,
      "fos_yielding": 1.5198047424645267,
      "deflection": 0.009250918533403653,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003371)"
      },
      "parent_node_id": "node_1405",
      "improvement_over_parent": null
    },
    "node_1407": {
      "node_id": "node_1407",
      "content": "MODIFICATION: Increase 1 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 191.90 kg\n  Factor of Safety: 0.73\n  Max Deflection: 8.80e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 191.9007671425589,
      "fos_buckling": 0.7346319161283908,
      "fos_yielding": 1.5339162678766742,
      "deflection": 0.008795705379480125,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.239)"
      },
      "parent_node_id": "node_1406",
      "improvement_over_parent": null
    },
    "node_1408": {
      "node_id": "node_1408",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n\nPerformance:\n  Mass: 195.37 kg\n  Factor of Safety: 1.08\n  Max Deflection: 6.03e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.37470895301178,
      "fos_buckling": 1.0816904163034406,
      "fos_yielding": 1.3438259787678937,
      "deflection": 0.006030054147802876,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002134)"
      },
      "parent_node_id": "node_1407",
      "improvement_over_parent": null
    },
    "node_1409": {
      "node_id": "node_1409",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 233.94 kg\n  Factor of Safety: 1.26\n  Max Deflection: 5.05e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.94031492709072,
      "fos_buckling": 1.2634644823962045,
      "fos_yielding": 1.6076884543972434,
      "deflection": 0.005047297042400087,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.212)"
      },
      "parent_node_id": "node_1408",
      "improvement_over_parent": null
    },
    "node_1410": {
      "node_id": "node_1410",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.39 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3876928439161,
      "fos_buckling": 1.523501237845891,
      "fos_yielding": 2.0135244011002498,
      "deflection": 0.004038496797230183,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.279)"
      },
      "parent_node_id": "node_1409",
      "improvement_over_parent": null
    },
    "node_1411": {
      "node_id": "node_1411",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1410",
      "improvement_over_parent": null
    },
    "node_1412": {
      "node_id": "node_1412",
      "content": "INITIAL DESIGN (Trace 202)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 132.71 kg\n  Factor of Safety: 0.12\n  Max Deflection: 8.37e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 132.7119931404395,
      "fos_buckling": 0.1194149875535362,
      "fos_yielding": 0.14066342140954693,
      "deflection": 83698519863941.88,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1413": {
      "node_id": "node_1413",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n\nPerformance:\n  Mass: 162.37 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.92e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.37438116816529,
      "fos_buckling": 0.7354247061374846,
      "fos_yielding": 1.3708440900219356,
      "deflection": 0.007917591926024403,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004110)"
      },
      "parent_node_id": "node_1412",
      "improvement_over_parent": null
    },
    "node_1414": {
      "node_id": "node_1414",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n\nPerformance:\n  Mass: 186.71 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.89e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.70711379860234,
      "fos_buckling": 0.8289768332095914,
      "fos_yielding": 1.5743800455288113,
      "deflection": 0.006894796135317435,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.160)"
      },
      "parent_node_id": "node_1413",
      "improvement_over_parent": null
    },
    "node_1415": {
      "node_id": "node_1415",
      "content": "MODIFICATION: Increase 3 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n\nPerformance:\n  Mass: 189.98 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.78e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.97948105770712,
      "fos_buckling": 0.8287900510599767,
      "fos_yielding": 1.5584841355841281,
      "deflection": 0.0067798608381187415,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.297)"
      },
      "parent_node_id": "node_1414",
      "improvement_over_parent": null
    },
    "node_1416": {
      "node_id": "node_1416",
      "content": "MODIFICATION: Increase 9 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0071)]\n\nPerformance:\n  Mass: 205.06 kg\n  Factor of Safety: 0.97\n  Max Deflection: 6.16e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.055549032794,
      "fos_buckling": 0.968970245240014,
      "fos_yielding": 1.5582305531092588,
      "deflection": 0.006160842909739622,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.493)"
      },
      "parent_node_id": "node_1415",
      "improvement_over_parent": null
    },
    "node_1417": {
      "node_id": "node_1417",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0092)]\n\nPerformance:\n  Mass: 259.58 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.88e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.5828612331163,
      "fos_buckling": 1.2013884109360067,
      "fos_yielding": 1.9735048584509682,
      "deflection": 0.004880477435094762,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.294)"
      },
      "parent_node_id": "node_1416",
      "improvement_over_parent": null
    },
    "node_1418": {
      "node_id": "node_1418",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0092)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 292.50 kg\n  Factor of Safety: 1.17\n  Max Deflection: 4.19e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.4953978647333,
      "fos_buckling": 1.1746548873327403,
      "fos_yielding": 1.9832367283263732,
      "deflection": 0.004192756927492773,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1417",
      "improvement_over_parent": null
    },
    "node_1419": {
      "node_id": "node_1419",
      "content": "MODIFICATION: Increase 3 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0092)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 297.92 kg\n  Factor of Safety: 1.21\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 297.9204645340256,
      "fos_buckling": 1.21474450375697,
      "fos_yielding": 1.9654186330526418,
      "deflection": 0.004117147577836245,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.314)"
      },
      "parent_node_id": "node_1418",
      "improvement_over_parent": null
    },
    "node_1420": {
      "node_id": "node_1420",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1419",
      "improvement_over_parent": null
    },
    "node_1421": {
      "node_id": "node_1421",
      "content": "INITIAL DESIGN (Trace 203)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0027)]\n\nPerformance:\n  Mass: 129.14 kg\n  Factor of Safety: 1.01\n  Max Deflection: 7.91e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 129.13710283439363,
      "fos_buckling": 1.007770087472561,
      "fos_yielding": 1.1775636923724162,
      "deflection": 7914015719127.082,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1422": {
      "node_id": "node_1422",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0027)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n\nPerformance:\n  Mass: 147.61 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.22e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.6082422512483,
      "fos_buckling": 0.4443226369982843,
      "fos_yielding": 1.2445808662497708,
      "deflection": 0.012192034726848107,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003478)"
      },
      "parent_node_id": "node_1421",
      "improvement_over_parent": null
    },
    "node_1423": {
      "node_id": "node_1423",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 170.06 kg\n  Factor of Safety: 0.50\n  Max Deflection: 1.06e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.0600074637519,
      "fos_buckling": 0.5013667591023553,
      "fos_yielding": 1.4363652495196513,
      "deflection": 0.010591837874094408,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.163)"
      },
      "parent_node_id": "node_1422",
      "improvement_over_parent": null
    },
    "node_1424": {
      "node_id": "node_1424",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 207.31 kg\n  Factor of Safety: 0.59\n  Max Deflection: 8.70e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.3061447074739,
      "fos_buckling": 0.5899829130291786,
      "fos_yielding": 1.756279585609196,
      "deflection": 0.008701392182285899,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.239)"
      },
      "parent_node_id": "node_1423",
      "improvement_over_parent": null
    },
    "node_1425": {
      "node_id": "node_1425",
      "content": "MODIFICATION: Increase 8 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0081)]\n\nPerformance:\n  Mass: 220.85 kg\n  Factor of Safety: 0.73\n  Max Deflection: 8.08e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.85280117543275,
      "fos_buckling": 0.7339953254999345,
      "fos_yielding": 1.756279585609197,
      "deflection": 0.008083298607117281,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.613)"
      },
      "parent_node_id": "node_1424",
      "improvement_over_parent": null
    },
    "node_1426": {
      "node_id": "node_1426",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0081)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 245.23 kg\n  Factor of Safety: 0.81\n  Max Deflection: 7.03e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.23427313626485,
      "fos_buckling": 0.811738445118351,
      "fos_yielding": 1.5335374586101016,
      "deflection": 0.00702543637624611,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1425",
      "improvement_over_parent": null
    },
    "node_1427": {
      "node_id": "node_1427",
      "content": "MODIFICATION: Increase 6 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0070)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0081)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 254.27 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.96e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.2732797673475,
      "fos_buckling": 0.8112354606299746,
      "fos_yielding": 1.5207488752142244,
      "deflection": 0.006962201463306804,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.332)"
      },
      "parent_node_id": "node_1426",
      "improvement_over_parent": null
    },
    "node_1428": {
      "node_id": "node_1428",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0070)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0081)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 297.47 kg\n  Factor of Safety: 1.16\n  Max Deflection: 4.31e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 297.47133770479974,
      "fos_buckling": 1.158255084745087,
      "fos_yielding": 1.5010185706056982,
      "deflection": 0.004306445964500418,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1427",
      "improvement_over_parent": null
    },
    "node_1429": {
      "node_id": "node_1429",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1428",
      "improvement_over_parent": null
    },
    "node_1430": {
      "node_id": "node_1430",
      "content": "INITIAL DESIGN (Trace 204)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n\nPerformance:\n  Mass: 128.14 kg\n  Factor of Safety: 0.48\n  Max Deflection: 1.25e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 128.14125225524896,
      "fos_buckling": 0.4758463009020984,
      "fos_yielding": 1.227393784706757,
      "deflection": 0.012523697224984852,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1431": {
      "node_id": "node_1431",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 155.49 kg\n  Factor of Safety: 0.57\n  Max Deflection: 1.03e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.49201155867493,
      "fos_buckling": 0.5696140443554725,
      "fos_yielding": 1.4880809540671358,
      "deflection": 0.010323429297884283,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.225)"
      },
      "parent_node_id": "node_1430",
      "improvement_over_parent": null
    },
    "node_1432": {
      "node_id": "node_1432",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 188.26 kg\n  Factor of Safety: 0.68\n  Max Deflection: 8.53e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.25525483933532,
      "fos_buckling": 0.6783292461103911,
      "fos_yielding": 1.7997001228821117,
      "deflection": 0.00852906053960018,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.225)"
      },
      "parent_node_id": "node_1431",
      "improvement_over_parent": null
    },
    "node_1433": {
      "node_id": "node_1433",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 192.36 kg\n  Factor of Safety: 0.68\n  Max Deflection: 6.97e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 192.35590685781986,
      "fos_buckling": 0.6779462606694039,
      "fos_yielding": 1.7997001228821117,
      "deflection": 0.0069713659721153546,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002547)"
      },
      "parent_node_id": "node_1432",
      "improvement_over_parent": null
    },
    "node_1434": {
      "node_id": "node_1434",
      "content": "MODIFICATION: Increase 9 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0035)]\n\nPerformance:\n  Mass: 193.72 kg\n  Factor of Safety: 0.68\n  Max Deflection: 6.95e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.7233339956302,
      "fos_buckling": 0.6778186442629321,
      "fos_yielding": 1.7997001228821117,
      "deflection": 0.006952039962707845,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.368)"
      },
      "parent_node_id": "node_1433",
      "improvement_over_parent": null
    },
    "node_1435": {
      "node_id": "node_1435",
      "content": "MODIFICATION: Increase 0 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0035)]\n\nPerformance:\n  Mass: 198.59 kg\n  Factor of Safety: 0.68\n  Max Deflection: 6.81e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.591229429,
      "fos_buckling": 0.6775916126609998,
      "fos_yielding": 1.7997001228821117,
      "deflection": 0.006808780741955364,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.239)"
      },
      "parent_node_id": "node_1434",
      "improvement_over_parent": null
    },
    "node_1436": {
      "node_id": "node_1436",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0035)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 222.95 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.34e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.9493918605699,
      "fos_buckling": 1.0417408694505563,
      "fos_yielding": 1.551201130908631,
      "deflection": 0.005337819457941433,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004022)"
      },
      "parent_node_id": "node_1435",
      "improvement_over_parent": null
    },
    "node_1437": {
      "node_id": "node_1437",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0045)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 283.81 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.21e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.810300498122,
      "fos_buckling": 1.2897327915923378,
      "fos_yielding": 1.9717966644936775,
      "deflection": 0.00420695913665336,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_1436",
      "improvement_over_parent": null
    },
    "node_1438": {
      "node_id": "node_1438",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1437",
      "improvement_over_parent": null
    },
    "node_1439": {
      "node_id": "node_1439",
      "content": "INITIAL DESIGN (Trace 205)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 227.47 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.36e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.4693768871204,
      "fos_buckling": 0.9680187590999142,
      "fos_yielding": 1.2361812736226974,
      "deflection": 0.00535511328662517,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1440": {
      "node_id": "node_1440",
      "content": "MODIFICATION: Increase 5 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 228.68 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.22e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.67664896650734,
      "fos_buckling": 1.0706194388848413,
      "fos_yielding": 1.22745831217761,
      "deflection": 0.005223782606516986,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.565)"
      },
      "parent_node_id": "node_1439",
      "improvement_over_parent": null
    },
    "node_1441": {
      "node_id": "node_1441",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 290.18 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.18358926584017,
      "fos_buckling": 1.3253646681461646,
      "fos_yielding": 1.56318999981107,
      "deflection": 0.004129793131575029,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.295)"
      },
      "parent_node_id": "node_1440",
      "improvement_over_parent": null
    },
    "node_1442": {
      "node_id": "node_1442",
      "content": "MODIFICATION: Increase 5 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 290.98 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.98004656972256,
      "fos_buckling": 1.3224734732886554,
      "fos_yielding": 1.5597800048131765,
      "deflection": 0.004098013999006193,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.198)"
      },
      "parent_node_id": "node_1441",
      "improvement_over_parent": null
    },
    "node_1443": {
      "node_id": "node_1443",
      "content": "MODIFICATION: Increase 6 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.296676062684,
      "fos_buckling": 1.5232489312499808,
      "fos_yielding": 2.014132182264969,
      "deflection": 0.004039713616694359,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.332)"
      },
      "parent_node_id": "node_1442",
      "improvement_over_parent": null
    },
    "node_1444": {
      "node_id": "node_1444",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1443",
      "improvement_over_parent": null
    },
    "node_1445": {
      "node_id": "node_1445",
      "content": "INITIAL DESIGN (Trace 206)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 195.87 kg\n  Factor of Safety: 0.43\n  Max Deflection: 9.70e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.87487929361419,
      "fos_buckling": 0.4315639529623651,
      "fos_yielding": 0.9562285380157085,
      "deflection": 0.009700792616807773,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1446": {
      "node_id": "node_1446",
      "content": "MODIFICATION: Increase 6 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 197.75 kg\n  Factor of Safety: 0.43\n  Max Deflection: 9.43e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.75205268883403,
      "fos_buckling": 0.431563952962365,
      "fos_yielding": 1.252801107757415,
      "deflection": 0.009428736585849248,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.333)"
      },
      "parent_node_id": "node_1445",
      "improvement_over_parent": null
    },
    "node_1447": {
      "node_id": "node_1447",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 248.55 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.5501073112367,
      "fos_buckling": 0.5214147897705558,
      "fos_yielding": 1.5720912141786856,
      "deflection": 0.0075232534609870495,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.282)"
      },
      "parent_node_id": "node_1446",
      "improvement_over_parent": null
    },
    "node_1448": {
      "node_id": "node_1448",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1320384791826,
      "fos_buckling": 1.522800238621861,
      "fos_yielding": 2.0118067491796197,
      "deflection": 0.004041925513304414,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1447",
      "improvement_over_parent": null
    },
    "node_1449": {
      "node_id": "node_1449",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1448",
      "improvement_over_parent": null
    },
    "node_1450": {
      "node_id": "node_1450",
      "content": "INITIAL DESIGN (Trace 207)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0015)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0015)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0013)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0013)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0010)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0009)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0012)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0016)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0014)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0014)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0017)]\n\nPerformance:\n  Mass: 82.69 kg\n  Factor of Safety: 0.49\n  Max Deflection: 1.42e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 82.68863157985058,
      "fos_buckling": 0.49089661239987975,
      "fos_yielding": 0.5702065326846376,
      "deflection": 0.014154192254211821,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1451": {
      "node_id": "node_1451",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0020)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0017)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0017)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0013)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0011)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0016)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0018)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0018)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0021)]\n\nPerformance:\n  Mass: 105.97 kg\n  Factor of Safety: 0.62\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 105.97162107169558,
      "fos_buckling": 0.6203184684573253,
      "fos_yielding": 0.7303771590180221,
      "deflection": 0.011059454664087571,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.290)"
      },
      "parent_node_id": "node_1450",
      "improvement_over_parent": null
    },
    "node_1452": {
      "node_id": "node_1452",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0022)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0024)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0021)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n\nPerformance:\n  Mass: 120.62 kg\n  Factor of Safety: 0.70\n  Max Deflection: 9.72e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 120.61900589826523,
      "fos_buckling": 0.6997697388705636,
      "fos_yielding": 0.8310544640246902,
      "deflection": 0.009724780542954581,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.143)"
      },
      "parent_node_id": "node_1451",
      "improvement_over_parent": null
    },
    "node_1453": {
      "node_id": "node_1453",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 153.17 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.67e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.16978614405747,
      "fos_buckling": 0.8709126138211856,
      "fos_yielding": 1.0545503294976433,
      "deflection": 0.007672706518933423,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.282)"
      },
      "parent_node_id": "node_1452",
      "improvement_over_parent": null
    },
    "node_1454": {
      "node_id": "node_1454",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 195.38 kg\n  Factor of Safety: 1.08\n  Max Deflection: 6.03e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.38486547608372,
      "fos_buckling": 1.0817871411283968,
      "fos_yielding": 1.3439127360497989,
      "deflection": 0.0060297576255660705,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.292)"
      },
      "parent_node_id": "node_1453",
      "improvement_over_parent": null
    },
    "node_1455": {
      "node_id": "node_1455",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 227.29 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.29311492616745,
      "fos_buckling": 1.232923600111572,
      "fos_yielding": 1.5622614899641052,
      "deflection": 0.005192910269061058,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.175)"
      },
      "parent_node_id": "node_1454",
      "improvement_over_parent": null
    },
    "node_1456": {
      "node_id": "node_1456",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.35 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3467801420425,
      "fos_buckling": 1.523392961860406,
      "fos_yielding": 2.0132706297002576,
      "deflection": 0.0040390591236409805,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.319)"
      },
      "parent_node_id": "node_1455",
      "improvement_over_parent": null
    },
    "node_1457": {
      "node_id": "node_1457",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1456",
      "improvement_over_parent": null
    },
    "node_1458": {
      "node_id": "node_1458",
      "content": "INITIAL DESIGN (Trace 208)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1459": {
      "node_id": "node_1459",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n\nPerformance:\n  Mass: 197.32 kg\n  Factor of Safety: 0.82\n  Max Deflection: 7.64e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.32360617535736,
      "fos_buckling": 0.8179433018995073,
      "fos_yielding": 1.757410933172884,
      "deflection": 0.007643367970324833,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004041)"
      },
      "parent_node_id": "node_1458",
      "improvement_over_parent": null
    },
    "node_1460": {
      "node_id": "node_1460",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 257.01 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.0119367006329,
      "fos_buckling": 1.0219477472376615,
      "fos_yielding": 2.287875324510679,
      "deflection": 0.005881144580123231,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_1459",
      "improvement_over_parent": null
    },
    "node_1461": {
      "node_id": "node_1461",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 287.99 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.99048274970926,
      "fos_buckling": 1.0365663930170628,
      "fos_yielding": 2.2957110557171716,
      "deflection": 0.005879846277145187,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1460",
      "improvement_over_parent": null
    },
    "node_1462": {
      "node_id": "node_1462",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.20431278352333,
      "fos_buckling": 1.5227852553563677,
      "fos_yielding": 2.0122666532073987,
      "deflection": 0.004041011129820236,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_1461",
      "improvement_over_parent": null
    },
    "node_1463": {
      "node_id": "node_1463",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1462",
      "improvement_over_parent": null
    },
    "node_1464": {
      "node_id": "node_1464",
      "content": "INITIAL DESIGN (Trace 209)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1465": {
      "node_id": "node_1465",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 249.87 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.34e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.8655619655146,
      "fos_buckling": 0.8128207274720121,
      "fos_yielding": 2.2649988229857176,
      "deflection": 0.006336775901608119,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1464",
      "improvement_over_parent": null
    },
    "node_1466": {
      "node_id": "node_1466",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 255.08 kg\n  Factor of Safety: 0.81\n  Max Deflection: 5.47e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.0793919993287,
      "fos_buckling": 0.8122397368026681,
      "fos_yielding": 1.9985161036946908,
      "deflection": 0.005474893054756245,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_1465",
      "improvement_over_parent": null
    },
    "node_1467": {
      "node_id": "node_1467",
      "content": "MODIFICATION: Increase 6 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0069)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 263.78 kg\n  Factor of Safety: 0.81\n  Max Deflection: 5.42e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.7770847382819,
      "fos_buckling": 0.8117557684454323,
      "fos_yielding": 1.9805238523647382,
      "deflection": 0.005415278657845099,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.319)"
      },
      "parent_node_id": "node_1466",
      "improvement_over_parent": null
    },
    "node_1468": {
      "node_id": "node_1468",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0069)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 289.67 kg\n  Factor of Safety: 1.14\n  Max Deflection: 4.25e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.6745218806717,
      "fos_buckling": 1.1393529162396558,
      "fos_yielding": 1.8597219350875043,
      "deflection": 0.004254262809149087,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1467",
      "improvement_over_parent": null
    },
    "node_1469": {
      "node_id": "node_1469",
      "content": "MODIFICATION: Increase 4 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0074)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0069)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 294.89 kg\n  Factor of Safety: 1.14\n  Max Deflection: 4.18e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.8886059662357,
      "fos_buckling": 1.140576200654074,
      "fos_yielding": 1.8617186551782836,
      "deflection": 0.004181836002180806,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.613)"
      },
      "parent_node_id": "node_1468",
      "improvement_over_parent": null
    },
    "node_1470": {
      "node_id": "node_1470",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1469",
      "improvement_over_parent": null
    },
    "node_1471": {
      "node_id": "node_1471",
      "content": "INITIAL DESIGN (Trace 210)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 177.30 kg\n  Factor of Safety: 0.99\n  Max Deflection: 6.64e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.30057973157562,
      "fos_buckling": 0.9929788315087196,
      "fos_yielding": 1.2200219155408358,
      "deflection": 0.006637781672099422,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1472": {
      "node_id": "node_1472",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 201.18 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.86e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.17594510739676,
      "fos_buckling": 1.1097434619494813,
      "fos_yielding": 1.383564563617813,
      "deflection": 0.0058581593034621555,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.143)"
      },
      "parent_node_id": "node_1471",
      "improvement_over_parent": null
    },
    "node_1473": {
      "node_id": "node_1473",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 239.13 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.94e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.12845342217972,
      "fos_buckling": 1.2871850768008202,
      "fos_yielding": 1.643171040850954,
      "deflection": 0.004939290198737795,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.203)"
      },
      "parent_node_id": "node_1472",
      "improvement_over_parent": null
    },
    "node_1474": {
      "node_id": "node_1474",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1385582178138,
      "fos_buckling": 1.522524510970546,
      "fos_yielding": 2.011851015614988,
      "deflection": 0.004041879406404175,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.248)"
      },
      "parent_node_id": "node_1473",
      "improvement_over_parent": null
    },
    "node_1475": {
      "node_id": "node_1475",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1474",
      "improvement_over_parent": null
    },
    "node_1476": {
      "node_id": "node_1476",
      "content": "INITIAL DESIGN (Trace 211)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1477": {
      "node_id": "node_1477",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n\nPerformance:\n  Mass: 165.70 kg\n  Factor of Safety: 0.75\n  Max Deflection: 8.40e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.69838081827163,
      "fos_buckling": 0.74998852700942,
      "fos_yielding": 1.6075189363203168,
      "deflection": 0.00839728924686041,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003421)"
      },
      "parent_node_id": "node_1476",
      "improvement_over_parent": null
    },
    "node_1478": {
      "node_id": "node_1478",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n\nPerformance:\n  Mass: 188.81 kg\n  Factor of Safety: 0.80\n  Max Deflection: 6.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.81019504608463,
      "fos_buckling": 0.7975599553876674,
      "fos_yielding": 1.6075189363203164,
      "deflection": 0.006875203807668242,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003674)"
      },
      "parent_node_id": "node_1477",
      "improvement_over_parent": null
    },
    "node_1479": {
      "node_id": "node_1479",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 224.88 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.79e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.87588061393546,
      "fos_buckling": 0.9258985379714539,
      "fos_yielding": 1.9139258715867296,
      "deflection": 0.0057856482606544555,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.206)"
      },
      "parent_node_id": "node_1478",
      "improvement_over_parent": null
    },
    "node_1480": {
      "node_id": "node_1480",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 245.28 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.82e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.28238789101988,
      "fos_buckling": 1.3150627798643615,
      "fos_yielding": 1.6851463261831128,
      "deflection": 0.004817144260281148,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004006)"
      },
      "parent_node_id": "node_1479",
      "improvement_over_parent": null
    },
    "node_1481": {
      "node_id": "node_1481",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.08 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0790151803542,
      "fos_buckling": 1.5223311158455377,
      "fos_yielding": 2.0113536480603043,
      "deflection": 0.004042732290447413,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.214)"
      },
      "parent_node_id": "node_1480",
      "improvement_over_parent": null
    },
    "node_1482": {
      "node_id": "node_1482",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1481",
      "improvement_over_parent": null
    },
    "node_1483": {
      "node_id": "node_1483",
      "content": "INITIAL DESIGN (Trace 212)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 104.43 kg\n  Factor of Safety: 0.38\n  Max Deflection: 2.00e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 104.42678120570054,
      "fos_buckling": 0.37501788788545004,
      "fos_yielding": 0.9282325380700555,
      "deflection": 20020310323648.086,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1484": {
      "node_id": "node_1484",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 124.78 kg\n  Factor of Safety: 0.24\n  Max Deflection: 6.15e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 124.78238594244904,
      "fos_buckling": 0.23522832055074522,
      "fos_yielding": 0.7968372291241309,
      "deflection": 61487499082611.2,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.205)"
      },
      "parent_node_id": "node_1483",
      "improvement_over_parent": null
    },
    "node_1485": {
      "node_id": "node_1485",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 158.08 kg\n  Factor of Safety: 0.26\n  Max Deflection: 3.04e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 158.080984399513,
      "fos_buckling": 0.2626930033086679,
      "fos_yielding": 0.9648962343203118,
      "deflection": 30444650804330.977,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.285)"
      },
      "parent_node_id": "node_1484",
      "improvement_over_parent": null
    },
    "node_1486": {
      "node_id": "node_1486",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 180.47 kg\n  Factor of Safety: 0.15\n  Max Deflection: 4.57e+13 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.4663132302357,
      "fos_buckling": 0.14721474846699842,
      "fos_yielding": 0.7654923338336598,
      "deflection": 45663195985594.805,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.153)"
      },
      "parent_node_id": "node_1485",
      "improvement_over_parent": null
    },
    "node_1487": {
      "node_id": "node_1487",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 184.91 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.95e+13 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.9066084123387,
      "fos_buckling": 0.8529621304348328,
      "fos_yielding": 2.9290126418182796,
      "deflection": 79523784787722.55,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002775)"
      },
      "parent_node_id": "node_1486",
      "improvement_over_parent": null
    },
    "node_1488": {
      "node_id": "node_1488",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 217.23 kg\n  Factor of Safety: 0.12\n  Max Deflection: 5.38e+13 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.2259518595198,
      "fos_buckling": 0.11977055399058174,
      "fos_yielding": 0.28132684281909387,
      "deflection": 53827041685437.76,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_1487",
      "improvement_over_parent": null
    },
    "node_1489": {
      "node_id": "node_1489",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 260.42 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.42400979697203,
      "fos_buckling": 1.0071789575149106,
      "fos_yielding": 1.9996298197036628,
      "deflection": 0.005005347852895221,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1488",
      "improvement_over_parent": null
    },
    "node_1490": {
      "node_id": "node_1490",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.34 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.33654642858903,
      "fos_buckling": 1.5234826712298406,
      "fos_yielding": 2.0134275539479316,
      "deflection": 0.004039163119300899,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1489",
      "improvement_over_parent": null
    },
    "node_1491": {
      "node_id": "node_1491",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1490",
      "improvement_over_parent": null
    },
    "node_1492": {
      "node_id": "node_1492",
      "content": "INITIAL DESIGN (Trace 213)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 174.13 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.80e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.12729523855452,
      "fos_buckling": 0.8834096273574782,
      "fos_yielding": 1.2295086739593348,
      "deflection": 0.006801911588688146,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1493": {
      "node_id": "node_1493",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 201.34 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.89e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.3391223201703,
      "fos_buckling": 1.0073247031682162,
      "fos_yielding": 1.4204767963543616,
      "deflection": 0.005891440190171391,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.166)"
      },
      "parent_node_id": "node_1492",
      "improvement_over_parent": null
    },
    "node_1494": {
      "node_id": "node_1494",
      "content": "MODIFICATION: Increase 7 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 206.43 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.71e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.431710487221,
      "fos_buckling": 1.1349444308898056,
      "fos_yielding": 1.41959111794091,
      "deflection": 0.005710781003847274,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.214)"
      },
      "parent_node_id": "node_1493",
      "improvement_over_parent": null
    },
    "node_1495": {
      "node_id": "node_1495",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 235.43 kg\n  Factor of Safety: 1.27\n  Max Deflection: 5.02e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.4330025163156,
      "fos_buckling": 1.2703804427646967,
      "fos_yielding": 1.6179678581465546,
      "deflection": 0.005015763035757473,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.151)"
      },
      "parent_node_id": "node_1494",
      "improvement_over_parent": null
    },
    "node_1496": {
      "node_id": "node_1496",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.54 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.5382679042512,
      "fos_buckling": 1.5242288472581969,
      "fos_yielding": 2.0146433839226114,
      "deflection": 0.004036485327170116,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.271)"
      },
      "parent_node_id": "node_1495",
      "improvement_over_parent": null
    },
    "node_1497": {
      "node_id": "node_1497",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1496",
      "improvement_over_parent": null
    },
    "node_1498": {
      "node_id": "node_1498",
      "content": "INITIAL DESIGN (Trace 214)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 273.20 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.34e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 273.20307043699836,
      "fos_buckling": 1.4200844893818716,
      "fos_yielding": 1.9848097588758467,
      "deflection": 0.004337575457805819,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1499": {
      "node_id": "node_1499",
      "content": "MODIFICATION: Increase 8 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 278.58 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.27e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 278.5803274077732,
      "fos_buckling": 1.4711654641460254,
      "fos_yielding": 1.98566321797259,
      "deflection": 0.0042682785815625545,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.280)"
      },
      "parent_node_id": "node_1498",
      "improvement_over_parent": null
    },
    "node_1500": {
      "node_id": "node_1500",
      "content": "MODIFICATION: Increase 1 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 286.28 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.28057171023295,
      "fos_buckling": 1.474113596732671,
      "fos_yielding": 2.011561368070039,
      "deflection": 0.004106472323958898,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.309)"
      },
      "parent_node_id": "node_1499",
      "improvement_over_parent": null
    },
    "node_1501": {
      "node_id": "node_1501",
      "content": "MODIFICATION: Increase 8 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1914745661871,
      "fos_buckling": 1.5230082791375683,
      "fos_yielding": 2.012397152372261,
      "deflection": 0.004041114306876371,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.292)"
      },
      "parent_node_id": "node_1500",
      "improvement_over_parent": null
    },
    "node_1502": {
      "node_id": "node_1502",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1501",
      "improvement_over_parent": null
    },
    "node_1503": {
      "node_id": "node_1503",
      "content": "INITIAL DESIGN (Trace 215)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0021)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 166.89 kg\n  Factor of Safety: 0.39\n  Max Deflection: 2.96e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.8927169925853,
      "fos_buckling": 0.39330236155211107,
      "fos_yielding": 1.2163205562270685,
      "deflection": 0.029614527440998614,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1504": {
      "node_id": "node_1504",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 209.63 kg\n  Factor of Safety: 0.48\n  Max Deflection: 2.36e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.62562499806606,
      "fos_buckling": 0.4787884527604715,
      "fos_yielding": 1.5381875878324716,
      "deflection": 0.023589365035950827,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.277)"
      },
      "parent_node_id": "node_1503",
      "improvement_over_parent": null
    },
    "node_1505": {
      "node_id": "node_1505",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 214.25 kg\n  Factor of Safety: 0.53\n  Max Deflection: 8.18e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.25462111790526,
      "fos_buckling": 0.5342545838425363,
      "fos_yielding": 1.690472089263319,
      "deflection": 0.008175279996999647,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002903)"
      },
      "parent_node_id": "node_1504",
      "improvement_over_parent": null
    },
    "node_1506": {
      "node_id": "node_1506",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 241.43 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.27e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.4262348777522,
      "fos_buckling": 0.5888434288270473,
      "fos_yielding": 1.9014901587110926,
      "deflection": 0.0072678049425905665,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.139)"
      },
      "parent_node_id": "node_1505",
      "improvement_over_parent": null
    },
    "node_1507": {
      "node_id": "node_1507",
      "content": "MODIFICATION: Increase 3 thickness by 60%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 250.08 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.08108811066123,
      "fos_buckling": 0.5884939095247032,
      "fos_yielding": 1.9008894500551468,
      "deflection": 0.007192771333409243,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.603)"
      },
      "parent_node_id": "node_1506",
      "improvement_over_parent": null
    },
    "node_1508": {
      "node_id": "node_1508",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.28 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.27914604811343,
      "fos_buckling": 1.5231404946931322,
      "fos_yielding": 2.012812406286189,
      "deflection": 0.004040024635877237,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1507",
      "improvement_over_parent": null
    },
    "node_1509": {
      "node_id": "node_1509",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1508",
      "improvement_over_parent": null
    },
    "node_1510": {
      "node_id": "node_1510",
      "content": "INITIAL DESIGN (Trace 216)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 175.56 kg\n  Factor of Safety: 0.96\n  Max Deflection: 1.83e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.559612067303,
      "fos_buckling": 0.9592192499516959,
      "fos_yielding": 2.288071782940979,
      "deflection": 18329102986606.477,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1511": {
      "node_id": "node_1511",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 206.54 kg\n  Factor of Safety: 0.24\n  Max Deflection: 2.92e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.53815811637935,
      "fos_buckling": 0.23955304206947195,
      "fos_yielding": 0.5626536856381877,
      "deflection": 29153110354616.125,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1510",
      "improvement_over_parent": null
    },
    "node_1512": {
      "node_id": "node_1512",
      "content": "MODIFICATION: Increase 0 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 212.21 kg\n  Factor of Safety: 1.92\n  Max Deflection: 1.26e+13 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 212.21044798556912,
      "fos_buckling": 1.9162102664778955,
      "fos_yielding": 2.354430889697476,
      "deflection": 12551583902340.42,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.220)"
      },
      "parent_node_id": "node_1511",
      "improvement_over_parent": null
    },
    "node_1513": {
      "node_id": "node_1513",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n\nPerformance:\n  Mass: 245.20 kg\n  Factor of Safety: 0.80\n  Max Deflection: 5.59e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.2032349488498,
      "fos_buckling": 0.8028488863021899,
      "fos_yielding": 1.9841319954379482,
      "deflection": 0.005592427231175358,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004604)"
      },
      "parent_node_id": "node_1512",
      "improvement_over_parent": null
    },
    "node_1514": {
      "node_id": "node_1514",
      "content": "MODIFICATION: Increase 7 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0084)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n\nPerformance:\n  Mass: 258.48 kg\n  Factor of Safety: 0.80\n  Max Deflection: 5.45e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.4762998746984,
      "fos_buckling": 0.8021184765066046,
      "fos_yielding": 2.0086837955008905,
      "deflection": 0.005445464991828268,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.339)"
      },
      "parent_node_id": "node_1513",
      "improvement_over_parent": null
    },
    "node_1515": {
      "node_id": "node_1515",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0084)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 291.39 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.17e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.3888365063154,
      "fos_buckling": 1.2959174719627662,
      "fos_yielding": 2.0247214126457505,
      "deflection": 0.004170009194421594,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1514",
      "improvement_over_parent": null
    },
    "node_1516": {
      "node_id": "node_1516",
      "content": "MODIFICATION: Increase 1 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0084)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 296.30 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 296.30223588615326,
      "fos_buckling": 1.297863722424046,
      "fos_yielding": 2.042215821605497,
      "deflection": 0.004063872305162459,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.179)"
      },
      "parent_node_id": "node_1515",
      "improvement_over_parent": null
    },
    "node_1517": {
      "node_id": "node_1517",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1516",
      "improvement_over_parent": null
    },
    "node_1518": {
      "node_id": "node_1518",
      "content": "INITIAL DESIGN (Trace 217)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 162.14 kg\n  Factor of Safety: 0.98\n  Max Deflection: 8.01e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.13741128538896,
      "fos_buckling": 0.9780298548691045,
      "fos_yielding": 1.6535764607045207,
      "deflection": 8007768313474.33,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1519": {
      "node_id": "node_1519",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 201.60 kg\n  Factor of Safety: 0.91\n  Max Deflection: 7.08e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.60400305860165,
      "fos_buckling": 0.9136635234470681,
      "fos_yielding": 2.026341419436148,
      "deflection": 0.007079840178509277,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005484)"
      },
      "parent_node_id": "node_1518",
      "improvement_over_parent": null
    },
    "node_1520": {
      "node_id": "node_1520",
      "content": "MODIFICATION: Increase 0 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 207.71 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.68e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.71286162809372,
      "fos_buckling": 0.9132796560410146,
      "fos_yielding": 2.026341419436148,
      "deflection": 0.006684362667037132,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.276)"
      },
      "parent_node_id": "node_1519",
      "improvement_over_parent": null
    },
    "node_1521": {
      "node_id": "node_1521",
      "content": "MODIFICATION: Increase 7 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 215.09 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.69e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.09472769644634,
      "fos_buckling": 0.9128162257752558,
      "fos_yielding": 2.025411971104612,
      "deflection": 0.006688700223089883,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.399)"
      },
      "parent_node_id": "node_1520",
      "improvement_over_parent": null
    },
    "node_1522": {
      "node_id": "node_1522",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 243.09 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.93e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.0865614262579,
      "fos_buckling": 1.0087633047737725,
      "fos_yielding": 2.2883247389509704,
      "deflection": 0.0059311147629122355,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.143)"
      },
      "parent_node_id": "node_1521",
      "improvement_over_parent": null
    },
    "node_1523": {
      "node_id": "node_1523",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 268.98 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.9839985686477,
      "fos_buckling": 1.0725251847143826,
      "fos_yielding": 2.28832473895097,
      "deflection": 0.004850237258032919,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1522",
      "improvement_over_parent": null
    },
    "node_1524": {
      "node_id": "node_1524",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.37 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3654705294798,
      "fos_buckling": 1.5234015356718444,
      "fos_yielding": 2.0135173176827292,
      "deflection": 0.004038593761947845,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1523",
      "improvement_over_parent": null
    },
    "node_1525": {
      "node_id": "node_1525",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1524",
      "improvement_over_parent": null
    },
    "node_1526": {
      "node_id": "node_1526",
      "content": "INITIAL DESIGN (Trace 218)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 254.79 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.25e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.79089902226602,
      "fos_buckling": 1.007882807409946,
      "fos_yielding": 2.2660198281704313,
      "deflection": 0.0062540650630939,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1527": {
      "node_id": "node_1527",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 258.82 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.40e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.82248000640004,
      "fos_buckling": 1.0073257475303898,
      "fos_yielding": 2.0022246578053102,
      "deflection": 0.005401810698326668,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002501)"
      },
      "parent_node_id": "node_1526",
      "improvement_over_parent": null
    },
    "node_1528": {
      "node_id": "node_1528",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 284.72 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.25e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 284.7199171487898,
      "fos_buckling": 1.4294417506029218,
      "fos_yielding": 2.021687852648076,
      "deflection": 0.004247997787261698,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1527",
      "improvement_over_parent": null
    },
    "node_1529": {
      "node_id": "node_1529",
      "content": "MODIFICATION: Increase 0 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 292.05 kg\n  Factor of Safety: 1.50\n  Max Deflection: 4.09e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.0538653933277,
      "fos_buckling": 1.5001060721783643,
      "fos_yielding": 2.0197543999631478,
      "deflection": 0.004093614319467668,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.302)"
      },
      "parent_node_id": "node_1528",
      "improvement_over_parent": null
    },
    "node_1530": {
      "node_id": "node_1530",
      "content": "MODIFICATION: Increase 5 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0082)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 304.33 kg\n  Factor of Safety: 1.51\n  Max Deflection: 3.94e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 304.3280459097344,
      "fos_buckling": 1.507352197666137,
      "fos_yielding": 2.017734353399353,
      "deflection": 0.003936623695185942,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.323)"
      },
      "parent_node_id": "node_1529",
      "improvement_over_parent": null
    },
    "node_1531": {
      "node_id": "node_1531",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1530",
      "improvement_over_parent": null
    },
    "node_1532": {
      "node_id": "node_1532",
      "content": "INITIAL DESIGN (Trace 219)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 136.48 kg\n  Factor of Safety: 0.66\n  Max Deflection: 1.07e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 136.4754316758374,
      "fos_buckling": 0.6597337203065216,
      "fos_yielding": 1.3889360502024084,
      "deflection": 0.010705165067215394,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1533": {
      "node_id": "node_1533",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 159.10 kg\n  Factor of Safety: 0.75\n  Max Deflection: 9.19e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.1004729680908,
      "fos_buckling": 0.754744910146431,
      "fos_yielding": 1.618253289219429,
      "deflection": 0.009192559823903672,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.176)"
      },
      "parent_node_id": "node_1532",
      "improvement_over_parent": null
    },
    "node_1534": {
      "node_id": "node_1534",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 194.66 kg\n  Factor of Safety: 0.90\n  Max Deflection: 7.53e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.65664222050893,
      "fos_buckling": 0.8959337470350079,
      "fos_yielding": 1.978045982420406,
      "deflection": 0.007525657796366792,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.241)"
      },
      "parent_node_id": "node_1533",
      "improvement_over_parent": null
    },
    "node_1535": {
      "node_id": "node_1535",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 225.24 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.51e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.24454269419934,
      "fos_buckling": 1.009505377575008,
      "fos_yielding": 2.2869626683233677,
      "deflection": 0.006512509900659924,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.172)"
      },
      "parent_node_id": "node_1534",
      "improvement_over_parent": null
    },
    "node_1536": {
      "node_id": "node_1536",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 249.63 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.24e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.62601465503144,
      "fos_buckling": 1.0078172952387883,
      "fos_yielding": 1.9611058619587218,
      "deflection": 0.0052383782341679595,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1535",
      "improvement_over_parent": null
    },
    "node_1537": {
      "node_id": "node_1537",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 282.54 kg\n  Factor of Safety: 1.50\n  Max Deflection: 4.29e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.53855128664844,
      "fos_buckling": 1.4995908539231608,
      "fos_yielding": 1.9731940043433198,
      "deflection": 0.004287272110604764,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1536",
      "improvement_over_parent": null
    },
    "node_1538": {
      "node_id": "node_1538",
      "content": "MODIFICATION: Increase 1 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1924510337778,
      "fos_buckling": 1.522928152463679,
      "fos_yielding": 2.0122412886017225,
      "deflection": 0.0040412466472818185,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.479)"
      },
      "parent_node_id": "node_1537",
      "improvement_over_parent": null
    },
    "node_1539": {
      "node_id": "node_1539",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1538",
      "improvement_over_parent": null
    },
    "node_1540": {
      "node_id": "node_1540",
      "content": "INITIAL DESIGN (Trace 220)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0015)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0011)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0014)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 132.01 kg\n  Factor of Safety: 0.61\n  Max Deflection: 9.01e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 132.01005450718114,
      "fos_buckling": 0.6128248961710012,
      "fos_yielding": 0.6715151886525556,
      "deflection": 0.009013858887456429,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1541": {
      "node_id": "node_1541",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0018)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0017)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 155.35 kg\n  Factor of Safety: 0.72\n  Max Deflection: 7.67e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.34575015652584,
      "fos_buckling": 0.7153765272731234,
      "fos_yielding": 0.7913540094243416,
      "deflection": 0.007668830526027569,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.185)"
      },
      "parent_node_id": "node_1540",
      "improvement_over_parent": null
    },
    "node_1542": {
      "node_id": "node_1542",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0022)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 188.67 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.32e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.67141907384004,
      "fos_buckling": 0.8587968623762104,
      "fos_yielding": 0.9631802334178263,
      "deflection": 0.006324820419701662,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.227)"
      },
      "parent_node_id": "node_1541",
      "improvement_over_parent": null
    },
    "node_1543": {
      "node_id": "node_1543",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 241.53 kg\n  Factor of Safety: 1.08\n  Max Deflection: 4.95e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.53159107169972,
      "fos_buckling": 1.0789291139281296,
      "fos_yielding": 1.237536112165675,
      "deflection": 0.004953617698000406,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.302)"
      },
      "parent_node_id": "node_1542",
      "improvement_over_parent": null
    },
    "node_1544": {
      "node_id": "node_1544",
      "content": "MODIFICATION: Increase 2 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 248.62 kg\n  Factor of Safety: 1.08\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.61958106670141,
      "fos_buckling": 1.079868987552464,
      "fos_yielding": 1.238614151061809,
      "deflection": 0.004849098685403963,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.504)"
      },
      "parent_node_id": "node_1543",
      "improvement_over_parent": null
    },
    "node_1545": {
      "node_id": "node_1545",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.51 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.19e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.50573356002405,
      "fos_buckling": 1.2359114652233258,
      "fos_yielding": 1.441891685915644,
      "deflection": 0.004186738870097144,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.176)"
      },
      "parent_node_id": "node_1544",
      "improvement_over_parent": null
    },
    "node_1546": {
      "node_id": "node_1546",
      "content": "MODIFICATION: Increase 6 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 291.43 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.4280405220203,
      "fos_buckling": 1.4518595889235042,
      "fos_yielding": 2.017797998236448,
      "deflection": 0.004109785086059093,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.456)"
      },
      "parent_node_id": "node_1545",
      "improvement_over_parent": null
    },
    "node_1547": {
      "node_id": "node_1547",
      "content": "MODIFICATION: Increase 5 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.77 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.05e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.7749694182982,
      "fos_buckling": 1.5210293646020017,
      "fos_yielding": 2.009148077427135,
      "deflection": 0.0040467980672748965,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.383)"
      },
      "parent_node_id": "node_1546",
      "improvement_over_parent": null
    },
    "node_1548": {
      "node_id": "node_1548",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1547",
      "improvement_over_parent": null
    },
    "node_1549": {
      "node_id": "node_1549",
      "content": "INITIAL DESIGN (Trace 221)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 170.84 kg\n  Factor of Safety: 0.67\n  Max Deflection: 1.03e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.8430861164288,
      "fos_buckling": 0.6737128011738177,
      "fos_yielding": 1.180122500866635,
      "deflection": 0.010280182625052795,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1550": {
      "node_id": "node_1550",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 207.22 kg\n  Factor of Safety: 0.80\n  Max Deflection: 8.48e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.2208980438889,
      "fos_buckling": 0.798179169146095,
      "fos_yielding": 1.4325120528697501,
      "deflection": 0.00848138981654564,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.227)"
      },
      "parent_node_id": "node_1549",
      "improvement_over_parent": null
    },
    "node_1551": {
      "node_id": "node_1551",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n\nPerformance:\n  Mass: 211.12 kg\n  Factor of Safety: 1.08\n  Max Deflection: 5.70e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.1213429371112,
      "fos_buckling": 1.080649287143739,
      "fos_yielding": 1.2407460468295346,
      "deflection": 0.005701800472550626,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002414)"
      },
      "parent_node_id": "node_1550",
      "improvement_over_parent": null
    },
    "node_1552": {
      "node_id": "node_1552",
      "content": "MODIFICATION: Increase 0 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n\nPerformance:\n  Mass: 218.07 kg\n  Factor of Safety: 1.08\n  Max Deflection: 5.43e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.06535641823223,
      "fos_buckling": 1.0795820617373768,
      "fos_yielding": 1.239520713393634,
      "deflection": 0.005434416807168979,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.401)"
      },
      "parent_node_id": "node_1551",
      "improvement_over_parent": null
    },
    "node_1553": {
      "node_id": "node_1553",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 241.74 kg\n  Factor of Safety: 1.18\n  Max Deflection: 4.91e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.7423317620368,
      "fos_buckling": 1.1843141543894795,
      "fos_yielding": 1.3753811058916416,
      "deflection": 0.004908669511974327,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.117)"
      },
      "parent_node_id": "node_1552",
      "improvement_over_parent": null
    },
    "node_1554": {
      "node_id": "node_1554",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 291.30 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.30134999552763,
      "fos_buckling": 1.3955379483234174,
      "fos_yielding": 1.6608170281620411,
      "deflection": 0.0040848593046305115,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.225)"
      },
      "parent_node_id": "node_1553",
      "improvement_over_parent": null
    },
    "node_1555": {
      "node_id": "node_1555",
      "content": "MODIFICATION: Increase 6 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0076)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 300.53 kg\n  Factor of Safety: 1.39\n  Max Deflection: 3.96e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 300.5331727922327,
      "fos_buckling": 1.3946513962354825,
      "fos_yielding": 1.6597619505801209,
      "deflection": 0.00396479946659485,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.241)"
      },
      "parent_node_id": "node_1554",
      "improvement_over_parent": null
    },
    "node_1556": {
      "node_id": "node_1556",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1555",
      "improvement_over_parent": null
    },
    "node_1557": {
      "node_id": "node_1557",
      "content": "INITIAL DESIGN (Trace 222)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 159.33 kg\n  Factor of Safety: 0.37\n  Max Deflection: 1.16e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.3316681617814,
      "fos_buckling": 0.3721334135149145,
      "fos_yielding": 1.0556002155042103,
      "deflection": 0.011579609148471564,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1558": {
      "node_id": "node_1558",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 189.17 kg\n  Factor of Safety: 1.07\n  Max Deflection: 6.36e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.1748992555715,
      "fos_buckling": 1.070568538309857,
      "fos_yielding": 1.3516396169706781,
      "deflection": 0.006360054049743387,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004064)"
      },
      "parent_node_id": "node_1557",
      "improvement_over_parent": null
    },
    "node_1559": {
      "node_id": "node_1559",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 210.64 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.72e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.63959986460122,
      "fos_buckling": 1.1755774809705068,
      "fos_yielding": 1.5039608450860018,
      "deflection": 0.005717987985776625,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.121)"
      },
      "parent_node_id": "node_1558",
      "improvement_over_parent": null
    },
    "node_1560": {
      "node_id": "node_1560",
      "content": "MODIFICATION: Increase 0 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 218.50 kg\n  Factor of Safety: 1.19\n  Max Deflection: 5.40e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.50246485740428,
      "fos_buckling": 1.1920587180398214,
      "fos_yielding": 1.5022056916797435,
      "deflection": 0.0053991227463523455,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.481)"
      },
      "parent_node_id": "node_1559",
      "improvement_over_parent": null
    },
    "node_1561": {
      "node_id": "node_1561",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 265.36 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.46e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.36447009383375,
      "fos_buckling": 1.4040865932994366,
      "fos_yielding": 1.8224539680961036,
      "deflection": 0.004457781732823028,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.233)"
      },
      "parent_node_id": "node_1560",
      "improvement_over_parent": null
    },
    "node_1562": {
      "node_id": "node_1562",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.13390093258334,
      "fos_buckling": 1.522578858936907,
      "fos_yielding": 2.011907020012843,
      "deflection": 0.00404198276189587,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.115)"
      },
      "parent_node_id": "node_1561",
      "improvement_over_parent": null
    },
    "node_1563": {
      "node_id": "node_1563",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1562",
      "improvement_over_parent": null
    },
    "node_1564": {
      "node_id": "node_1564",
      "content": "INITIAL DESIGN (Trace 223)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 162.50 kg\n  Factor of Safety: 0.68\n  Max Deflection: 8.17e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.49796727770396,
      "fos_buckling": 0.680992741530314,
      "fos_yielding": 1.2445778849653364,
      "deflection": 0.008165880099191728,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1565": {
      "node_id": "node_1565",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 208.57 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.38e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.5652762356541,
      "fos_buckling": 0.8447365479566145,
      "fos_yielding": 1.5951134698811742,
      "deflection": 0.006380013293194663,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_1564",
      "improvement_over_parent": null
    },
    "node_1566": {
      "node_id": "node_1566",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n\nPerformance:\n  Mass: 229.48 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.20e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.47608417476394,
      "fos_buckling": 1.0989602835168997,
      "fos_yielding": 1.6056082840929833,
      "deflection": 0.005198394948148854,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003972)"
      },
      "parent_node_id": "node_1565",
      "improvement_over_parent": null
    },
    "node_1567": {
      "node_id": "node_1567",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n\nPerformance:\n  Mass: 256.78 kg\n  Factor of Safety: 1.21\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.7815337362245,
      "fos_buckling": 1.213296060081482,
      "fos_yielding": 1.7952802436716795,
      "deflection": 0.004652302024597636,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.129)"
      },
      "parent_node_id": "node_1566",
      "improvement_over_parent": null
    },
    "node_1568": {
      "node_id": "node_1568",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 284.20 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.21e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 284.19774556851576,
      "fos_buckling": 1.3245778854807002,
      "fos_yielding": 1.985418434720393,
      "deflection": 0.0042095498252334934,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.117)"
      },
      "parent_node_id": "node_1567",
      "improvement_over_parent": null
    },
    "node_1569": {
      "node_id": "node_1569",
      "content": "MODIFICATION: Increase 10 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0064)]\n\nPerformance:\n  Mass: 290.58 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.5801791493389,
      "fos_buckling": 1.322350043824501,
      "fos_yielding": 1.98595800474678,
      "deflection": 0.004163459832479555,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.279)"
      },
      "parent_node_id": "node_1568",
      "improvement_over_parent": null
    },
    "node_1570": {
      "node_id": "node_1570",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1569",
      "improvement_over_parent": null
    },
    "node_1571": {
      "node_id": "node_1571",
      "content": "INITIAL DESIGN (Trace 224)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 178.07 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.06899216700432,
      "fos_buckling": 0.44288864379296294,
      "fos_yielding": 1.3588266478640412,
      "deflection": 0.010059377924402578,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1572": {
      "node_id": "node_1572",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 203.06 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.83e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.06103523391977,
      "fos_buckling": 0.49558074132716934,
      "fos_yielding": 1.5474416163396498,
      "deflection": 0.008834072182984782,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.151)"
      },
      "parent_node_id": "node_1571",
      "improvement_over_parent": null
    },
    "node_1573": {
      "node_id": "node_1573",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 250.22 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.21559050191522,
      "fos_buckling": 0.5887563906697884,
      "fos_yielding": 1.901930449171303,
      "deflection": 0.007188790375864644,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.255)"
      },
      "parent_node_id": "node_1572",
      "improvement_over_parent": null
    },
    "node_1574": {
      "node_id": "node_1574",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.41 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4136484393674,
      "fos_buckling": 1.5237884139209392,
      "fos_yielding": 2.0139356531161208,
      "deflection": 0.0040382051334399635,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1573",
      "improvement_over_parent": null
    },
    "node_1575": {
      "node_id": "node_1575",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1574",
      "improvement_over_parent": null
    },
    "node_1576": {
      "node_id": "node_1576",
      "content": "INITIAL DESIGN (Trace 225)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 213.87 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.84e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.8729515384188,
      "fos_buckling": 0.9118853752514358,
      "fos_yielding": 1.8119812510673563,
      "deflection": 0.005837333681272769,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1577": {
      "node_id": "node_1577",
      "content": "MODIFICATION: Increase 3 thickness by 60%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 221.58 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.73e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.58446908395337,
      "fos_buckling": 0.9114022819819089,
      "fos_yielding": 1.7872146763381016,
      "deflection": 0.005731800380649955,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.603)"
      },
      "parent_node_id": "node_1576",
      "improvement_over_parent": null
    },
    "node_1578": {
      "node_id": "node_1578",
      "content": "MODIFICATION: Increase 4 thickness by 65%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 223.92 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.73e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.91690153858303,
      "fos_buckling": 0.9114022819819089,
      "fos_yielding": 1.7872146763381016,
      "deflection": 0.005731800380649955,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.647)"
      },
      "parent_node_id": "node_1577",
      "improvement_over_parent": null
    },
    "node_1579": {
      "node_id": "node_1579",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n\nPerformance:\n  Mass: 253.02 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.63e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.01914558259517,
      "fos_buckling": 1.3329628590991514,
      "fos_yielding": 1.7987748564044233,
      "deflection": 0.004632487380682562,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004706)"
      },
      "parent_node_id": "node_1578",
      "improvement_over_parent": null
    },
    "node_1580": {
      "node_id": "node_1580",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 286.25 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.24888304421813,
      "fos_buckling": 1.4745354810335447,
      "fos_yielding": 2.03286606452525,
      "deflection": 0.004102920981053159,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_1579",
      "improvement_over_parent": null
    },
    "node_1581": {
      "node_id": "node_1581",
      "content": "MODIFICATION: Increase 9 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0083)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 298.92 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.93e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 298.9186963457811,
      "fos_buckling": 1.53255437575499,
      "fos_yielding": 2.058649792849279,
      "deflection": 0.003929520271526152,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.323)"
      },
      "parent_node_id": "node_1580",
      "improvement_over_parent": null
    },
    "node_1582": {
      "node_id": "node_1582",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1581",
      "improvement_over_parent": null
    },
    "node_1583": {
      "node_id": "node_1583",
      "content": "INITIAL DESIGN (Trace 226)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 233.83 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.44e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.8274961717877,
      "fos_buckling": 0.9838775489891821,
      "fos_yielding": 2.058055226529948,
      "deflection": 0.0054366987910409266,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1584": {
      "node_id": "node_1584",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.23 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.89e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.2308772197228,
      "fos_buckling": 1.0733509960264058,
      "fos_yielding": 2.28976821821773,
      "deflection": 0.004893059724520742,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.124)"
      },
      "parent_node_id": "node_1583",
      "improvement_over_parent": null
    },
    "node_1585": {
      "node_id": "node_1585",
      "content": "MODIFICATION: Increase 4 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 261.61 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 261.6064846406377,
      "fos_buckling": 1.0733509960264058,
      "fos_yielding": 2.28976821821773,
      "deflection": 0.0048578217363141,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.266)"
      },
      "parent_node_id": "node_1584",
      "improvement_over_parent": null
    },
    "node_1586": {
      "node_id": "node_1586",
      "content": "MODIFICATION: Increase 5 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.44 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.4406035586992,
      "fos_buckling": 1.0732282962967656,
      "fos_yielding": 2.28976821821773,
      "deflection": 0.004847828225643894,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.209)"
      },
      "parent_node_id": "node_1585",
      "improvement_over_parent": null
    },
    "node_1587": {
      "node_id": "node_1587",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.42 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4191496077756,
      "fos_buckling": 1.5236412210503103,
      "fos_yielding": 2.0139871295699647,
      "deflection": 0.004037928289433606,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1586",
      "improvement_over_parent": null
    },
    "node_1588": {
      "node_id": "node_1588",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1587",
      "improvement_over_parent": null
    },
    "node_1589": {
      "node_id": "node_1589",
      "content": "INITIAL DESIGN (Trace 227)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 206.52 kg\n  Factor of Safety: 0.70\n  Max Deflection: 8.25e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.5191239518641,
      "fos_buckling": 0.6972253263370077,
      "fos_yielding": 1.9457034767707515,
      "deflection": 8246920789681.144,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1590": {
      "node_id": "node_1590",
      "content": "MODIFICATION: Increase 6 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 211.09 kg\n  Factor of Safety: 0.67\n  Max Deflection: 2.83e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.0876724775236,
      "fos_buckling": 0.6734258373156389,
      "fos_yielding": 1.9096557367085798,
      "deflection": 28298295846160.574,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.190)"
      },
      "parent_node_id": "node_1589",
      "improvement_over_parent": null
    },
    "node_1591": {
      "node_id": "node_1591",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 216.30 kg\n  Factor of Safety: 0.76\n  Max Deflection: 1.76e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.3015025113377,
      "fos_buckling": 0.7599196158529218,
      "fos_yielding": 3.595386231725728,
      "deflection": 17606529403474.633,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_1590",
      "improvement_over_parent": null
    },
    "node_1592": {
      "node_id": "node_1592",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n\nPerformance:\n  Mass: 251.44 kg\n  Factor of Safety: 0.85\n  Max Deflection: 5.79e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.43798346952485,
      "fos_buckling": 0.8473122284587119,
      "fos_yielding": 1.9986878758131656,
      "deflection": 0.00579101756488282,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004926)"
      },
      "parent_node_id": "node_1591",
      "improvement_over_parent": null
    },
    "node_1593": {
      "node_id": "node_1593",
      "content": "MODIFICATION: Increase 6 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0065)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n\nPerformance:\n  Mass: 258.36 kg\n  Factor of Safety: 0.85\n  Max Deflection: 5.74e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.35642665737055,
      "fos_buckling": 0.8469104219262235,
      "fos_yielding": 1.9838902069572537,
      "deflection": 0.005742040050140848,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.252)"
      },
      "parent_node_id": "node_1592",
      "improvement_over_parent": null
    },
    "node_1594": {
      "node_id": "node_1594",
      "content": "MODIFICATION: Increase 0 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0065)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n\nPerformance:\n  Mass: 266.17 kg\n  Factor of Safety: 0.85\n  Max Deflection: 5.33e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 266.17189755428797,
      "fos_buckling": 0.8464569763400394,
      "fos_yielding": 1.9836767225413479,
      "deflection": 0.005327992624564055,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.328)"
      },
      "parent_node_id": "node_1593",
      "improvement_over_parent": null
    },
    "node_1595": {
      "node_id": "node_1595",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0065)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 292.07 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.06933469667774,
      "fos_buckling": 1.3435899407881318,
      "fos_yielding": 1.9997137904527102,
      "deflection": 0.004141182525071718,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1594",
      "improvement_over_parent": null
    },
    "node_1596": {
      "node_id": "node_1596",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1595",
      "improvement_over_parent": null
    },
    "node_1597": {
      "node_id": "node_1597",
      "content": "INITIAL DESIGN (Trace 228)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 238.21 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.74e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.20574777846136,
      "fos_buckling": 0.5218833317255812,
      "fos_yielding": 1.5729107090574002,
      "deflection": 0.007740501165000223,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1598": {
      "node_id": "node_1598",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.79 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.25e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.78767894640725,
      "fos_buckling": 1.286809462483084,
      "fos_yielding": 2.0133184214552124,
      "deflection": 0.00425058842974147,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1597",
      "improvement_over_parent": null
    },
    "node_1599": {
      "node_id": "node_1599",
      "content": "MODIFICATION: Increase 4 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 284.62 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.20e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 284.6178265169571,
      "fos_buckling": 1.333017103579653,
      "fos_yielding": 2.0140335261897317,
      "deflection": 0.004196674894859981,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.385)"
      },
      "parent_node_id": "node_1598",
      "improvement_over_parent": null
    },
    "node_1600": {
      "node_id": "node_1600",
      "content": "MODIFICATION: Increase 7 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.24944405095005,
      "fos_buckling": 1.5229118505170862,
      "fos_yielding": 2.012441008638634,
      "deflection": 0.004040342162335757,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.274)"
      },
      "parent_node_id": "node_1599",
      "improvement_over_parent": null
    },
    "node_1601": {
      "node_id": "node_1601",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1600",
      "improvement_over_parent": null
    },
    "node_1602": {
      "node_id": "node_1602",
      "content": "INITIAL DESIGN (Trace 229)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n\nPerformance:\n  Mass: 119.98 kg\n  Factor of Safety: 0.01\n  Max Deflection: 8.65e+14 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 119.98177681665334,
      "fos_buckling": 0.00827076271843376,
      "fos_yielding": 0.017582927676193367,
      "deflection": 865386674290268.9,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1603": {
      "node_id": "node_1603",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n\nPerformance:\n  Mass: 141.75 kg\n  Factor of Safety: 0.46\n  Max Deflection: 1.10e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.75090993305858,
      "fos_buckling": 0.45546543348694274,
      "fos_yielding": 1.1253073712763755,
      "deflection": 11034161423691.734,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_1602",
      "improvement_over_parent": null
    },
    "node_1604": {
      "node_id": "node_1604",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n\nPerformance:\n  Mass: 156.05 kg\n  Factor of Safety: 0.37\n  Max Deflection: 1.32e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 156.04724881829097,
      "fos_buckling": 0.3651485330670836,
      "fos_yielding": 1.033377792764931,
      "deflection": 0.013197268554107461,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002293)"
      },
      "parent_node_id": "node_1603",
      "improvement_over_parent": null
    },
    "node_1605": {
      "node_id": "node_1605",
      "content": "MODIFICATION: Increase 9 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 162.06 kg\n  Factor of Safety: 0.36\n  Max Deflection: 1.18e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.05999119096785,
      "fos_buckling": 0.36499707714862517,
      "fos_yielding": 1.0329786137635604,
      "deflection": 0.01176553874504712,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.445)"
      },
      "parent_node_id": "node_1604",
      "improvement_over_parent": null
    },
    "node_1606": {
      "node_id": "node_1606",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 196.34 kg\n  Factor of Safety: 0.43\n  Max Deflection: 9.73e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.34031065685568,
      "fos_buckling": 0.4308173541146583,
      "fos_yielding": 1.2500629751073178,
      "deflection": 0.009726294777520168,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.227)"
      },
      "parent_node_id": "node_1605",
      "improvement_over_parent": null
    },
    "node_1607": {
      "node_id": "node_1607",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 231.75 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.15e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.7509701197427,
      "fos_buckling": 1.205239155724071,
      "fos_yielding": 1.6055081128163022,
      "deflection": 0.005145255054160639,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004878)"
      },
      "parent_node_id": "node_1606",
      "improvement_over_parent": null
    },
    "node_1608": {
      "node_id": "node_1608",
      "content": "MODIFICATION: Increase 5 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 232.75 kg\n  Factor of Safety: 1.26\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.7466341623018,
      "fos_buckling": 1.2586877654635722,
      "fos_yielding": 1.5992335289540345,
      "deflection": 0.005072896288697925,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.340)"
      },
      "parent_node_id": "node_1607",
      "improvement_over_parent": null
    },
    "node_1609": {
      "node_id": "node_1609",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.96 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.9622507790169,
      "fos_buckling": 1.522500489017912,
      "fos_yielding": 2.0102617829126066,
      "deflection": 0.004044312844930083,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.284)"
      },
      "parent_node_id": "node_1608",
      "improvement_over_parent": null
    },
    "node_1610": {
      "node_id": "node_1610",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1609",
      "improvement_over_parent": null
    },
    "node_1611": {
      "node_id": "node_1611",
      "content": "INITIAL DESIGN (Trace 230)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 183.88 kg\n  Factor of Safety: 0.72\n  Max Deflection: 9.02e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.88337867896644,
      "fos_buckling": 0.7181921838973877,
      "fos_yielding": 1.4957071221339227,
      "deflection": 0.009015323010832113,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1612": {
      "node_id": "node_1612",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 220.80 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.80452210469713,
      "fos_buckling": 0.8421276025645698,
      "fos_yielding": 1.7937508674588563,
      "deflection": 0.007518315770036498,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.215)"
      },
      "parent_node_id": "node_1611",
      "improvement_over_parent": null
    },
    "node_1613": {
      "node_id": "node_1613",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 224.87 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.87366445958054,
      "fos_buckling": 1.209128596824537,
      "fos_yielding": 1.5717517460575838,
      "deflection": 0.00522560647933642,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002526)"
      },
      "parent_node_id": "node_1612",
      "improvement_over_parent": null
    },
    "node_1614": {
      "node_id": "node_1614",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 253.54 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.64e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.54309596760254,
      "fos_buckling": 1.3376623613938297,
      "fos_yielding": 1.7707259144985137,
      "deflection": 0.004642550245038888,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_1613",
      "improvement_over_parent": null
    },
    "node_1615": {
      "node_id": "node_1615",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 287.98 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.9847728813591,
      "fos_buckling": 1.4845578111224782,
      "fos_yielding": 2.0093271532743455,
      "deflection": 0.004095610174880956,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.149)"
      },
      "parent_node_id": "node_1614",
      "improvement_over_parent": null
    },
    "node_1616": {
      "node_id": "node_1616",
      "content": "MODIFICATION: Increase 2 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 292.88 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.05e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.87710161216233,
      "fos_buckling": 1.5214167491024562,
      "fos_yielding": 2.010006675086942,
      "deflection": 0.004045424078366399,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.256)"
      },
      "parent_node_id": "node_1615",
      "improvement_over_parent": null
    },
    "node_1617": {
      "node_id": "node_1617",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1616",
      "improvement_over_parent": null
    },
    "node_1618": {
      "node_id": "node_1618",
      "content": "INITIAL DESIGN (Trace 231)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 138.20 kg\n  Factor of Safety: 0.61\n  Max Deflection: 9.19e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 138.2032529259177,
      "fos_buckling": 0.6148474314071865,
      "fos_yielding": 1.1991959467012376,
      "deflection": 0.009192418369126844,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1619": {
      "node_id": "node_1619",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 177.23 kg\n  Factor of Safety: 0.77\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.22718738952372,
      "fos_buckling": 0.7669750523316715,
      "fos_yielding": 1.536954845798203,
      "deflection": 0.007187565133165632,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_1618",
      "improvement_over_parent": null
    },
    "node_1620": {
      "node_id": "node_1620",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 227.15 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.63e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.14514265407547,
      "fos_buckling": 0.948001674857131,
      "fos_yielding": 1.9684176078159348,
      "deflection": 0.005627323150086271,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_1619",
      "improvement_over_parent": null
    },
    "node_1621": {
      "node_id": "node_1621",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 264.22 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.22012006530434,
      "fos_buckling": 1.072685316363608,
      "fos_yielding": 2.288428227518663,
      "deflection": 0.004850116036416569,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.179)"
      },
      "parent_node_id": "node_1620",
      "improvement_over_parent": null
    },
    "node_1622": {
      "node_id": "node_1622",
      "content": "MODIFICATION: Increase 8 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.91 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.91174047759256,
      "fos_buckling": 1.072340612356707,
      "fos_yielding": 2.2877612983749533,
      "deflection": 0.004851537195211081,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.196)"
      },
      "parent_node_id": "node_1621",
      "improvement_over_parent": null
    },
    "node_1623": {
      "node_id": "node_1623",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.29 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2932124384247,
      "fos_buckling": 1.5231429622001247,
      "fos_yielding": 2.013021143292825,
      "deflection": 0.004039714461530256,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1622",
      "improvement_over_parent": null
    },
    "node_1624": {
      "node_id": "node_1624",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1623",
      "improvement_over_parent": null
    },
    "node_1625": {
      "node_id": "node_1625",
      "content": "INITIAL DESIGN (Trace 232)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1626": {
      "node_id": "node_1626",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n\nPerformance:\n  Mass: 210.48 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.13e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.4750237892728,
      "fos_buckling": 0.8929140179121028,
      "fos_yielding": 1.7096556569904404,
      "deflection": 0.0061330808631220365,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004264)"
      },
      "parent_node_id": "node_1625",
      "improvement_over_parent": null
    },
    "node_1627": {
      "node_id": "node_1627",
      "content": "MODIFICATION: Increase 1 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n\nPerformance:\n  Mass: 219.27 kg\n  Factor of Safety: 0.89\n  Max Deflection: 5.86e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.2669224604837,
      "fos_buckling": 0.8923745394655628,
      "fos_yielding": 1.7395751082370838,
      "deflection": 0.005861836307600229,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.443)"
      },
      "parent_node_id": "node_1626",
      "improvement_over_parent": null
    },
    "node_1628": {
      "node_id": "node_1628",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n\nPerformance:\n  Mass: 247.64 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.74e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.6438407937753,
      "fos_buckling": 1.3127880638789282,
      "fos_yielding": 1.7509847711828876,
      "deflection": 0.004736193833062381,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004579)"
      },
      "parent_node_id": "node_1627",
      "improvement_over_parent": null
    },
    "node_1629": {
      "node_id": "node_1629",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 287.17 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.1701464603914,
      "fos_buckling": 1.4823475502768486,
      "fos_yielding": 2.028008098021715,
      "deflection": 0.004094029497171294,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.175)"
      },
      "parent_node_id": "node_1628",
      "improvement_over_parent": null
    },
    "node_1630": {
      "node_id": "node_1630",
      "content": "MODIFICATION: Increase 9 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.15 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.1529015248409,
      "fos_buckling": 1.4801361906900832,
      "fos_yielding": 2.028555134441225,
      "deflection": 0.004049587730606822,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.261)"
      },
      "parent_node_id": "node_1629",
      "improvement_over_parent": null
    },
    "node_1631": {
      "node_id": "node_1631",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1630",
      "improvement_over_parent": null
    },
    "node_1632": {
      "node_id": "node_1632",
      "content": "INITIAL DESIGN (Trace 233)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 207.03 kg\n  Factor of Safety: 0.17\n  Max Deflection: 2.76e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.0283379156811,
      "fos_buckling": 0.16835677506515462,
      "fos_yielding": 0.7545064217469196,
      "deflection": 27565255504657.062,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1633": {
      "node_id": "node_1633",
      "content": "MODIFICATION: Increase 1 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 216.95 kg\n  Factor of Safety: 0.70\n  Max Deflection: 1.27e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.95335707877967,
      "fos_buckling": 0.6972253263370077,
      "fos_yielding": 1.6214195639756264,
      "deflection": 12731113102293.902,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.433)"
      },
      "parent_node_id": "node_1632",
      "improvement_over_parent": null
    },
    "node_1634": {
      "node_id": "node_1634",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 222.17 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.65e+12 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.16718711259378,
      "fos_buckling": 0.4791249744936043,
      "fos_yielding": 1.1253073712763755,
      "deflection": 8652062369819.769,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_1633",
      "improvement_over_parent": null
    },
    "node_1635": {
      "node_id": "node_1635",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 248.06 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.42e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.06462425498356,
      "fos_buckling": 0.5883785796540216,
      "fos_yielding": 1.3703811201327636,
      "deflection": 0.007417818804319818,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1634",
      "improvement_over_parent": null
    },
    "node_1636": {
      "node_id": "node_1636",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 291.26 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.26268219243576,
      "fos_buckling": 1.2940830739722144,
      "fos_yielding": 2.0116463187821227,
      "deflection": 0.00409394094523617,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1635",
      "improvement_over_parent": null
    },
    "node_1637": {
      "node_id": "node_1637",
      "content": "MODIFICATION: Increase 4 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0065)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 294.95 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.04e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.950066905648,
      "fos_buckling": 1.2951892172152342,
      "fos_yielding": 2.142849695163173,
      "deflection": 0.004040933581393722,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.425)"
      },
      "parent_node_id": "node_1636",
      "improvement_over_parent": null
    },
    "node_1638": {
      "node_id": "node_1638",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1637",
      "improvement_over_parent": null
    },
    "node_1639": {
      "node_id": "node_1639",
      "content": "INITIAL DESIGN (Trace 234)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0022)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 173.85 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.07e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.85169975977084,
      "fos_buckling": 0.8797880928518614,
      "fos_yielding": 1.797513008735777,
      "deflection": 0.007065776691825277,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1640": {
      "node_id": "node_1640",
      "content": "MODIFICATION: Increase 0 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0022)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 183.33 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.83e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.3293482463087,
      "fos_buckling": 0.8196423514864781,
      "fos_yielding": 1.797513008735777,
      "deflection": 0.006833475947801107,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.590)"
      },
      "parent_node_id": "node_1639",
      "improvement_over_parent": null
    },
    "node_1641": {
      "node_id": "node_1641",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 210.50 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.96e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.50054741089346,
      "fos_buckling": 0.9334621842802611,
      "fos_yielding": 2.0618601710808133,
      "deflection": 0.0059605131272706885,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.160)"
      },
      "parent_node_id": "node_1640",
      "improvement_over_parent": null
    },
    "node_1642": {
      "node_id": "node_1642",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 233.85 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.37e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.84550387971245,
      "fos_buckling": 1.029661908970238,
      "fos_yielding": 2.2884923082768136,
      "deflection": 0.0053724988808939965,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.121)"
      },
      "parent_node_id": "node_1641",
      "improvement_over_parent": null
    },
    "node_1643": {
      "node_id": "node_1643",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 264.82 kg\n  Factor of Safety: 1.01\n  Max Deflection: 4.66e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.82404992878884,
      "fos_buckling": 1.005394794811664,
      "fos_yielding": 2.0383868229188233,
      "deflection": 0.004661360699056918,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1642",
      "improvement_over_parent": null
    },
    "node_1644": {
      "node_id": "node_1644",
      "content": "MODIFICATION: Increase 7 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 272.13 kg\n  Factor of Safety: 1.19\n  Max Deflection: 4.41e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 272.1341270063674,
      "fos_buckling": 1.1936465064670234,
      "fos_yielding": 2.036106653337805,
      "deflection": 0.0044088736650655545,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.362)"
      },
      "parent_node_id": "node_1643",
      "improvement_over_parent": null
    },
    "node_1645": {
      "node_id": "node_1645",
      "content": "MODIFICATION: Increase 7 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 286.61 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.6073625664416,
      "fos_buckling": 1.465267325816575,
      "fos_yielding": 2.033287930052005,
      "deflection": 0.004109204598918004,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.553)"
      },
      "parent_node_id": "node_1644",
      "improvement_over_parent": null
    },
    "node_1646": {
      "node_id": "node_1646",
      "content": "MODIFICATION: Increase 3 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.17 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1668198999549,
      "fos_buckling": 1.5226210224712045,
      "fos_yielding": 2.0119874331150576,
      "deflection": 0.004041466045410731,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.404)"
      },
      "parent_node_id": "node_1645",
      "improvement_over_parent": null
    },
    "node_1647": {
      "node_id": "node_1647",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1646",
      "improvement_over_parent": null
    },
    "node_1648": {
      "node_id": "node_1648",
      "content": "INITIAL DESIGN (Trace 235)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 157.95 kg\n  Factor of Safety: 0.76\n  Max Deflection: 8.70e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.94594964192268,
      "fos_buckling": 0.7648196278811288,
      "fos_yielding": 1.52991054851679,
      "deflection": 0.00870363496302156,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1649": {
      "node_id": "node_1649",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n\nPerformance:\n  Mass: 173.46 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.03e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.46158113080904,
      "fos_buckling": 0.848349356435215,
      "fos_yielding": 1.3324898242927685,
      "deflection": 0.007025292952890381,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002497)"
      },
      "parent_node_id": "node_1648",
      "improvement_over_parent": null
    },
    "node_1650": {
      "node_id": "node_1650",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n\nPerformance:\n  Mass: 203.27 kg\n  Factor of Safety: 0.98\n  Max Deflection: 6.00e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.26915375897167,
      "fos_buckling": 0.9807574951270606,
      "fos_yielding": 1.559008443130485,
      "deflection": 0.006002204250752577,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.183)"
      },
      "parent_node_id": "node_1649",
      "improvement_over_parent": null
    },
    "node_1651": {
      "node_id": "node_1651",
      "content": "MODIFICATION: Increase 7 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n\nPerformance:\n  Mass: 213.68 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.66e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.67575188804068,
      "fos_buckling": 1.242905230794589,
      "fos_yielding": 1.5572746887178923,
      "deflection": 0.0056579425240066965,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.477)"
      },
      "parent_node_id": "node_1650",
      "improvement_over_parent": null
    },
    "node_1652": {
      "node_id": "node_1652",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 273.37 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.43e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 273.36933638202225,
      "fos_buckling": 1.523014758046955,
      "fos_yielding": 1.9878488395093823,
      "deflection": 0.004434003125433301,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.305)"
      },
      "parent_node_id": "node_1651",
      "improvement_over_parent": null
    },
    "node_1653": {
      "node_id": "node_1653",
      "content": "MODIFICATION: Increase 9 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0085)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 287.17 kg\n  Factor of Safety: 1.53\n  Max Deflection: 4.28e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 287.1652870844877,
      "fos_buckling": 1.5251813188666044,
      "fos_yielding": 2.0099864469074586,
      "deflection": 0.004276588218182879,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.353)"
      },
      "parent_node_id": "node_1652",
      "improvement_over_parent": null
    },
    "node_1654": {
      "node_id": "node_1654",
      "content": "MODIFICATION: Increase 1 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0085)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 299.32 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.92e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 299.3166071445474,
      "fos_buckling": 1.5319966178590008,
      "fos_yielding": 2.0608047359983543,
      "deflection": 0.003924581901848167,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.582)"
      },
      "parent_node_id": "node_1653",
      "improvement_over_parent": null
    },
    "node_1655": {
      "node_id": "node_1655",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1654",
      "improvement_over_parent": null
    },
    "node_1656": {
      "node_id": "node_1656",
      "content": "INITIAL DESIGN (Trace 236)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1657": {
      "node_id": "node_1657",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 253.77 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.94e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.77093225408146,
      "fos_buckling": 1.0732119940131104,
      "fos_yielding": 2.2880718948682164,
      "deflection": 0.004942578874973333,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1656",
      "improvement_over_parent": null
    },
    "node_1658": {
      "node_id": "node_1658",
      "content": "MODIFICATION: Increase 8 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0087)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 268.62 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.56e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.6235956523635,
      "fos_buckling": 1.3434431255484596,
      "fos_yielding": 2.2880718948682164,
      "deflection": 0.004555970027246886,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.381)"
      },
      "parent_node_id": "node_1657",
      "improvement_over_parent": null
    },
    "node_1659": {
      "node_id": "node_1659",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0087)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 299.60 kg\n  Factor of Safety: 1.46\n  Max Deflection: 3.94e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 299.6021417014399,
      "fos_buckling": 1.463008899031,
      "fos_yielding": 2.041601077149762,
      "deflection": 0.003942155218229332,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1658",
      "improvement_over_parent": null
    },
    "node_1660": {
      "node_id": "node_1660",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1659",
      "improvement_over_parent": null
    },
    "node_1661": {
      "node_id": "node_1661",
      "content": "INITIAL DESIGN (Trace 237)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 239.73 kg\n  Factor of Safety: 0.39\n  Max Deflection: 8.66e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.72948263699712,
      "fos_buckling": 0.385803879459598,
      "fos_yielding": 1.4480804136114986,
      "deflection": 0.008659207235486062,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1662": {
      "node_id": "node_1662",
      "content": "MODIFICATION: Increase 3 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 247.00 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.84e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.9951087717969,
      "fos_buckling": 0.5214251306175601,
      "fos_yielding": 1.447328857365893,
      "deflection": 0.007838566587750319,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.466)"
      },
      "parent_node_id": "node_1661",
      "improvement_over_parent": null
    },
    "node_1663": {
      "node_id": "node_1663",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 291.58 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.5770399397428,
      "fos_buckling": 1.3738465126037853,
      "fos_yielding": 2.0237034523634154,
      "deflection": 0.0041222336174259605,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1662",
      "improvement_over_parent": null
    },
    "node_1664": {
      "node_id": "node_1664",
      "content": "MODIFICATION: Increase 5 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2153602199532,
      "fos_buckling": 1.5228534919850305,
      "fos_yielding": 2.0124660975931765,
      "deflection": 0.004040669039059885,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.502)"
      },
      "parent_node_id": "node_1663",
      "improvement_over_parent": null
    },
    "node_1665": {
      "node_id": "node_1665",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1664",
      "improvement_over_parent": null
    },
    "node_1666": {
      "node_id": "node_1666",
      "content": "INITIAL DESIGN (Trace 238)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 141.67 kg\n  Factor of Safety: 0.64\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.67321908685616,
      "fos_buckling": 0.6364236101594052,
      "fos_yielding": 1.3351598841070118,
      "deflection": 0.010098866767529836,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1667": {
      "node_id": "node_1667",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n\nPerformance:\n  Mass: 155.89 kg\n  Factor of Safety: 0.64\n  Max Deflection: 8.53e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.89139362416637,
      "fos_buckling": 0.6357992017449347,
      "fos_yielding": 1.1684674783397277,
      "deflection": 0.008530152691574618,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002727)"
      },
      "parent_node_id": "node_1666",
      "improvement_over_parent": null
    },
    "node_1668": {
      "node_id": "node_1668",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n\nPerformance:\n  Mass: 194.06 kg\n  Factor of Safety: 0.77\n  Max Deflection: 6.87e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.0639515546565,
      "fos_buckling": 0.7705891445260519,
      "fos_yielding": 1.453241623877505,
      "deflection": 0.00686845606865668,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.261)"
      },
      "parent_node_id": "node_1667",
      "improvement_over_parent": null
    },
    "node_1669": {
      "node_id": "node_1669",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n\nPerformance:\n  Mass: 212.86 kg\n  Factor of Safety: 1.17\n  Max Deflection: 5.54e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.8587133333523,
      "fos_buckling": 1.1654614523210058,
      "fos_yielding": 1.4635705985166207,
      "deflection": 0.005540339745374135,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003543)"
      },
      "parent_node_id": "node_1668",
      "improvement_over_parent": null
    },
    "node_1670": {
      "node_id": "node_1670",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n\nPerformance:\n  Mass: 252.81 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.68e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.81423539374245,
      "fos_buckling": 1.3487552858328138,
      "fos_yielding": 1.7367294781716935,
      "deflection": 0.004675572517613023,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.203)"
      },
      "parent_node_id": "node_1669",
      "improvement_over_parent": null
    },
    "node_1671": {
      "node_id": "node_1671",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.09 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0905743714524,
      "fos_buckling": 1.5223607427042984,
      "fos_yielding": 2.0115837166303843,
      "deflection": 0.00404248762046282,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.175)"
      },
      "parent_node_id": "node_1670",
      "improvement_over_parent": null
    },
    "node_1672": {
      "node_id": "node_1672",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1671",
      "improvement_over_parent": null
    },
    "node_1673": {
      "node_id": "node_1673",
      "content": "INITIAL DESIGN (Trace 239)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 251.75 kg\n  Factor of Safety: 1.12\n  Max Deflection: 4.70e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.75256573484353,
      "fos_buckling": 1.120542295141541,
      "fos_yielding": 1.291623705641353,
      "deflection": 0.004695605324916235,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1674": {
      "node_id": "node_1674",
      "content": "MODIFICATION: Increase 6 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 254.37 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.61e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.36997475629158,
      "fos_buckling": 1.3266066696273637,
      "fos_yielding": 1.805025973306242,
      "deflection": 0.004606319656472398,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.449)"
      },
      "parent_node_id": "node_1673",
      "improvement_over_parent": null
    },
    "node_1675": {
      "node_id": "node_1675",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 283.61 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.6139100447312,
      "fos_buckling": 1.4499816037621975,
      "fos_yielding": 2.010667223818321,
      "deflection": 0.004138533616515373,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.126)"
      },
      "parent_node_id": "node_1674",
      "improvement_over_parent": null
    },
    "node_1676": {
      "node_id": "node_1676",
      "content": "MODIFICATION: Increase 8 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1994447749314,
      "fos_buckling": 1.5227919046997722,
      "fos_yielding": 2.011929590296354,
      "deflection": 0.004041022458042741,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.451)"
      },
      "parent_node_id": "node_1675",
      "improvement_over_parent": null
    },
    "node_1677": {
      "node_id": "node_1677",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1676",
      "improvement_over_parent": null
    },
    "node_1678": {
      "node_id": "node_1678",
      "content": "INITIAL DESIGN (Trace 240)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 148.10 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.16e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 148.09958826249283,
      "fos_buckling": 0.4372821418902695,
      "fos_yielding": 1.337683600710507,
      "deflection": 0.011590891654642322,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1679": {
      "node_id": "node_1679",
      "content": "MODIFICATION: Increase 8 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 153.41 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.4135581985081,
      "fos_buckling": 0.4371217526753627,
      "fos_yielding": 1.3374228712257072,
      "deflection": 0.01113999682778418,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.218)"
      },
      "parent_node_id": "node_1678",
      "improvement_over_parent": null
    },
    "node_1680": {
      "node_id": "node_1680",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 184.41 kg\n  Factor of Safety: 0.51\n  Max Deflection: 9.29e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.40844749317543,
      "fos_buckling": 0.5116818909746296,
      "fos_yielding": 1.6048078155217536,
      "deflection": 0.009285175210930275,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.218)"
      },
      "parent_node_id": "node_1679",
      "improvement_over_parent": null
    },
    "node_1681": {
      "node_id": "node_1681",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n\nPerformance:\n  Mass: 220.78 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.75e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.7800397685208,
      "fos_buckling": 0.931497600520307,
      "fos_yielding": 1.9267300662554019,
      "deflection": 0.005747182278440273,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005113)"
      },
      "parent_node_id": "node_1680",
      "improvement_over_parent": null
    },
    "node_1682": {
      "node_id": "node_1682",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 246.87 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.79e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.86580435352724,
      "fos_buckling": 1.322378259078745,
      "fos_yielding": 1.6958481730645933,
      "deflection": 0.004786622231883995,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004330)"
      },
      "parent_node_id": "node_1681",
      "improvement_over_parent": null
    },
    "node_1683": {
      "node_id": "node_1683",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.17 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1687802579487,
      "fos_buckling": 1.5229134435278717,
      "fos_yielding": 2.011830765750418,
      "deflection": 0.004041461960932144,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.206)"
      },
      "parent_node_id": "node_1682",
      "improvement_over_parent": null
    },
    "node_1684": {
      "node_id": "node_1684",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1683",
      "improvement_over_parent": null
    },
    "node_1685": {
      "node_id": "node_1685",
      "content": "INITIAL DESIGN (Trace 241)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 168.06 kg\n  Factor of Safety: 1.00\n  Max Deflection: 7.56e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.0649968292169,
      "fos_buckling": 0.9975866283298346,
      "fos_yielding": 1.767545119451328,
      "deflection": 7555380144089.878,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1686": {
      "node_id": "node_1686",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 202.49 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.26e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 202.48714691229583,
      "fos_buckling": 0.8655937191516534,
      "fos_yielding": 1.767545119451328,
      "deflection": 0.0062594539026676645,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004732)"
      },
      "parent_node_id": "node_1685",
      "improvement_over_parent": null
    },
    "node_1687": {
      "node_id": "node_1687",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 226.41 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.21e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.4103475420715,
      "fos_buckling": 1.2288372182735938,
      "fos_yielding": 1.556200583311835,
      "deflection": 0.005212912477829227,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003945)"
      },
      "parent_node_id": "node_1686",
      "improvement_over_parent": null
    },
    "node_1688": {
      "node_id": "node_1688",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.44 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4444882656855,
      "fos_buckling": 1.523798734517378,
      "fos_yielding": 2.013905830890871,
      "deflection": 0.004037754360717164,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.325)"
      },
      "parent_node_id": "node_1687",
      "improvement_over_parent": null
    },
    "node_1689": {
      "node_id": "node_1689",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1688",
      "improvement_over_parent": null
    },
    "node_1690": {
      "node_id": "node_1690",
      "content": "INITIAL DESIGN (Trace 242)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0021)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0018)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0014)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0016)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0022)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0019)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0022)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1691": {
      "node_id": "node_1691",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0021)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0018)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0014)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0016)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0022)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0019)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0022)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0017)]\n\nPerformance:\n  Mass: 98.00 kg\n  Factor of Safety: 0.45\n  Max Deflection: 1.28e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 98.00001736260384,
      "fos_buckling": 0.45094833777820775,
      "fos_yielding": 0.8562091269111861,
      "deflection": 0.012847508515163922,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.001716)"
      },
      "parent_node_id": "node_1690",
      "improvement_over_parent": null
    },
    "node_1692": {
      "node_id": "node_1692",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0021)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0018)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0014)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0016)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0022)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0019)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0022)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0017)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0018)]\n\nPerformance:\n  Mass: 109.58 kg\n  Factor of Safety: 0.64\n  Max Deflection: 1.07e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 109.57634959376948,
      "fos_buckling": 0.6400064710383317,
      "fos_yielding": 0.7551915932378799,
      "deflection": 0.010697754300103918,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.001843)"
      },
      "parent_node_id": "node_1691",
      "improvement_over_parent": null
    },
    "node_1693": {
      "node_id": "node_1693",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n\nPerformance:\n  Mass: 143.55 kg\n  Factor of Safety: 0.82\n  Max Deflection: 8.18e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 143.55061043454864,
      "fos_buckling": 0.8211064797419001,
      "fos_yielding": 0.9885794499641334,
      "deflection": 0.008182146763019597,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.323)"
      },
      "parent_node_id": "node_1692",
      "improvement_over_parent": null
    },
    "node_1694": {
      "node_id": "node_1694",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 186.76 kg\n  Factor of Safety: 1.04\n  Max Deflection: 6.30e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.76384824951984,
      "fos_buckling": 1.0397252854732049,
      "fos_yielding": 1.284917223913056,
      "deflection": 0.006304846772194945,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.318)"
      },
      "parent_node_id": "node_1693",
      "improvement_over_parent": null
    },
    "node_1695": {
      "node_id": "node_1695",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 241.24 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.90e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.2422174184953,
      "fos_buckling": 1.296759451098395,
      "fos_yielding": 1.6576827972910575,
      "deflection": 0.004896554895654864,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.314)"
      },
      "parent_node_id": "node_1694",
      "improvement_over_parent": null
    },
    "node_1696": {
      "node_id": "node_1696",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.52 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.5218264680383,
      "fos_buckling": 1.5241045255071604,
      "fos_yielding": 2.0145425683076477,
      "deflection": 0.004036644344946194,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.238)"
      },
      "parent_node_id": "node_1695",
      "improvement_over_parent": null
    },
    "node_1697": {
      "node_id": "node_1697",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1696",
      "improvement_over_parent": null
    },
    "node_1698": {
      "node_id": "node_1698",
      "content": "INITIAL DESIGN (Trace 243)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1699": {
      "node_id": "node_1699",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n\nPerformance:\n  Mass: 136.00 kg\n  Factor of Safety: 0.99\n  Max Deflection: 4.74e+12 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 135.99889908409813,
      "fos_buckling": 0.9922607923594118,
      "fos_yielding": 1.550769495157951,
      "deflection": 4744357538110.92,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.002664)"
      },
      "parent_node_id": "node_1698",
      "improvement_over_parent": null
    },
    "node_1700": {
      "node_id": "node_1700",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 171.79 kg\n  Factor of Safety: 0.49\n  Max Deflection: 1.12e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.79428857325655,
      "fos_buckling": 0.49180801128485896,
      "fos_yielding": 1.5300016431159145,
      "deflection": 0.011173083505253431,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004935)"
      },
      "parent_node_id": "node_1699",
      "improvement_over_parent": null
    },
    "node_1701": {
      "node_id": "node_1701",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n\nPerformance:\n  Mass: 206.48 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.20e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.47984754436558,
      "fos_buckling": 0.8950995899107432,
      "fos_yielding": 1.8373766196270365,
      "deflection": 0.00619618880280051,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004858)"
      },
      "parent_node_id": "node_1700",
      "improvement_over_parent": null
    },
    "node_1702": {
      "node_id": "node_1702",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 257.23 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.99e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.2292239732676,
      "fos_buckling": 1.0726616620024891,
      "fos_yielding": 2.2864197312931416,
      "deflection": 0.004990159116741626,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.269)"
      },
      "parent_node_id": "node_1701",
      "improvement_over_parent": null
    },
    "node_1703": {
      "node_id": "node_1703",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 281.61 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.17e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.6106959340997,
      "fos_buckling": 1.4303801202503468,
      "fos_yielding": 2.0101744017836958,
      "deflection": 0.004166044077512908,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1702",
      "improvement_over_parent": null
    },
    "node_1704": {
      "node_id": "node_1704",
      "content": "MODIFICATION: Increase 8 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0100)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 304.18 kg\n  Factor of Safety: 1.43\n  Max Deflection: 3.92e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 304.1767750185527,
      "fos_buckling": 1.4331822511442036,
      "fos_yielding": 2.0517103499854725,
      "deflection": 0.003917674396620228,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.592)"
      },
      "parent_node_id": "node_1703",
      "improvement_over_parent": null
    },
    "node_1705": {
      "node_id": "node_1705",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1704",
      "improvement_over_parent": null
    },
    "node_1706": {
      "node_id": "node_1706",
      "content": "INITIAL DESIGN (Trace 244)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 175.94 kg\n  Factor of Safety: 0.71\n  Max Deflection: 8.30e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.94459241749237,
      "fos_buckling": 0.7119879668514579,
      "fos_yielding": 1.7065193934071674,
      "deflection": 0.008299620738609868,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1707": {
      "node_id": "node_1707",
      "content": "MODIFICATION: Increase 7 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 180.15 kg\n  Factor of Safety: 0.71\n  Max Deflection: 8.30e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.14679464070505,
      "fos_buckling": 0.7117817731384902,
      "fos_yielding": 1.7065193934071674,
      "deflection": 0.008299710070143757,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.221)"
      },
      "parent_node_id": "node_1706",
      "improvement_over_parent": null
    },
    "node_1708": {
      "node_id": "node_1708",
      "content": "MODIFICATION: Increase 3 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 185.82 kg\n  Factor of Safety: 0.71\n  Max Deflection: 8.30e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.8150597062701,
      "fos_buckling": 0.7115038317572462,
      "fos_yielding": 1.7059179491046697,
      "deflection": 0.008302968691980661,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.484)"
      },
      "parent_node_id": "node_1707",
      "improvement_over_parent": null
    },
    "node_1709": {
      "node_id": "node_1709",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 220.69 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.00e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.69142283602292,
      "fos_buckling": 0.8282390888995212,
      "fos_yielding": 2.0247441747016044,
      "deflection": 0.006997185940809585,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.203)"
      },
      "parent_node_id": "node_1708",
      "improvement_over_parent": null
    },
    "node_1710": {
      "node_id": "node_1710",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 248.10 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.00e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.104261797297,
      "fos_buckling": 0.8340955419734332,
      "fos_yielding": 2.0132071307880337,
      "deflection": 0.006995394668804318,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004569)"
      },
      "parent_node_id": "node_1709",
      "improvement_over_parent": null
    },
    "node_1711": {
      "node_id": "node_1711",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 252.72 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.71e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.7170972373752,
      "fos_buckling": 1.223768230471042,
      "fos_yielding": 1.7622060355132017,
      "deflection": 0.004713508064726824,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002892)"
      },
      "parent_node_id": "node_1710",
      "improvement_over_parent": null
    },
    "node_1712": {
      "node_id": "node_1712",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 285.69 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.18e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.689178712389,
      "fos_buckling": 1.3595964360977733,
      "fos_yielding": 1.9903035272493947,
      "deflection": 0.004176928783419372,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.143)"
      },
      "parent_node_id": "node_1711",
      "improvement_over_parent": null
    },
    "node_1713": {
      "node_id": "node_1713",
      "content": "MODIFICATION: Increase 10 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0040)]\n\nPerformance:\n  Mass: 286.71 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.7134424153935,
      "fos_buckling": 1.37015061175969,
      "fos_yielding": 1.986111747064013,
      "deflection": 0.0041435803963904266,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.221)"
      },
      "parent_node_id": "node_1712",
      "improvement_over_parent": null
    },
    "node_1714": {
      "node_id": "node_1714",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1713",
      "improvement_over_parent": null
    },
    "node_1715": {
      "node_id": "node_1715",
      "content": "INITIAL DESIGN (Trace 245)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0016)]\n\nPerformance:\n  Mass: 97.22 kg\n  Factor of Safety: 0.30\n  Max Deflection: 2.38e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 97.2196413717031,
      "fos_buckling": 0.296757666420182,
      "fos_yielding": 0.6945699388451757,
      "deflection": 0.02377022890721029,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1716": {
      "node_id": "node_1716",
      "content": "MODIFICATION: Increase 8 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n\nPerformance:\n  Mass: 103.29 kg\n  Factor of Safety: 0.30\n  Max Deflection: 2.12e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 103.28687665540095,
      "fos_buckling": 0.29663297754343265,
      "fos_yielding": 0.6945699388451742,
      "deflection": 0.02116709676732496,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.634)"
      },
      "parent_node_id": "node_1715",
      "improvement_over_parent": null
    },
    "node_1717": {
      "node_id": "node_1717",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n\nPerformance:\n  Mass: 119.69 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.83e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 119.6924097397154,
      "fos_buckling": 0.3386315770394009,
      "fos_yielding": 0.8044772693927925,
      "deflection": 0.018286257181790357,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.167)"
      },
      "parent_node_id": "node_1716",
      "improvement_over_parent": null
    },
    "node_1718": {
      "node_id": "node_1718",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 146.45 kg\n  Factor of Safety: 0.38\n  Max Deflection: 1.21e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.44819861353452,
      "fos_buckling": 0.3813505371547179,
      "fos_yielding": 1.1475263403822733,
      "deflection": 0.012138010747925285,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003621)"
      },
      "parent_node_id": "node_1717",
      "improvement_over_parent": null
    },
    "node_1719": {
      "node_id": "node_1719",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 189.71 kg\n  Factor of Safety: 0.48\n  Max Deflection: 9.39e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.7119178534108,
      "fos_buckling": 0.47775866379658843,
      "fos_yielding": 1.4824740114938266,
      "deflection": 0.009393922120679257,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.316)"
      },
      "parent_node_id": "node_1718",
      "improvement_over_parent": null
    },
    "node_1720": {
      "node_id": "node_1720",
      "content": "MODIFICATION: Increase 1 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 194.39 kg\n  Factor of Safety: 0.48\n  Max Deflection: 9.22e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.38897122932048,
      "fos_buckling": 0.47760485686229565,
      "fos_yielding": 1.482220161282604,
      "deflection": 0.009223307135564032,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.222)"
      },
      "parent_node_id": "node_1719",
      "improvement_over_parent": null
    },
    "node_1721": {
      "node_id": "node_1721",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 250.34 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.3428536623888,
      "fos_buckling": 0.5890507055896846,
      "fos_yielding": 1.9030958531745739,
      "deflection": 0.007185004317309757,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.316)"
      },
      "parent_node_id": "node_1720",
      "improvement_over_parent": null
    },
    "node_1722": {
      "node_id": "node_1722",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.54 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.540911599841,
      "fos_buckling": 1.5242825100509911,
      "fos_yielding": 2.0150617794724326,
      "deflection": 0.004036686817469619,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1721",
      "improvement_over_parent": null
    },
    "node_1723": {
      "node_id": "node_1723",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1722",
      "improvement_over_parent": null
    },
    "node_1724": {
      "node_id": "node_1724",
      "content": "INITIAL DESIGN (Trace 246)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 204.05 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.12e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.04849632715016,
      "fos_buckling": 0.5231251173311252,
      "fos_yielding": 1.3377205553178921,
      "deflection": 0.011176378675717117,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1725": {
      "node_id": "node_1725",
      "content": "MODIFICATION: Increase 4 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 205.45 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.10e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.447576014037,
      "fos_buckling": 0.5231251173311251,
      "fos_yielding": 1.3377205553178908,
      "deflection": 0.011033401066597311,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.272)"
      },
      "parent_node_id": "node_1724",
      "improvement_over_parent": null
    },
    "node_1726": {
      "node_id": "node_1726",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 250.03 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.02950718198286,
      "fos_buckling": 0.588404084958055,
      "fos_yielding": 1.9001415203879182,
      "deflection": 0.007194160714971482,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1725",
      "improvement_over_parent": null
    },
    "node_1727": {
      "node_id": "node_1727",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2275651194351,
      "fos_buckling": 1.5229056795062847,
      "fos_yielding": 2.0124445060046585,
      "deflection": 0.004040675114915641,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1726",
      "improvement_over_parent": null
    },
    "node_1728": {
      "node_id": "node_1728",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1727",
      "improvement_over_parent": null
    },
    "node_1729": {
      "node_id": "node_1729",
      "content": "INITIAL DESIGN (Trace 247)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 145.72 kg\n  Factor of Safety: 0.57\n  Max Deflection: 1.16e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 145.71519771162536,
      "fos_buckling": 0.5739321400147365,
      "fos_yielding": 1.1662922048572972,
      "deflection": 0.011565973707712052,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1730": {
      "node_id": "node_1730",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 175.72 kg\n  Factor of Safety: 0.68\n  Max Deflection: 9.60e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.7207294234843,
      "fos_buckling": 0.6794913365046111,
      "fos_yielding": 1.4052526095152602,
      "deflection": 0.009600576474586526,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.217)"
      },
      "parent_node_id": "node_1729",
      "improvement_over_parent": null
    },
    "node_1731": {
      "node_id": "node_1731",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 198.06 kg\n  Factor of Safety: 0.76\n  Max Deflection: 8.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.05549519747373,
      "fos_buckling": 0.7552844506702366,
      "fos_yielding": 1.5828591116313353,
      "deflection": 0.00852423922921014,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.135)"
      },
      "parent_node_id": "node_1730",
      "improvement_over_parent": null
    },
    "node_1732": {
      "node_id": "node_1732",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n\nPerformance:\n  Mass: 201.64 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.84e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.6397586206366,
      "fos_buckling": 1.11196000982972,
      "fos_yielding": 1.3867558966412947,
      "deflection": 0.005844906432303244,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002206)"
      },
      "parent_node_id": "node_1731",
      "improvement_over_parent": null
    },
    "node_1733": {
      "node_id": "node_1733",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 238.75 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.95e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.747260497483,
      "fos_buckling": 1.2854382905642534,
      "fos_yielding": 1.6405844569247767,
      "deflection": 0.00494712023121726,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.198)"
      },
      "parent_node_id": "node_1732",
      "improvement_over_parent": null
    },
    "node_1734": {
      "node_id": "node_1734",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.53 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.5337087673186,
      "fos_buckling": 1.5241555808207463,
      "fos_yielding": 2.014567461538584,
      "deflection": 0.004036572817432965,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.252)"
      },
      "parent_node_id": "node_1733",
      "improvement_over_parent": null
    },
    "node_1735": {
      "node_id": "node_1735",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1734",
      "improvement_over_parent": null
    },
    "node_1736": {
      "node_id": "node_1736",
      "content": "INITIAL DESIGN (Trace 248)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1737": {
      "node_id": "node_1737",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 216.18 kg\n  Factor of Safety: 0.92\n  Max Deflection: 6.66e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.18001389070733,
      "fos_buckling": 0.9166817135883408,
      "fos_yielding": 2.0357363512511375,
      "deflection": 0.006656071985924226,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004597)"
      },
      "parent_node_id": "node_1736",
      "improvement_over_parent": null
    },
    "node_1738": {
      "node_id": "node_1738",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n\nPerformance:\n  Mass: 239.23 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.44e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.22529130462414,
      "fos_buckling": 0.9748360126095842,
      "fos_yielding": 2.035736351251138,
      "deflection": 0.005443560139741456,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004412)"
      },
      "parent_node_id": "node_1737",
      "improvement_over_parent": null
    },
    "node_1739": {
      "node_id": "node_1739",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 260.92 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.53e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.9223120135216,
      "fos_buckling": 1.3845704177272937,
      "fos_yielding": 1.7920361119677428,
      "deflection": 0.0045324688963684304,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004281)"
      },
      "parent_node_id": "node_1738",
      "improvement_over_parent": null
    },
    "node_1740": {
      "node_id": "node_1740",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2166565645507,
      "fos_buckling": 1.5228532537161064,
      "fos_yielding": 2.0123714620417825,
      "deflection": 0.004040828185367958,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.136)"
      },
      "parent_node_id": "node_1739",
      "improvement_over_parent": null
    },
    "node_1741": {
      "node_id": "node_1741",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1740",
      "improvement_over_parent": null
    },
    "node_1742": {
      "node_id": "node_1742",
      "content": "INITIAL DESIGN (Trace 249)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1743": {
      "node_id": "node_1743",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 263.63 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.87e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.62686256509477,
      "fos_buckling": 1.0259695030322906,
      "fos_yielding": 2.2871342448230174,
      "deflection": 0.0058705422963809695,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1742",
      "improvement_over_parent": null
    },
    "node_1744": {
      "node_id": "node_1744",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 288.01 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.0083345259269,
      "fos_buckling": 1.0366379917234143,
      "fos_yielding": 2.2959072290957017,
      "deflection": 0.005879344908540537,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1743",
      "improvement_over_parent": null
    },
    "node_1745": {
      "node_id": "node_1745",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.222164559741,
      "fos_buckling": 1.5228650456808321,
      "fos_yielding": 2.012448927507899,
      "deflection": 0.004040739517029684,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_1744",
      "improvement_over_parent": null
    },
    "node_1746": {
      "node_id": "node_1746",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1745",
      "improvement_over_parent": null
    },
    "node_1747": {
      "node_id": "node_1747",
      "content": "INITIAL DESIGN (Trace 250)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1748": {
      "node_id": "node_1748",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 268.84 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.8410510953092,
      "fos_buckling": 1.0721042093965394,
      "fos_yielding": 2.287134244823017,
      "deflection": 0.004852848294273609,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1747",
      "improvement_over_parent": null
    },
    "node_1749": {
      "node_id": "node_1749",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2225230561413,
      "fos_buckling": 1.5228696895163494,
      "fos_yielding": 2.012447164286147,
      "deflection": 0.004040726728707249,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1748",
      "improvement_over_parent": null
    },
    "node_1750": {
      "node_id": "node_1750",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1749",
      "improvement_over_parent": null
    },
    "node_1751": {
      "node_id": "node_1751",
      "content": "INITIAL DESIGN (Trace 251)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 204.13 kg\n  Factor of Safety: 0.86\n  Max Deflection: 7.21e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.13336971469727,
      "fos_buckling": 0.8606185684401464,
      "fos_yielding": 1.8634408789974444,
      "deflection": 0.00720835301131849,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1752": {
      "node_id": "node_1752",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 208.38 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.03e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.37757886607426,
      "fos_buckling": 0.9056661155466469,
      "fos_yielding": 1.8634408789974444,
      "deflection": 0.006031983910341002,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002643)"
      },
      "parent_node_id": "node_1751",
      "improvement_over_parent": null
    },
    "node_1753": {
      "node_id": "node_1753",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 255.92 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.93e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.91969514113313,
      "fos_buckling": 1.0725742569058183,
      "fos_yielding": 2.2868279297707153,
      "deflection": 0.004926625698481394,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.250)"
      },
      "parent_node_id": "node_1752",
      "improvement_over_parent": null
    },
    "node_1754": {
      "node_id": "node_1754",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 286.90 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.8982411902095,
      "fos_buckling": 1.465959732367598,
      "fos_yielding": 2.010414898449308,
      "deflection": 0.004109132514064282,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1753",
      "improvement_over_parent": null
    },
    "node_1755": {
      "node_id": "node_1755",
      "content": "MODIFICATION: Increase 2 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.07 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0744133252615,
      "fos_buckling": 1.5223020940878302,
      "fos_yielding": 2.0113188489690783,
      "deflection": 0.004042831565690933,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.344)"
      },
      "parent_node_id": "node_1754",
      "improvement_over_parent": null
    },
    "node_1756": {
      "node_id": "node_1756",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1755",
      "improvement_over_parent": null
    },
    "node_1757": {
      "node_id": "node_1757",
      "content": "INITIAL DESIGN (Trace 252)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 153.77 kg\n  Factor of Safety: 0.69\n  Max Deflection: 8.21e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.77357345982756,
      "fos_buckling": 0.6925406752068873,
      "fos_yielding": 1.3688085197441573,
      "deflection": 0.008211817475192984,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1758": {
      "node_id": "node_1758",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 170.05 kg\n  Factor of Safety: 0.76\n  Max Deflection: 7.43e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.04879484845668,
      "fos_buckling": 0.7568128884127178,
      "fos_yielding": 1.5133228982506717,
      "deflection": 0.007433474590854499,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.112)"
      },
      "parent_node_id": "node_1757",
      "improvement_over_parent": null
    },
    "node_1759": {
      "node_id": "node_1759",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 214.91 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.90e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.91251022749364,
      "fos_buckling": 0.9251760529292927,
      "fos_yielding": 1.911307424605946,
      "deflection": 0.005898293030465151,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.284)"
      },
      "parent_node_id": "node_1758",
      "improvement_over_parent": null
    },
    "node_1760": {
      "node_id": "node_1760",
      "content": "MODIFICATION: Increase 0 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 218.99 kg\n  Factor of Safety: 0.92\n  Max Deflection: 5.79e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.99143833746805,
      "fos_buckling": 0.9249167240624644,
      "fos_yielding": 1.911307424605946,
      "deflection": 0.0057937872354620595,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.181)"
      },
      "parent_node_id": "node_1759",
      "improvement_over_parent": null
    },
    "node_1761": {
      "node_id": "node_1761",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 261.87 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 261.86919912799124,
      "fos_buckling": 1.0713311090437023,
      "fos_yielding": 2.284738299182684,
      "deflection": 0.0048582553520567905,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.215)"
      },
      "parent_node_id": "node_1760",
      "improvement_over_parent": null
    },
    "node_1762": {
      "node_id": "node_1762",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 292.85 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.05e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.8477451770676,
      "fos_buckling": 1.521361145093356,
      "fos_yielding": 2.0094173484073057,
      "deflection": 0.004046065370832966,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1761",
      "improvement_over_parent": null
    },
    "node_1763": {
      "node_id": "node_1763",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1762",
      "improvement_over_parent": null
    },
    "node_1764": {
      "node_id": "node_1764",
      "content": "INITIAL DESIGN (Trace 253)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 161.31 kg\n  Factor of Safety: 0.72\n  Max Deflection: 8.05e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 161.3069757070179,
      "fos_buckling": 0.7186771594571923,
      "fos_yielding": 1.42673621327229,
      "deflection": 0.008051085290370791,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1765": {
      "node_id": "node_1765",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n\nPerformance:\n  Mass: 176.50 kg\n  Factor of Safety: 0.80\n  Max Deflection: 6.89e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.5032157689438,
      "fos_buckling": 0.8022790806219404,
      "fos_yielding": 1.2673308341920644,
      "deflection": 0.006889569748727585,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002925)"
      },
      "parent_node_id": "node_1764",
      "improvement_over_parent": null
    },
    "node_1766": {
      "node_id": "node_1766",
      "content": "MODIFICATION: Increase 0 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n\nPerformance:\n  Mass: 181.58 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.60e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.5846778024841,
      "fos_buckling": 0.8473311576448814,
      "fos_yielding": 1.2657701681630056,
      "deflection": 0.0066003827807404976,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.333)"
      },
      "parent_node_id": "node_1765",
      "improvement_over_parent": null
    },
    "node_1767": {
      "node_id": "node_1767",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n\nPerformance:\n  Mass: 237.65 kg\n  Factor of Safety: 1.09\n  Max Deflection: 5.06e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.6524064695774,
      "fos_buckling": 1.0933544845661174,
      "fos_yielding": 1.6541528021771423,
      "deflection": 0.005057271792933491,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_1766",
      "improvement_over_parent": null
    },
    "node_1768": {
      "node_id": "node_1768",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 291.35 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.35204573525925,
      "fos_buckling": 1.321866727171168,
      "fos_yielding": 2.025030658840956,
      "deflection": 0.004136073313393542,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.248)"
      },
      "parent_node_id": "node_1767",
      "improvement_over_parent": null
    },
    "node_1769": {
      "node_id": "node_1769",
      "content": "MODIFICATION: Increase 5 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0072)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 296.34 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.07e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 296.34194469253856,
      "fos_buckling": 1.2759366001187287,
      "fos_yielding": 2.8198054990629906,
      "deflection": 0.0040743974086656295,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.585)"
      },
      "parent_node_id": "node_1768",
      "improvement_over_parent": null
    },
    "node_1770": {
      "node_id": "node_1770",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1769",
      "improvement_over_parent": null
    },
    "node_1771": {
      "node_id": "node_1771",
      "content": "INITIAL DESIGN (Trace 254)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 226.79 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.39e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.7900939195389,
      "fos_buckling": 0.8464812781893178,
      "fos_yielding": 1.8182437750905538,
      "deflection": 0.0073871727192470205,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1772": {
      "node_id": "node_1772",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 285.49 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.49433552652437,
      "fos_buckling": 1.025566882149313,
      "fos_yielding": 2.2849765676006157,
      "deflection": 0.005880435684770632,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.284)"
      },
      "parent_node_id": "node_1771",
      "improvement_over_parent": null
    },
    "node_1773": {
      "node_id": "node_1773",
      "content": "MODIFICATION: Increase 4 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.01 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.00995266824157,
      "fos_buckling": 1.036635279112097,
      "fos_yielding": 2.295876104206483,
      "deflection": 0.00587945623030882,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.608)"
      },
      "parent_node_id": "node_1772",
      "improvement_over_parent": null
    },
    "node_1774": {
      "node_id": "node_1774",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22378270205564,
      "fos_buckling": 1.5228547856895847,
      "fos_yielding": 2.0124050442100843,
      "deflection": 0.004040701319473485,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_1773",
      "improvement_over_parent": null
    },
    "node_1775": {
      "node_id": "node_1775",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1774",
      "improvement_over_parent": null
    },
    "node_1776": {
      "node_id": "node_1776",
      "content": "INITIAL DESIGN (Trace 255)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 218.34 kg\n  Factor of Safety: 0.96\n  Max Deflection: 5.41e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.33753636451695,
      "fos_buckling": 0.9582121682778878,
      "fos_yielding": 2.250614742552751,
      "deflection": 5414818394735.781,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1777": {
      "node_id": "node_1777",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 244.23 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.64e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.23497350690673,
      "fos_buckling": 0.5886125539787953,
      "fos_yielding": 1.9017397456082759,
      "deflection": 0.007644315479492279,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1776",
      "improvement_over_parent": null
    },
    "node_1778": {
      "node_id": "node_1778",
      "content": "MODIFICATION: Increase 7 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0064)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 250.70 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.61e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.69796029485659,
      "fos_buckling": 0.5883516648665978,
      "fos_yielding": 1.9012909291591755,
      "deflection": 0.007612543652647711,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.235)"
      },
      "parent_node_id": "node_1777",
      "improvement_over_parent": null
    },
    "node_1779": {
      "node_id": "node_1779",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0064)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.90 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.8960182323088,
      "fos_buckling": 1.4813560709331246,
      "fos_yielding": 1.9982939205485657,
      "deflection": 0.004051574382641878,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1778",
      "improvement_over_parent": null
    },
    "node_1780": {
      "node_id": "node_1780",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1779",
      "improvement_over_parent": null
    },
    "node_1781": {
      "node_id": "node_1781",
      "content": "INITIAL DESIGN (Trace 256)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1782": {
      "node_id": "node_1782",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n\nPerformance:\n  Mass: 199.72 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.35e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.72235648203636,
      "fos_buckling": 0.8554817916878086,
      "fos_yielding": 1.7434352942299194,
      "deflection": 0.006345077412917002,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003620)"
      },
      "parent_node_id": "node_1781",
      "improvement_over_parent": null
    },
    "node_1783": {
      "node_id": "node_1783",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 223.01 kg\n  Factor of Safety: 0.94\n  Max Deflection: 5.69e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.0136709501264,
      "fos_buckling": 0.9391412105055822,
      "fos_yielding": 1.9463829694964843,
      "deflection": 0.0056907771844974244,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.126)"
      },
      "parent_node_id": "node_1782",
      "improvement_over_parent": null
    },
    "node_1784": {
      "node_id": "node_1784",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 262.20 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.19993803397057,
      "fos_buckling": 1.0724323501095834,
      "fos_yielding": 2.2876569296854123,
      "deflection": 0.004852261711098756,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.193)"
      },
      "parent_node_id": "node_1783",
      "improvement_over_parent": null
    },
    "node_1785": {
      "node_id": "node_1785",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.18 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.17848408304695,
      "fos_buckling": 1.522704584899603,
      "fos_yielding": 2.012061625094414,
      "deflection": 0.004041376529212083,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1784",
      "improvement_over_parent": null
    },
    "node_1786": {
      "node_id": "node_1786",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1785",
      "improvement_over_parent": null
    },
    "node_1787": {
      "node_id": "node_1787",
      "content": "INITIAL DESIGN (Trace 257)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 252.10 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.10036870031033,
      "fos_buckling": 1.0078613611884708,
      "fos_yielding": 1.5866052266417994,
      "deflection": 0.005881936417689234,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1788": {
      "node_id": "node_1788",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 285.01 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.0129053319273,
      "fos_buckling": 1.0441828570341702,
      "fos_yielding": 1.6153117295456665,
      "deflection": 0.00587803507577859,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1787",
      "improvement_over_parent": null
    },
    "node_1789": {
      "node_id": "node_1789",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 290.23 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.2267353657414,
      "fos_buckling": 1.2217785198313296,
      "fos_yielding": 1.4238867231324877,
      "deflection": 0.004123495621156214,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_1788",
      "improvement_over_parent": null
    },
    "node_1790": {
      "node_id": "node_1790",
      "content": "MODIFICATION: Increase 6 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0091)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 307.92 kg\n  Factor of Safety: 1.22\n  Max Deflection: 3.92e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 307.92238654267214,
      "fos_buckling": 1.2204421833043915,
      "fos_yielding": 1.42232932806664,
      "deflection": 0.003921196429498715,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.473)"
      },
      "parent_node_id": "node_1789",
      "improvement_over_parent": null
    },
    "node_1791": {
      "node_id": "node_1791",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1790",
      "improvement_over_parent": null
    },
    "node_1792": {
      "node_id": "node_1792",
      "content": "INITIAL DESIGN (Trace 258)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 198.53 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.67e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.53049207938443,
      "fos_buckling": 0.8096586666289851,
      "fos_yielding": 1.1910727374201302,
      "deflection": 0.006667593385106434,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1793": {
      "node_id": "node_1793",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n\nPerformance:\n  Mass: 212.86 kg\n  Factor of Safety: 1.05\n  Max Deflection: 5.50e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.86127609295022,
      "fos_buckling": 1.0484763560281274,
      "fos_yielding": 1.1983104288074173,
      "deflection": 0.005504066952026684,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002660)"
      },
      "parent_node_id": "node_1792",
      "improvement_over_parent": null
    },
    "node_1794": {
      "node_id": "node_1794",
      "content": "MODIFICATION: Increase 2 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n\nPerformance:\n  Mass: 218.15 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.42e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.15266300099583,
      "fos_buckling": 1.0379118134017127,
      "fos_yielding": 1.1862361445071294,
      "deflection": 0.0054188816058171494,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.416)"
      },
      "parent_node_id": "node_1793",
      "improvement_over_parent": null
    },
    "node_1795": {
      "node_id": "node_1795",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n\nPerformance:\n  Mass: 255.40 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.64e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.39907987857904,
      "fos_buckling": 1.1968197285026847,
      "fos_yielding": 1.3915959091440164,
      "deflection": 0.00463812045497657,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.185)"
      },
      "parent_node_id": "node_1794",
      "improvement_over_parent": null
    },
    "node_1796": {
      "node_id": "node_1796",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n\nPerformance:\n  Mass: 283.83 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.18e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.82932651947806,
      "fos_buckling": 1.3144797353313238,
      "fos_yielding": 1.549055623474242,
      "deflection": 0.0041800538144154175,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.122)"
      },
      "parent_node_id": "node_1795",
      "improvement_over_parent": null
    },
    "node_1797": {
      "node_id": "node_1797",
      "content": "MODIFICATION: Increase 3 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0054)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n\nPerformance:\n  Mass: 286.31 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.3063303916094,
      "fos_buckling": 1.314805110938677,
      "fos_yielding": 1.5494390640863445,
      "deflection": 0.004147128518415606,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.403)"
      },
      "parent_node_id": "node_1796",
      "improvement_over_parent": null
    },
    "node_1798": {
      "node_id": "node_1798",
      "content": "MODIFICATION: Increase 6 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0054)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0083)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n\nPerformance:\n  Mass: 299.16 kg\n  Factor of Safety: 1.31\n  Max Deflection: 3.98e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 299.1622256608898,
      "fos_buckling": 1.3137452617433347,
      "fos_yielding": 1.548190079174709,
      "deflection": 0.003978514265083553,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.339)"
      },
      "parent_node_id": "node_1797",
      "improvement_over_parent": null
    },
    "node_1799": {
      "node_id": "node_1799",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1798",
      "improvement_over_parent": null
    },
    "node_1800": {
      "node_id": "node_1800",
      "content": "INITIAL DESIGN (Trace 259)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0019)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 157.55 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.39e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.54724556572418,
      "fos_buckling": 0.877241635749294,
      "fos_yielding": 1.1387827434404492,
      "deflection": 0.007385249334886795,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1801": {
      "node_id": "node_1801",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 203.05 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.75e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.04790253663788,
      "fos_buckling": 1.0977285667958747,
      "fos_yielding": 1.4655006661233179,
      "deflection": 0.005745975351071538,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.307)"
      },
      "parent_node_id": "node_1800",
      "improvement_over_parent": null
    },
    "node_1802": {
      "node_id": "node_1802",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 230.28 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.27652973665639,
      "fos_buckling": 1.2227360968800007,
      "fos_yielding": 1.660525132191403,
      "deflection": 0.005074833004195718,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_1801",
      "improvement_over_parent": null
    },
    "node_1803": {
      "node_id": "node_1803",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 283.47 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.4737044667884,
      "fos_buckling": 1.4521082650659314,
      "fos_yielding": 2.0404497112455466,
      "deflection": 0.0041356410475823216,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.253)"
      },
      "parent_node_id": "node_1802",
      "improvement_over_parent": null
    },
    "node_1804": {
      "node_id": "node_1804",
      "content": "MODIFICATION: Increase 9 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.03 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.03093603407905,
      "fos_buckling": 1.5220508729624174,
      "fos_yielding": 2.0112429001767347,
      "deflection": 0.004043255984678843,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.490)"
      },
      "parent_node_id": "node_1803",
      "improvement_over_parent": null
    },
    "node_1805": {
      "node_id": "node_1805",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1804",
      "improvement_over_parent": null
    },
    "node_1806": {
      "node_id": "node_1806",
      "content": "INITIAL DESIGN (Trace 260)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 161.29 kg\n  Factor of Safety: 0.38\n  Max Deflection: 1.13e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 161.2871110286279,
      "fos_buckling": 0.38447453114236413,
      "fos_yielding": 1.3763725854534818,
      "deflection": 11338862546373.762,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1807": {
      "node_id": "node_1807",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 165.45 kg\n  Factor of Safety: 1.27\n  Max Deflection: 2.34e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.4491716875803,
      "fos_buckling": 1.271775175806511,
      "fos_yielding": 3.2627660996805012,
      "deflection": 23408283092849.035,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002588)"
      },
      "parent_node_id": "node_1806",
      "improvement_over_parent": null
    },
    "node_1808": {
      "node_id": "node_1808",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n\nPerformance:\n  Mass: 187.12 kg\n  Factor of Safety: 0.49\n  Max Deflection: 9.54e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.11845487083693,
      "fos_buckling": 0.48872884642054654,
      "fos_yielding": 1.5221566666799902,
      "deflection": 0.009542324658012292,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003431)"
      },
      "parent_node_id": "node_1807",
      "improvement_over_parent": null
    },
    "node_1809": {
      "node_id": "node_1809",
      "content": "MODIFICATION: Increase 0 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n\nPerformance:\n  Mass: 194.97 kg\n  Factor of Safety: 0.49\n  Max Deflection: 9.55e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.9703497931286,
      "fos_buckling": 0.48846471058999175,
      "fos_yielding": 1.521718993747494,
      "deflection": 0.009546459349633952,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.437)"
      },
      "parent_node_id": "node_1808",
      "improvement_over_parent": null
    },
    "node_1810": {
      "node_id": "node_1810",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n\nPerformance:\n  Mass: 229.44 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.11e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.44337973705063,
      "fos_buckling": 1.2315155172458911,
      "fos_yielding": 1.6076990457382543,
      "deflection": 0.005111255358436029,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004826)"
      },
      "parent_node_id": "node_1809",
      "improvement_over_parent": null
    },
    "node_1811": {
      "node_id": "node_1811",
      "content": "MODIFICATION: Increase 8 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0032)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n\nPerformance:\n  Mass: 230.31 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.31475313458319,
      "fos_buckling": 1.2408665431279269,
      "fos_yielding": 1.604183238327011,
      "deflection": 0.00507240970185975,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.229)"
      },
      "parent_node_id": "node_1810",
      "improvement_over_parent": null
    },
    "node_1812": {
      "node_id": "node_1812",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0041)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 288.50 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.50125477132525,
      "fos_buckling": 1.4948559323037909,
      "fos_yielding": 2.006424642404542,
      "deflection": 0.004063959255330598,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.277)"
      },
      "parent_node_id": "node_1811",
      "improvement_over_parent": null
    },
    "node_1813": {
      "node_id": "node_1813",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1812",
      "improvement_over_parent": null
    },
    "node_1814": {
      "node_id": "node_1814",
      "content": "INITIAL DESIGN (Trace 261)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 199.50 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.30e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.49897255908525,
      "fos_buckling": 0.8612382121689315,
      "fos_yielding": 1.345114725762902,
      "deflection": 0.0062961052832572854,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1815": {
      "node_id": "node_1815",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 259.89 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.8911879532701,
      "fos_buckling": 1.0723892782989823,
      "fos_yielding": 1.76147282830477,
      "deflection": 0.004852500761308925,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_1814",
      "improvement_over_parent": null
    },
    "node_1816": {
      "node_id": "node_1816",
      "content": "MODIFICATION: Increase 6 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.18 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.18402275960125,
      "fos_buckling": 1.0723892782989823,
      "fos_yielding": 2.2875531487589504,
      "deflection": 0.004852500761308925,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.328)"
      },
      "parent_node_id": "node_1815",
      "improvement_over_parent": null
    },
    "node_1817": {
      "node_id": "node_1817",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.16256880867763,
      "fos_buckling": 1.5226349449072871,
      "fos_yielding": 2.0119736782629865,
      "deflection": 0.004041586472220695,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_1816",
      "improvement_over_parent": null
    },
    "node_1818": {
      "node_id": "node_1818",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1817",
      "improvement_over_parent": null
    },
    "node_1819": {
      "node_id": "node_1819",
      "content": "INITIAL DESIGN (Trace 262)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 170.28 kg\n  Factor of Safety: 1.25\n  Max Deflection: 1.26e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.2799948536058,
      "fos_buckling": 1.2530930997929663,
      "fos_yielding": 1.5013346206713252,
      "deflection": 12590148261825.582,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1820": {
      "node_id": "node_1820",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 208.55 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.90e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.5497725465092,
      "fos_buckling": 0.8896782008948688,
      "fos_yielding": 1.9640316403680698,
      "deflection": 0.006895562065774457,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005304)"
      },
      "parent_node_id": "node_1819",
      "improvement_over_parent": null
    },
    "node_1821": {
      "node_id": "node_1821",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n\nPerformance:\n  Mass: 230.78 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.64e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.7795118618423,
      "fos_buckling": 0.9461857000710142,
      "fos_yielding": 1.9640316403680704,
      "deflection": 0.005639733619848488,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004243)"
      },
      "parent_node_id": "node_1820",
      "improvement_over_parent": null
    },
    "node_1822": {
      "node_id": "node_1822",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 268.81 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.80600801503346,
      "fos_buckling": 1.0720037119939732,
      "fos_yielding": 2.286830166815956,
      "deflection": 0.004853460043048392,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.181)"
      },
      "parent_node_id": "node_1821",
      "improvement_over_parent": null
    },
    "node_1823": {
      "node_id": "node_1823",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1874799758656,
      "fos_buckling": 1.5227502691358084,
      "fos_yielding": 2.012171435944817,
      "deflection": 0.004041215422538498,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1822",
      "improvement_over_parent": null
    },
    "node_1824": {
      "node_id": "node_1824",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1823",
      "improvement_over_parent": null
    },
    "node_1825": {
      "node_id": "node_1825",
      "content": "INITIAL DESIGN (Trace 263)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0017)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 122.25 kg\n  Factor of Safety: 0.54\n  Max Deflection: 1.04e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 122.24867767013927,
      "fos_buckling": 0.5389273423735338,
      "fos_yielding": 0.9850624929221067,
      "deflection": 0.010412831949555749,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1826": {
      "node_id": "node_1826",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 139.07 kg\n  Factor of Safety: 0.61\n  Max Deflection: 9.16e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 139.06571160206107,
      "fos_buckling": 0.6055584716322896,
      "fos_yielding": 1.1199114118805653,
      "deflection": 0.009163764463609673,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_1825",
      "improvement_over_parent": null
    },
    "node_1827": {
      "node_id": "node_1827",
      "content": "MODIFICATION: Increase 8 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 143.66 kg\n  Factor of Safety: 0.61\n  Max Deflection: 9.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 143.65835154982884,
      "fos_buckling": 0.6053664046112729,
      "fos_yielding": 1.1061721962412652,
      "deflection": 0.009007237990807174,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.385)"
      },
      "parent_node_id": "node_1826",
      "improvement_over_parent": null
    },
    "node_1828": {
      "node_id": "node_1828",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n\nPerformance:\n  Mass: 161.83 kg\n  Factor of Safety: 0.92\n  Max Deflection: 7.27e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 161.82918312277457,
      "fos_buckling": 0.9151304183851543,
      "fos_yielding": 1.1139599490577465,
      "deflection": 0.007265826086630722,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.002850)"
      },
      "parent_node_id": "node_1827",
      "improvement_over_parent": null
    },
    "node_1829": {
      "node_id": "node_1829",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n\nPerformance:\n  Mass: 185.58 kg\n  Factor of Safety: 1.03\n  Max Deflection: 6.34e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.57600827573845,
      "fos_buckling": 1.0338389796185874,
      "fos_yielding": 1.2767375800652285,
      "deflection": 0.006344850784014932,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.155)"
      },
      "parent_node_id": "node_1828",
      "improvement_over_parent": null
    },
    "node_1830": {
      "node_id": "node_1830",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n\nPerformance:\n  Mass: 205.47 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.74e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.46672222253957,
      "fos_buckling": 1.1302387338890891,
      "fos_yielding": 1.4129483984163265,
      "deflection": 0.005737264234883087,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.114)"
      },
      "parent_node_id": "node_1829",
      "improvement_over_parent": null
    },
    "node_1831": {
      "node_id": "node_1831",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n\nPerformance:\n  Mass: 233.02 kg\n  Factor of Safety: 1.26\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.01762648870093,
      "fos_buckling": 1.2592154432135392,
      "fos_yielding": 1.6014140052414556,
      "deflection": 0.005067029869637414,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_1830",
      "improvement_over_parent": null
    },
    "node_1832": {
      "node_id": "node_1832",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.29548221500215,
      "fos_buckling": 1.5230912101699534,
      "fos_yielding": 2.012936881664644,
      "deflection": 0.004039759528896483,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.284)"
      },
      "parent_node_id": "node_1831",
      "improvement_over_parent": null
    },
    "node_1833": {
      "node_id": "node_1833",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1832",
      "improvement_over_parent": null
    },
    "node_1834": {
      "node_id": "node_1834",
      "content": "INITIAL DESIGN (Trace 264)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 216.60 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.57e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.59782083689333,
      "fos_buckling": 1.0204119235322788,
      "fos_yielding": 1.557162372501328,
      "deflection": 0.005569917848511572,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1835": {
      "node_id": "node_1835",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 275.52 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.39e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 275.5166787302032,
      "fos_buckling": 1.2629940754641136,
      "fos_yielding": 1.9764548696028181,
      "deflection": 0.004390973006902381,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.297)"
      },
      "parent_node_id": "node_1834",
      "improvement_over_parent": null
    },
    "node_1836": {
      "node_id": "node_1836",
      "content": "MODIFICATION: Increase 0 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 281.59 kg\n  Factor of Safety: 1.27\n  Max Deflection: 4.27e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.59097268698457,
      "fos_buckling": 1.2650192342490916,
      "fos_yielding": 1.975317266070956,
      "deflection": 0.004270716770046894,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.239)"
      },
      "parent_node_id": "node_1835",
      "improvement_over_parent": null
    },
    "node_1837": {
      "node_id": "node_1837",
      "content": "MODIFICATION: Increase 10 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.17 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.171132646649,
      "fos_buckling": 1.5229157993221816,
      "fos_yielding": 2.0119076967823983,
      "deflection": 0.004041359018931819,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.385)"
      },
      "parent_node_id": "node_1836",
      "improvement_over_parent": null
    },
    "node_1838": {
      "node_id": "node_1838",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1837",
      "improvement_over_parent": null
    },
    "node_1839": {
      "node_id": "node_1839",
      "content": "INITIAL DESIGN (Trace 265)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n\nPerformance:\n  Mass: 149.95 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.15e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.95478918824895,
      "fos_buckling": 0.3971915894875089,
      "fos_yielding": 1.1358069944190143,
      "deflection": 0.011466587305386987,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1840": {
      "node_id": "node_1840",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 171.30 kg\n  Factor of Safety: 0.45\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.302148814775,
      "fos_buckling": 0.4450283311390788,
      "fos_yielding": 1.296221461050745,
      "deflection": 0.01005298088525026,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.153)"
      },
      "parent_node_id": "node_1839",
      "improvement_over_parent": null
    },
    "node_1841": {
      "node_id": "node_1841",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 198.37 kg\n  Factor of Safety: 0.44\n  Max Deflection: 9.20e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.37432073612572,
      "fos_buckling": 0.44419923954509155,
      "fos_yielding": 1.2954708982148369,
      "deflection": 0.009200564245755051,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004352)"
      },
      "parent_node_id": "node_1840",
      "improvement_over_parent": null
    },
    "node_1842": {
      "node_id": "node_1842",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 241.11 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.59e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.11243018026826,
      "fos_buckling": 0.5215412002716944,
      "fos_yielding": 1.5717621974570488,
      "deflection": 0.007590006213774132,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.236)"
      },
      "parent_node_id": "node_1841",
      "improvement_over_parent": null
    },
    "node_1843": {
      "node_id": "node_1843",
      "content": "MODIFICATION: Increase 2 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 248.49 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.53e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.4896288605571,
      "fos_buckling": 0.5212773006327077,
      "fos_yielding": 1.5715145676789386,
      "deflection": 0.0075255652593857495,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.437)"
      },
      "parent_node_id": "node_1842",
      "improvement_over_parent": null
    },
    "node_1844": {
      "node_id": "node_1844",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.07 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.071560028503,
      "fos_buckling": 1.522690350142599,
      "fos_yielding": 2.011110783226767,
      "deflection": 0.004042822128756682,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1843",
      "improvement_over_parent": null
    },
    "node_1845": {
      "node_id": "node_1845",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1844",
      "improvement_over_parent": null
    },
    "node_1846": {
      "node_id": "node_1846",
      "content": "INITIAL DESIGN (Trace 266)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 217.12 kg\n  Factor of Safety: 0.96\n  Max Deflection: 6.48e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.11950545980918,
      "fos_buckling": 0.9582121682778878,
      "fos_yielding": 1.7911069295277282,
      "deflection": 6481600394992.692,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1847": {
      "node_id": "node_1847",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 244.92 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.58e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.92295709178399,
      "fos_buckling": 0.588610286532426,
      "fos_yielding": 1.90159639333083,
      "deflection": 0.007581022608865122,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004479)"
      },
      "parent_node_id": "node_1846",
      "improvement_over_parent": null
    },
    "node_1848": {
      "node_id": "node_1848",
      "content": "MODIFICATION: Increase 7 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0063)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 250.50 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.55e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.49714959377795,
      "fos_buckling": 0.5883852728342637,
      "fos_yielding": 1.9012093442095372,
      "deflection": 0.0075530583849407334,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.202)"
      },
      "parent_node_id": "node_1847",
      "improvement_over_parent": null
    },
    "node_1849": {
      "node_id": "node_1849",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0063)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.70 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.69520753123015,
      "fos_buckling": 1.4871604670597864,
      "fos_yielding": 2.000036877788976,
      "deflection": 0.004049610770384008,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1848",
      "improvement_over_parent": null
    },
    "node_1850": {
      "node_id": "node_1850",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1849",
      "improvement_over_parent": null
    },
    "node_1851": {
      "node_id": "node_1851",
      "content": "INITIAL DESIGN (Trace 267)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 141.29 kg\n  Factor of Safety: 0.60\n  Max Deflection: 9.07e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.29177675572924,
      "fos_buckling": 0.6013841684740228,
      "fos_yielding": 1.0979547687291182,
      "deflection": 0.009072431477942162,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1852": {
      "node_id": "node_1852",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 185.42 kg\n  Factor of Safety: 0.76\n  Max Deflection: 6.94e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.42060937146675,
      "fos_buckling": 0.7641871171722507,
      "fos_yielding": 1.4386927453225684,
      "deflection": 0.0069351228588074,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_1851",
      "improvement_over_parent": null
    },
    "node_1853": {
      "node_id": "node_1853",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 222.88 kg\n  Factor of Safety: 0.89\n  Max Deflection: 5.79e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.88074217946124,
      "fos_buckling": 0.8931965977389285,
      "fos_yielding": 1.7270922286669776,
      "deflection": 0.005785100183251601,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.218)"
      },
      "parent_node_id": "node_1852",
      "improvement_over_parent": null
    },
    "node_1854": {
      "node_id": "node_1854",
      "content": "MODIFICATION: Increase 7 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 230.80 kg\n  Factor of Safety: 0.89\n  Max Deflection: 5.79e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.802032594858,
      "fos_buckling": 0.8927107713815078,
      "fos_yielding": 1.7269123913761777,
      "deflection": 0.005787938819840359,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.418)"
      },
      "parent_node_id": "node_1853",
      "improvement_over_parent": null
    },
    "node_1855": {
      "node_id": "node_1855",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 267.36 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.35874200515025,
      "fos_buckling": 1.00680144992851,
      "fos_yielding": 1.9986688980959286,
      "deflection": 0.005007797211945753,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.174)"
      },
      "parent_node_id": "node_1854",
      "improvement_over_parent": null
    },
    "node_1856": {
      "node_id": "node_1856",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.25617914754,
      "fos_buckling": 1.5231109959685534,
      "fos_yielding": 2.0127929524050203,
      "deflection": 0.004040174000204822,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1855",
      "improvement_over_parent": null
    },
    "node_1857": {
      "node_id": "node_1857",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1856",
      "improvement_over_parent": null
    },
    "node_1858": {
      "node_id": "node_1858",
      "content": "INITIAL DESIGN (Trace 268)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0013)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 179.92 kg\n  Factor of Safety: 0.66\n  Max Deflection: 6.80e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.91729939587879,
      "fos_buckling": 0.655795923278408,
      "fos_yielding": 1.0204399507405684,
      "deflection": 0.006801663654121705,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1859": {
      "node_id": "node_1859",
      "content": "MODIFICATION: Increase 4 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 180.40 kg\n  Factor of Safety: 0.77\n  Max Deflection: 6.73e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.40192842114246,
      "fos_buckling": 0.7666763801134481,
      "fos_yielding": 1.206368641317402,
      "deflection": 0.006728146340153196,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.202)"
      },
      "parent_node_id": "node_1858",
      "improvement_over_parent": null
    },
    "node_1860": {
      "node_id": "node_1860",
      "content": "MODIFICATION: Increase 7 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 189.11 kg\n  Factor of Safety: 0.80\n  Max Deflection: 6.29e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.11220909630273,
      "fos_buckling": 0.8038393259742844,
      "fos_yielding": 1.2648446993627216,
      "deflection": 0.00628925154544906,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.475)"
      },
      "parent_node_id": "node_1859",
      "improvement_over_parent": null
    },
    "node_1861": {
      "node_id": "node_1861",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 227.92 kg\n  Factor of Safety: 0.96\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.92470717696108,
      "fos_buckling": 0.9571379490683322,
      "fos_yielding": 1.5282150886242205,
      "deflection": 0.005229284223694772,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.220)"
      },
      "parent_node_id": "node_1860",
      "improvement_over_parent": null
    },
    "node_1862": {
      "node_id": "node_1862",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 257.99 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.63e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.9871039642877,
      "fos_buckling": 1.0731317786868981,
      "fos_yielding": 1.7333497980416888,
      "deflection": 0.004627442248132511,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.143)"
      },
      "parent_node_id": "node_1861",
      "improvement_over_parent": null
    },
    "node_1863": {
      "node_id": "node_1863",
      "content": "MODIFICATION: Increase 4 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 260.16 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.55e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.1625138040723,
      "fos_buckling": 1.3811580077602665,
      "fos_yielding": 1.7867550649007589,
      "deflection": 0.004545427352768488,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.577)"
      },
      "parent_node_id": "node_1862",
      "improvement_over_parent": null
    },
    "node_1864": {
      "node_id": "node_1864",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.31 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.30954538615794,
      "fos_buckling": 1.5231636437671283,
      "fos_yielding": 2.0129012938774795,
      "deflection": 0.004039501492169839,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.140)"
      },
      "parent_node_id": "node_1863",
      "improvement_over_parent": null
    },
    "node_1865": {
      "node_id": "node_1865",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1864",
      "improvement_over_parent": null
    },
    "node_1866": {
      "node_id": "node_1866",
      "content": "INITIAL DESIGN (Trace 269)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0018)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 133.40 kg\n  Factor of Safety: 0.60\n  Max Deflection: 9.03e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 133.3956666658229,
      "fos_buckling": 0.5967693776983751,
      "fos_yielding": 0.9714247747849613,
      "deflection": 0.009025135420639617,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1867": {
      "node_id": "node_1867",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 157.46 kg\n  Factor of Safety: 0.70\n  Max Deflection: 7.65e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.46333963864024,
      "fos_buckling": 0.6982615611426003,
      "fos_yielding": 1.1457139006375545,
      "deflection": 0.0076544167859399015,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.189)"
      },
      "parent_node_id": "node_1866",
      "improvement_over_parent": null
    },
    "node_1868": {
      "node_id": "node_1868",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 186.49 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.47e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.4914725396377,
      "fos_buckling": 0.8181524648806513,
      "fos_yielding": 1.3555128080385888,
      "deflection": 0.006471818029462588,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.195)"
      },
      "parent_node_id": "node_1867",
      "improvement_over_parent": null
    },
    "node_1869": {
      "node_id": "node_1869",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 213.90 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.65e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.90358391589004,
      "fos_buckling": 0.9288356863904074,
      "fos_yielding": 1.5532111389553027,
      "deflection": 0.005649668976788181,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.157)"
      },
      "parent_node_id": "node_1868",
      "improvement_over_parent": null
    },
    "node_1870": {
      "node_id": "node_1870",
      "content": "MODIFICATION: Increase 7 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 225.61 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.61335092760592,
      "fos_buckling": 1.2251469240054862,
      "fos_yielding": 1.5507799020048547,
      "deflection": 0.005231064435298684,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.582)"
      },
      "parent_node_id": "node_1869",
      "improvement_over_parent": null
    },
    "node_1871": {
      "node_id": "node_1871",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.04 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.03976558345096,
      "fos_buckling": 1.5221160484766223,
      "fos_yielding": 2.0111840674270596,
      "deflection": 0.004043220519276997,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.328)"
      },
      "parent_node_id": "node_1870",
      "improvement_over_parent": null
    },
    "node_1872": {
      "node_id": "node_1872",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1871",
      "improvement_over_parent": null
    },
    "node_1873": {
      "node_id": "node_1873",
      "content": "INITIAL DESIGN (Trace 270)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 176.65 kg\n  Factor of Safety: 0.84\n  Max Deflection: 8.09e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.65023741255357,
      "fos_buckling": 0.8422306501536715,
      "fos_yielding": 1.2794262117356692,
      "deflection": 0.00808589603588185,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1874": {
      "node_id": "node_1874",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n\nPerformance:\n  Mass: 193.30 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.68e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.29979770774835,
      "fos_buckling": 0.8412656154129552,
      "fos_yielding": 1.1162063536603883,
      "deflection": 0.006684769273026496,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003222)"
      },
      "parent_node_id": "node_1873",
      "improvement_over_parent": null
    },
    "node_1875": {
      "node_id": "node_1875",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n\nPerformance:\n  Mass: 219.74 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.57e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.73588565938013,
      "fos_buckling": 0.9862036040462465,
      "fos_yielding": 1.122482348843965,
      "deflection": 0.0055736954964455375,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004242)"
      },
      "parent_node_id": "node_1874",
      "improvement_over_parent": null
    },
    "node_1876": {
      "node_id": "node_1876",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 273.87 kg\n  Factor of Safety: 1.21\n  Max Deflection: 4.48e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 273.87439496957256,
      "fos_buckling": 1.2051469935765255,
      "fos_yielding": 1.404875813045915,
      "deflection": 0.0044815035337520265,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.269)"
      },
      "parent_node_id": "node_1875",
      "improvement_over_parent": null
    },
    "node_1877": {
      "node_id": "node_1877",
      "content": "MODIFICATION: Increase 6 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0091)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 291.39 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.27e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.39471577580474,
      "fos_buckling": 1.2039406951123683,
      "fos_yielding": 1.4034695949292524,
      "deflection": 0.004271017703688009,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.468)"
      },
      "parent_node_id": "node_1876",
      "improvement_over_parent": null
    },
    "node_1878": {
      "node_id": "node_1878",
      "content": "MODIFICATION: Increase 3 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0091)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 292.24 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.25e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.2392588466853,
      "fos_buckling": 1.2041843350999188,
      "fos_yielding": 1.4037536133331687,
      "deflection": 0.004245533719588334,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.189)"
      },
      "parent_node_id": "node_1877",
      "improvement_over_parent": null
    },
    "node_1879": {
      "node_id": "node_1879",
      "content": "MODIFICATION: Increase 4 thickness by 51%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0050)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0091)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 294.55 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.19e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.5465517373357,
      "fos_buckling": 1.200200214631837,
      "fos_yielding": 1.399109205213908,
      "deflection": 0.004192525623242669,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.513)"
      },
      "parent_node_id": "node_1878",
      "improvement_over_parent": null
    },
    "node_1880": {
      "node_id": "node_1880",
      "content": "MODIFICATION: Increase 1 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0050)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0091)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 305.11 kg\n  Factor of Safety: 1.22\n  Max Deflection: 3.94e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 305.1113622645193,
      "fos_buckling": 1.2241142235690858,
      "fos_yielding": 1.4269864790468711,
      "deflection": 0.003935553148403648,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.473)"
      },
      "parent_node_id": "node_1879",
      "improvement_over_parent": null
    },
    "node_1881": {
      "node_id": "node_1881",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1880",
      "improvement_over_parent": null
    },
    "node_1882": {
      "node_id": "node_1882",
      "content": "INITIAL DESIGN (Trace 271)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 149.77 kg\n  Factor of Safety: 1.22\n  Max Deflection: 8.48e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.76867933663436,
      "fos_buckling": 1.2237418801638273,
      "fos_yielding": 1.7716277089088355,
      "deflection": 8481211882966.63,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1883": {
      "node_id": "node_1883",
      "content": "MODIFICATION: Increase 1 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 157.59 kg\n  Factor of Safety: 1.04\n  Max Deflection: 7.45e+12 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.58732752179222,
      "fos_buckling": 1.0408568086284444,
      "fos_yielding": 1.7716277089088355,
      "deflection": 7453484374078.557,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.433)"
      },
      "parent_node_id": "node_1882",
      "improvement_over_parent": null
    },
    "node_1884": {
      "node_id": "node_1884",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 181.56 kg\n  Factor of Safety: 0.29\n  Max Deflection: 1.15e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.55577598988606,
      "fos_buckling": 0.2862557025918752,
      "fos_yielding": 1.1116979891001038,
      "deflection": 0.011504447636266613,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003953)"
      },
      "parent_node_id": "node_1883",
      "improvement_over_parent": null
    },
    "node_1885": {
      "node_id": "node_1885",
      "content": "MODIFICATION: Increase 2 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 184.42 kg\n  Factor of Safety: 0.29\n  Max Deflection: 1.15e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.42397984775965,
      "fos_buckling": 0.2861991444587477,
      "fos_yielding": 1.1025623211313162,
      "deflection": 0.011475616850234217,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.179)"
      },
      "parent_node_id": "node_1884",
      "improvement_over_parent": null
    },
    "node_1886": {
      "node_id": "node_1886",
      "content": "MODIFICATION: Increase 3 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 191.07 kg\n  Factor of Safety: 0.42\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 191.069835789612,
      "fos_buckling": 0.4217036056335981,
      "fos_yielding": 1.1020385913810407,
      "deflection": 0.010122304071251063,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.582)"
      },
      "parent_node_id": "node_1885",
      "improvement_over_parent": null
    },
    "node_1887": {
      "node_id": "node_1887",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 225.56 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.31e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.55983243373447,
      "fos_buckling": 1.074840429820853,
      "fos_yielding": 1.5683828722085162,
      "deflection": 0.005313723523117608,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004742)"
      },
      "parent_node_id": "node_1886",
      "improvement_over_parent": null
    },
    "node_1888": {
      "node_id": "node_1888",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 291.55 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.5522442407098,
      "fos_buckling": 1.3635845578572294,
      "fos_yielding": 2.023745507507514,
      "deflection": 0.004124628059015103,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.321)"
      },
      "parent_node_id": "node_1887",
      "improvement_over_parent": null
    },
    "node_1889": {
      "node_id": "node_1889",
      "content": "MODIFICATION: Increase 5 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22269010021375,
      "fos_buckling": 1.5225902486352072,
      "fos_yielding": 2.012176846390872,
      "deflection": 0.004040671393116422,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.517)"
      },
      "parent_node_id": "node_1888",
      "improvement_over_parent": null
    },
    "node_1890": {
      "node_id": "node_1890",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1889",
      "improvement_over_parent": null
    },
    "node_1891": {
      "node_id": "node_1891",
      "content": "INITIAL DESIGN (Trace 272)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 145.64 kg\n  Factor of Safety: 0.70\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 145.64382877166088,
      "fos_buckling": 0.7011258265454267,
      "fos_yielding": 1.2739665408611993,
      "deflection": 0.010053827134388554,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1892": {
      "node_id": "node_1892",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 165.78 kg\n  Factor of Safety: 0.70\n  Max Deflection: 8.71e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.77696903380303,
      "fos_buckling": 0.7001524393819494,
      "fos_yielding": 1.119686828600197,
      "deflection": 0.008706472727031943,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003283)"
      },
      "parent_node_id": "node_1891",
      "improvement_over_parent": null
    },
    "node_1893": {
      "node_id": "node_1893",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 200.49 kg\n  Factor of Safety: 0.82\n  Max Deflection: 7.21e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.48960683218277,
      "fos_buckling": 0.8249947826927971,
      "fos_yielding": 1.3549665891979916,
      "deflection": 0.007206244234672486,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_1892",
      "improvement_over_parent": null
    },
    "node_1894": {
      "node_id": "node_1894",
      "content": "MODIFICATION: Increase 0 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 208.90 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.40e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.89938461502967,
      "fos_buckling": 0.824517729547832,
      "fos_yielding": 1.3548167169938627,
      "deflection": 0.006396607378627669,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.493)"
      },
      "parent_node_id": "node_1893",
      "improvement_over_parent": null
    },
    "node_1895": {
      "node_id": "node_1895",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 229.24 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.17e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.23651016301483,
      "fos_buckling": 1.175804249822485,
      "fos_yielding": 1.3644534132453496,
      "deflection": 0.005165660395316742,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003855)"
      },
      "parent_node_id": "node_1894",
      "improvement_over_parent": null
    },
    "node_1896": {
      "node_id": "node_1896",
      "content": "MODIFICATION: Increase 6 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0056)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 234.79 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.04e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.78947513942796,
      "fos_buckling": 1.1752340079304935,
      "fos_yielding": 1.3637916802264216,
      "deflection": 0.005044549274018333,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.178)"
      },
      "parent_node_id": "node_1895",
      "improvement_over_parent": null
    },
    "node_1897": {
      "node_id": "node_1897",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0073)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 298.78 kg\n  Factor of Safety: 1.45\n  Max Deflection: 3.98e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 298.77814916385296,
      "fos_buckling": 1.4513891831850134,
      "fos_yielding": 1.7396671930368652,
      "deflection": 0.00397831533087575,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.300)"
      },
      "parent_node_id": "node_1896",
      "improvement_over_parent": null
    },
    "node_1898": {
      "node_id": "node_1898",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1897",
      "improvement_over_parent": null
    },
    "node_1899": {
      "node_id": "node_1899",
      "content": "INITIAL DESIGN (Trace 273)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 216.46 kg\n  Factor of Safety: 0.92\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.45764015679362,
      "fos_buckling": 0.9178926533622548,
      "fos_yielding": 1.893348158209976,
      "deflection": 0.005939175296948659,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1900": {
      "node_id": "node_1900",
      "content": "MODIFICATION: Increase 7 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 222.45 kg\n  Factor of Safety: 0.92\n  Max Deflection: 5.85e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.4506024106471,
      "fos_buckling": 0.9175147263179522,
      "fos_yielding": 1.893348158209976,
      "deflection": 0.005847801605750473,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.304)"
      },
      "parent_node_id": "node_1899",
      "improvement_over_parent": null
    },
    "node_1901": {
      "node_id": "node_1901",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.84 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.8380081403548,
      "fos_buckling": 1.0721146803770965,
      "fos_yielding": 2.2871605700204207,
      "deflection": 0.004852862480215319,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.229)"
      },
      "parent_node_id": "node_1900",
      "improvement_over_parent": null
    },
    "node_1902": {
      "node_id": "node_1902",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.21948010118695,
      "fos_buckling": 1.5228959469413015,
      "fos_yielding": 2.01246618765801,
      "deflection": 0.004040732949722692,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1901",
      "improvement_over_parent": null
    },
    "node_1903": {
      "node_id": "node_1903",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1902",
      "improvement_over_parent": null
    },
    "node_1904": {
      "node_id": "node_1904",
      "content": "INITIAL DESIGN (Trace 274)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 185.79 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.49e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.79230115211402,
      "fos_buckling": 0.8779218746417962,
      "fos_yielding": 1.3795520244073114,
      "deflection": 0.006485978309405215,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1905": {
      "node_id": "node_1905",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 232.80 kg\n  Factor of Safety: 1.08\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.79561115721737,
      "fos_buckling": 1.0786875716789912,
      "fos_yielding": 1.724961104635172,
      "deflection": 0.005188210541010099,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_1904",
      "improvement_over_parent": null
    },
    "node_1906": {
      "node_id": "node_1906",
      "content": "MODIFICATION: Increase 0 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 238.29 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.2923507386928,
      "fos_buckling": 1.0385389070303146,
      "fos_yielding": 1.7240288017605314,
      "deflection": 0.005066117629991755,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.252)"
      },
      "parent_node_id": "node_1905",
      "improvement_over_parent": null
    },
    "node_1907": {
      "node_id": "node_1907",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 278.80 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.34e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 278.7954270298715,
      "fos_buckling": 1.1957055328292672,
      "fos_yielding": 2.0140552763999526,
      "deflection": 0.004338330696826703,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.186)"
      },
      "parent_node_id": "node_1906",
      "improvement_over_parent": null
    },
    "node_1908": {
      "node_id": "node_1908",
      "content": "MODIFICATION: Increase 7 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.06 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0573406480669,
      "fos_buckling": 1.5220730351987142,
      "fos_yielding": 2.0110924025227597,
      "deflection": 0.004042889252040729,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.541)"
      },
      "parent_node_id": "node_1907",
      "improvement_over_parent": null
    },
    "node_1909": {
      "node_id": "node_1909",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1908",
      "improvement_over_parent": null
    },
    "node_1910": {
      "node_id": "node_1910",
      "content": "INITIAL DESIGN (Trace 275)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 138.51 kg\n  Factor of Safety: 0.79\n  Max Deflection: 8.48e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 138.5140576050094,
      "fos_buckling": 0.7947806141213312,
      "fos_yielding": 0.9539638042334234,
      "deflection": 0.008477271128338296,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1911": {
      "node_id": "node_1911",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 157.97 kg\n  Factor of Safety: 0.90\n  Max Deflection: 7.44e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.96594706899654,
      "fos_buckling": 0.8954993053245875,
      "fos_yielding": 1.087453309901757,
      "deflection": 0.0074418311323982975,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.147)"
      },
      "parent_node_id": "node_1910",
      "improvement_over_parent": null
    },
    "node_1912": {
      "node_id": "node_1912",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 183.71 kg\n  Factor of Safety: 1.02\n  Max Deflection: 6.41e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.7052556141752,
      "fos_buckling": 1.0246922236631215,
      "fos_yielding": 1.263910284602288,
      "deflection": 0.00640875509079923,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.172)"
      },
      "parent_node_id": "node_1911",
      "improvement_over_parent": null
    },
    "node_1913": {
      "node_id": "node_1913",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 236.19 kg\n  Factor of Safety: 1.27\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.19073630290836,
      "fos_buckling": 1.273807078878979,
      "fos_yielding": 1.6230920480461144,
      "deflection": 0.00499987118364181,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.307)"
      },
      "parent_node_id": "node_1912",
      "improvement_over_parent": null
    },
    "node_1914": {
      "node_id": "node_1914",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.99 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.9874470137269,
      "fos_buckling": 1.521894070930164,
      "fos_yielding": 2.0108207622889056,
      "deflection": 0.004043928657499203,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.264)"
      },
      "parent_node_id": "node_1913",
      "improvement_over_parent": null
    },
    "node_1915": {
      "node_id": "node_1915",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1914",
      "improvement_over_parent": null
    },
    "node_1916": {
      "node_id": "node_1916",
      "content": "INITIAL DESIGN (Trace 276)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 162.83 kg\n  Factor of Safety: 0.73\n  Max Deflection: 7.86e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.83204162656838,
      "fos_buckling": 0.7252745275746223,
      "fos_yielding": 1.3420383176219806,
      "deflection": 0.00785764914373237,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1917": {
      "node_id": "node_1917",
      "content": "MODIFICATION: Increase 8 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 167.58 kg\n  Factor of Safety: 0.73\n  Max Deflection: 7.72e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 167.58232805116953,
      "fos_buckling": 0.7250369784672381,
      "fos_yielding": 1.3277496531111483,
      "deflection": 0.007721339844925249,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.311)"
      },
      "parent_node_id": "node_1916",
      "improvement_over_parent": null
    },
    "node_1918": {
      "node_id": "node_1918",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 192.05 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.75e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 192.04517980236963,
      "fos_buckling": 0.8153419116933224,
      "fos_yielding": 1.5203648974614108,
      "deflection": 0.006747567786193277,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.156)"
      },
      "parent_node_id": "node_1917",
      "improvement_over_parent": null
    },
    "node_1919": {
      "node_id": "node_1919",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 217.55 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.57e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.54576661083877,
      "fos_buckling": 1.1207453866352155,
      "fos_yielding": 1.529450425912315,
      "deflection": 0.005569709579838124,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004081)"
      },
      "parent_node_id": "node_1918",
      "improvement_over_parent": null
    },
    "node_1920": {
      "node_id": "node_1920",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n\nPerformance:\n  Mass: 243.55 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.98e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.54558535597303,
      "fos_buckling": 1.2394226085281517,
      "fos_yielding": 1.7109877637807616,
      "deflection": 0.004981138552769065,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.129)"
      },
      "parent_node_id": "node_1919",
      "improvement_over_parent": null
    },
    "node_1921": {
      "node_id": "node_1921",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 281.36 kg\n  Factor of Safety: 1.41\n  Max Deflection: 4.32e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.3561274250341,
      "fos_buckling": 1.4061813493573194,
      "fos_yielding": 1.9745001676083247,
      "deflection": 0.004319247676688431,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_1920",
      "improvement_over_parent": null
    },
    "node_1922": {
      "node_id": "node_1922",
      "content": "MODIFICATION: Increase 4 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 282.81 kg\n  Factor of Safety: 1.50\n  Max Deflection: 4.28e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.8066680128271,
      "fos_buckling": 1.499829093180878,
      "fos_yielding": 1.9749822394968708,
      "deflection": 0.004283820480624484,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.284)"
      },
      "parent_node_id": "node_1921",
      "improvement_over_parent": null
    },
    "node_1923": {
      "node_id": "node_1923",
      "content": "MODIFICATION: Increase 1 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.50 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.501404776807,
      "fos_buckling": 1.5241467992677091,
      "fos_yielding": 2.014213431468368,
      "deflection": 0.004037113533644233,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.481)"
      },
      "parent_node_id": "node_1922",
      "improvement_over_parent": null
    },
    "node_1924": {
      "node_id": "node_1924",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1923",
      "improvement_over_parent": null
    },
    "node_1925": {
      "node_id": "node_1925",
      "content": "INITIAL DESIGN (Trace 277)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 162.34 kg\n  Factor of Safety: 0.78\n  Max Deflection: 8.03e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.33989746024668,
      "fos_buckling": 0.7776613561769791,
      "fos_yielding": 1.559406868700148,
      "deflection": 0.0080322503647056,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1926": {
      "node_id": "node_1926",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 183.44 kg\n  Factor of Safety: 0.80\n  Max Deflection: 6.74e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.43767688894442,
      "fos_buckling": 0.8016760416307813,
      "fos_yielding": 1.3701135350651747,
      "deflection": 0.006744499147349451,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003450)"
      },
      "parent_node_id": "node_1925",
      "improvement_over_parent": null
    },
    "node_1927": {
      "node_id": "node_1927",
      "content": "MODIFICATION: Increase 7 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 193.67 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.25e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.66593131454798,
      "fos_buckling": 0.9512069556022907,
      "fos_yielding": 1.3672931261877113,
      "deflection": 0.006245188472389737,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.565)"
      },
      "parent_node_id": "node_1926",
      "improvement_over_parent": null
    },
    "node_1928": {
      "node_id": "node_1928",
      "content": "MODIFICATION: Increase 1 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 197.77 kg\n  Factor of Safety: 0.99\n  Max Deflection: 6.06e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.76758521618345,
      "fos_buckling": 0.9883690271410184,
      "fos_yielding": 1.3806473725554653,
      "deflection": 0.0060597720960388355,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.220)"
      },
      "parent_node_id": "node_1927",
      "improvement_over_parent": null
    },
    "node_1929": {
      "node_id": "node_1929",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 233.30 kg\n  Factor of Safety: 1.15\n  Max Deflection: 5.15e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.30475057918935,
      "fos_buckling": 1.1536257019000502,
      "fos_yielding": 1.6271692841579228,
      "deflection": 0.005145945404241812,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.193)"
      },
      "parent_node_id": "node_1928",
      "improvement_over_parent": null
    },
    "node_1930": {
      "node_id": "node_1930",
      "content": "MODIFICATION: Increase 5 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 234.59 kg\n  Factor of Safety: 1.20\n  Max Deflection: 5.05e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.59383650512498,
      "fos_buckling": 1.1965766369822737,
      "fos_yielding": 1.6185091177117907,
      "deflection": 0.005048919934504,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.477)"
      },
      "parent_node_id": "node_1929",
      "improvement_over_parent": null
    },
    "node_1931": {
      "node_id": "node_1931",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 291.67 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.07e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.6726909684967,
      "fos_buckling": 1.447331033433461,
      "fos_yielding": 2.00957129105436,
      "deflection": 0.0040740530885112845,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.267)"
      },
      "parent_node_id": "node_1930",
      "improvement_over_parent": null
    },
    "node_1932": {
      "node_id": "node_1932",
      "content": "MODIFICATION: Increase 4 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 292.88 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.05e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.8780539124165,
      "fos_buckling": 1.5213912626383608,
      "fos_yielding": 2.0100041539431666,
      "deflection": 0.004045328376348257,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.227)"
      },
      "parent_node_id": "node_1931",
      "improvement_over_parent": null
    },
    "node_1933": {
      "node_id": "node_1933",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1932",
      "improvement_over_parent": null
    },
    "node_1934": {
      "node_id": "node_1934",
      "content": "INITIAL DESIGN (Trace 278)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 191.90 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.88e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 191.89626865878103,
      "fos_buckling": 0.5003323649725301,
      "fos_yielding": 1.5639254046074087,
      "deflection": 0.00888288478854686,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1935": {
      "node_id": "node_1935",
      "content": "MODIFICATION: Increase 3 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 197.79 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.83e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.78660511565624,
      "fos_buckling": 0.5001295465937082,
      "fos_yielding": 1.5635882427969958,
      "deflection": 0.008825709581203774,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.449)"
      },
      "parent_node_id": "node_1934",
      "improvement_over_parent": null
    },
    "node_1936": {
      "node_id": "node_1936",
      "content": "MODIFICATION: Increase 8 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 205.16 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.75e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.15594835076627,
      "fos_buckling": 0.4998760339013055,
      "fos_yielding": 1.563166627558176,
      "deflection": 0.00874519991416731,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.439)"
      },
      "parent_node_id": "node_1935",
      "improvement_over_parent": null
    },
    "node_1937": {
      "node_id": "node_1937",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 240.60 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.91e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.59692325400312,
      "fos_buckling": 1.293866448138206,
      "fos_yielding": 1.6531391575792984,
      "deflection": 0.004909640531354006,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004972)"
      },
      "parent_node_id": "node_1936",
      "improvement_over_parent": null
    },
    "node_1938": {
      "node_id": "node_1938",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.40 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3973807071078,
      "fos_buckling": 1.5236247871465114,
      "fos_yielding": 2.0135345599686016,
      "deflection": 0.0040384372450815035,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.241)"
      },
      "parent_node_id": "node_1937",
      "improvement_over_parent": null
    },
    "node_1939": {
      "node_id": "node_1939",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1938",
      "improvement_over_parent": null
    },
    "node_1940": {
      "node_id": "node_1940",
      "content": "INITIAL DESIGN (Trace 279)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 169.16 kg\n  Factor of Safety: 0.63\n  Max Deflection: 7.92e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.16428088154962,
      "fos_buckling": 0.6331653067688685,
      "fos_yielding": 1.480147128630655,
      "deflection": 0.007923188018269118,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1941": {
      "node_id": "node_1941",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 204.57 kg\n  Factor of Safety: 0.75\n  Max Deflection: 6.56e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.57201416926011,
      "fos_buckling": 0.7507387533450889,
      "fos_yielding": 1.7887764927063068,
      "deflection": 0.006563269224192662,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_1940",
      "improvement_over_parent": null
    },
    "node_1942": {
      "node_id": "node_1942",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 236.65 kg\n  Factor of Safety: 0.85\n  Max Deflection: 5.68e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.64837187356784,
      "fos_buckling": 0.8528036614846778,
      "fos_yielding": 2.0679874021142313,
      "deflection": 0.0056824953572931535,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_1941",
      "improvement_over_parent": null
    },
    "node_1943": {
      "node_id": "node_1943",
      "content": "MODIFICATION: Increase 9 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 243.05 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.36e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.0490890804267,
      "fos_buckling": 0.9881159335465771,
      "fos_yielding": 2.0679874021142313,
      "deflection": 0.005358668376366512,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.205)"
      },
      "parent_node_id": "node_1942",
      "improvement_over_parent": null
    },
    "node_1944": {
      "node_id": "node_1944",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.92 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.92413741632583,
      "fos_buckling": 1.0728207864489636,
      "fos_yielding": 2.2875882654717716,
      "deflection": 0.00485093254138395,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.117)"
      },
      "parent_node_id": "node_1943",
      "improvement_over_parent": null
    },
    "node_1945": {
      "node_id": "node_1945",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.31 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3056093771579,
      "fos_buckling": 1.5236747462907225,
      "fos_yielding": 2.0129244609837733,
      "deflection": 0.004039527606942942,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1944",
      "improvement_over_parent": null
    },
    "node_1946": {
      "node_id": "node_1946",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1945",
      "improvement_over_parent": null
    },
    "node_1947": {
      "node_id": "node_1947",
      "content": "INITIAL DESIGN (Trace 280)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 175.04 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.08e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.0448992532933,
      "fos_buckling": 0.3856064295962068,
      "fos_yielding": 1.4147130634651752,
      "deflection": 0.010812236133179578,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1948": {
      "node_id": "node_1948",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 204.59 kg\n  Factor of Safety: 0.38\n  Max Deflection: 9.38e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.5909677381389,
      "fos_buckling": 0.38482268151142746,
      "fos_yielding": 1.413819135221919,
      "deflection": 0.00938111156476151,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004784)"
      },
      "parent_node_id": "node_1947",
      "improvement_over_parent": null
    },
    "node_1949": {
      "node_id": "node_1949",
      "content": "MODIFICATION: Increase 7 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 218.33 kg\n  Factor of Safety: 0.38\n  Max Deflection: 8.98e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.3261587610619,
      "fos_buckling": 0.384459421378549,
      "fos_yielding": 1.4134039560090697,
      "deflection": 0.00898157739496283,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.595)"
      },
      "parent_node_id": "node_1948",
      "improvement_over_parent": null
    },
    "node_1950": {
      "node_id": "node_1950",
      "content": "MODIFICATION: Increase 3 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 223.20 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.37e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.20085027041705,
      "fos_buckling": 0.4775722307588061,
      "fos_yielding": 1.4129621760912643,
      "deflection": 0.008365833702788423,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.311)"
      },
      "parent_node_id": "node_1949",
      "improvement_over_parent": null
    },
    "node_1951": {
      "node_id": "node_1951",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 248.59 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.59060921730205,
      "fos_buckling": 0.5214169102724509,
      "fos_yielding": 1.5724277893565877,
      "deflection": 0.0075221534701829336,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.125)"
      },
      "parent_node_id": "node_1950",
      "improvement_over_parent": null
    },
    "node_1952": {
      "node_id": "node_1952",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.17 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.17254038524794,
      "fos_buckling": 1.5228223965534797,
      "fos_yielding": 2.0122285359984855,
      "deflection": 0.004041409676888853,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1951",
      "improvement_over_parent": null
    },
    "node_1953": {
      "node_id": "node_1953",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1952",
      "improvement_over_parent": null
    },
    "node_1954": {
      "node_id": "node_1954",
      "content": "INITIAL DESIGN (Trace 281)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1955": {
      "node_id": "node_1955",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 182.98 kg\n  Factor of Safety: 0.17\n  Max Deflection: 7.88e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.9818098438779,
      "fos_buckling": 0.1743098281360827,
      "fos_yielding": 0.14066342140954693,
      "deflection": 78787802989327.62,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_1954",
      "improvement_over_parent": null
    },
    "node_1956": {
      "node_id": "node_1956",
      "content": "MODIFICATION: Increase 0 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 190.35 kg\n  Factor of Safety: 1.01\n  Max Deflection: 1.17e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.34864378445985,
      "fos_buckling": 1.0144423468130468,
      "fos_yielding": 1.199379108076434,
      "deflection": 11720465252269.734,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.304)"
      },
      "parent_node_id": "node_1955",
      "improvement_over_parent": null
    },
    "node_1957": {
      "node_id": "node_1957",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 233.55 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.93e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.5467017219121,
      "fos_buckling": 1.0088725709744517,
      "fos_yielding": 1.7421138524005695,
      "deflection": 0.0059286882661721075,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_1956",
      "improvement_over_parent": null
    },
    "node_1958": {
      "node_id": "node_1958",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 257.93 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.92817368274416,
      "fos_buckling": 1.0071867813427182,
      "fos_yielding": 1.5357444329233412,
      "deflection": 0.005071733064210768,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_1957",
      "improvement_over_parent": null
    },
    "node_1959": {
      "node_id": "node_1959",
      "content": "MODIFICATION: Increase 6 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0070)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 267.28 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.2832828093508,
      "fos_buckling": 1.0065414427149968,
      "fos_yielding": 1.5220180121423788,
      "deflection": 0.0050134487237376065,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.344)"
      },
      "parent_node_id": "node_1958",
      "improvement_over_parent": null
    },
    "node_1960": {
      "node_id": "node_1960",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0070)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 300.20 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 300.1958194409678,
      "fos_buckling": 1.301473035522444,
      "fos_yielding": 1.5331933960884727,
      "deflection": 0.004048734700993789,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1959",
      "improvement_over_parent": null
    },
    "node_1961": {
      "node_id": "node_1961",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1960",
      "improvement_over_parent": null
    },
    "node_1962": {
      "node_id": "node_1962",
      "content": "INITIAL DESIGN (Trace 282)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 137.32 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.24e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 137.31520391235637,
      "fos_buckling": 0.3966176280378088,
      "fos_yielding": 1.1982741861038497,
      "deflection": 0.01243374018552493,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1963": {
      "node_id": "node_1963",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 174.28 kg\n  Factor of Safety: 0.49\n  Max Deflection: 9.82e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.28271980940372,
      "fos_buckling": 0.48786075255521105,
      "fos_yielding": 1.5176820475306403,
      "deflection": 0.00981855112823593,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.289)"
      },
      "parent_node_id": "node_1962",
      "improvement_over_parent": null
    },
    "node_1964": {
      "node_id": "node_1964",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n\nPerformance:\n  Mass: 193.37 kg\n  Factor of Safety: 0.49\n  Max Deflection: 9.08e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.36967935936153,
      "fos_buckling": 0.4872197430009344,
      "fos_yielding": 1.5166215311031075,
      "deflection": 0.00907635853583456,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003103)"
      },
      "parent_node_id": "node_1963",
      "improvement_over_parent": null
    },
    "node_1965": {
      "node_id": "node_1965",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n\nPerformance:\n  Mass: 227.71 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.70977126665602,
      "fos_buckling": 1.2206271752952533,
      "fos_yielding": 1.6189258080978193,
      "deflection": 0.00514035790252339,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004806)"
      },
      "parent_node_id": "node_1964",
      "improvement_over_parent": null
    },
    "node_1966": {
      "node_id": "node_1966",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 286.73 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.7286561228923,
      "fos_buckling": 1.4773000883540537,
      "fos_yielding": 2.034745000000696,
      "deflection": 0.004096830412050931,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.284)"
      },
      "parent_node_id": "node_1965",
      "improvement_over_parent": null
    },
    "node_1967": {
      "node_id": "node_1967",
      "content": "MODIFICATION: Increase 9 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.59 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.5909083248215,
      "fos_buckling": 1.5245137175615875,
      "fos_yielding": 2.0153320680544846,
      "deflection": 0.004035712906126461,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.312)"
      },
      "parent_node_id": "node_1966",
      "improvement_over_parent": null
    },
    "node_1968": {
      "node_id": "node_1968",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1967",
      "improvement_over_parent": null
    },
    "node_1969": {
      "node_id": "node_1969",
      "content": "INITIAL DESIGN (Trace 283)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 171.48 kg\n  Factor of Safety: 0.72\n  Max Deflection: 7.47e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.48316106862274,
      "fos_buckling": 0.7159875827151051,
      "fos_yielding": 1.3352786774780576,
      "deflection": 0.007468310174920962,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1970": {
      "node_id": "node_1970",
      "content": "MODIFICATION: Increase 7 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 178.24 kg\n  Factor of Safety: 0.72\n  Max Deflection: 7.47e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.24056384362515,
      "fos_buckling": 0.7156542145139402,
      "fos_yielding": 1.335159916827712,
      "deflection": 0.007471446226869072,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.471)"
      },
      "parent_node_id": "node_1969",
      "improvement_over_parent": null
    },
    "node_1971": {
      "node_id": "node_1971",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 217.18 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.15e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.1840460002513,
      "fos_buckling": 0.8482341703357676,
      "fos_yielding": 1.6253457948250383,
      "deflection": 0.006146488805185789,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.235)"
      },
      "parent_node_id": "node_1970",
      "improvement_over_parent": null
    },
    "node_1972": {
      "node_id": "node_1972",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 267.62 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.61625703386443,
      "fos_buckling": 1.0074745153357634,
      "fos_yielding": 2.000329073688273,
      "deflection": 0.005003690984136154,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.255)"
      },
      "parent_node_id": "node_1971",
      "improvement_over_parent": null
    },
    "node_1973": {
      "node_id": "node_1973",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.51 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.5136941762542,
      "fos_buckling": 1.5241299138309108,
      "fos_yielding": 2.014466333987639,
      "deflection": 0.004036773687588125,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_1972",
      "improvement_over_parent": null
    },
    "node_1974": {
      "node_id": "node_1974",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1973",
      "improvement_over_parent": null
    },
    "node_1975": {
      "node_id": "node_1975",
      "content": "INITIAL DESIGN (Trace 284)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0019)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 126.33 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.38e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 126.33041564072536,
      "fos_buckling": 0.33697738245500825,
      "fos_yielding": 1.0007264022532303,
      "deflection": 0.013778119732435755,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1976": {
      "node_id": "node_1976",
      "content": "MODIFICATION: Increase 8 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 130.80 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.37e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 130.7951676362808,
      "fos_buckling": 0.33687338848035536,
      "fos_yielding": 1.000562256465383,
      "deflection": 0.013658626724590554,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.397)"
      },
      "parent_node_id": "node_1975",
      "improvement_over_parent": null
    },
    "node_1977": {
      "node_id": "node_1977",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 145.85 kg\n  Factor of Safety: 0.37\n  Max Deflection: 1.23e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 145.84939547428328,
      "fos_buckling": 0.3715233046433533,
      "fos_yielding": 1.11481303757705,
      "deflection": 0.012259518748642064,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.121)"
      },
      "parent_node_id": "node_1976",
      "improvement_over_parent": null
    },
    "node_1978": {
      "node_id": "node_1978",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 190.17 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.43e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.17059791008913,
      "fos_buckling": 0.4686557167139577,
      "fos_yielding": 1.4500978159304287,
      "deflection": 0.009426478860034171,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.325)"
      },
      "parent_node_id": "node_1977",
      "improvement_over_parent": null
    },
    "node_1979": {
      "node_id": "node_1979",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 226.74 kg\n  Factor of Safety: 0.54\n  Max Deflection: 7.92e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.74351039113526,
      "fos_buckling": 0.5433548827922535,
      "fos_yielding": 1.7255583787178863,
      "deflection": 0.007922746224250179,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.209)"
      },
      "parent_node_id": "node_1978",
      "improvement_over_parent": null
    },
    "node_1980": {
      "node_id": "node_1980",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n\nPerformance:\n  Mass: 265.90 kg\n  Factor of Safety: 1.41\n  Max Deflection: 4.45e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.89531485653174,
      "fos_buckling": 1.4064349343296152,
      "fos_yielding": 1.8259465908747439,
      "deflection": 0.004449151332127027,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005538)"
      },
      "parent_node_id": "node_1979",
      "improvement_over_parent": null
    },
    "node_1981": {
      "node_id": "node_1981",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.47 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4743785442632,
      "fos_buckling": 1.5240382033151456,
      "fos_yielding": 2.0140849484656878,
      "deflection": 0.004037491551399569,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.114)"
      },
      "parent_node_id": "node_1980",
      "improvement_over_parent": null
    },
    "node_1982": {
      "node_id": "node_1982",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1981",
      "improvement_over_parent": null
    },
    "node_1983": {
      "node_id": "node_1983",
      "content": "INITIAL DESIGN (Trace 285)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1984": {
      "node_id": "node_1984",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 178.57 kg\n  Factor of Safety: 0.03\n  Max Deflection: 1.91e+14 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.5675697176375,
      "fos_buckling": 0.029017463893699445,
      "fos_yielding": 0.14325723340284563,
      "deflection": 190902455650894.22,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004798)"
      },
      "parent_node_id": "node_1983",
      "improvement_over_parent": null
    },
    "node_1985": {
      "node_id": "node_1985",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n\nPerformance:\n  Mass: 196.18 kg\n  Factor of Safety: 0.49\n  Max Deflection: 1.47e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.18355127099608,
      "fos_buckling": 0.4877284702214629,
      "fos_yielding": 1.1253073712763755,
      "deflection": 14726046594604.912,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003307)"
      },
      "parent_node_id": "node_1984",
      "improvement_over_parent": null
    },
    "node_1986": {
      "node_id": "node_1986",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 218.13 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.40e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.13231688384025,
      "fos_buckling": 0.4789495451569067,
      "fos_yielding": 1.41695537394362,
      "deflection": 0.008401678349267847,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004335)"
      },
      "parent_node_id": "node_1985",
      "improvement_over_parent": null
    },
    "node_1987": {
      "node_id": "node_1987",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 258.26 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.56e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.26091397430025,
      "fos_buckling": 1.334756118644821,
      "fos_yielding": 1.8119383975444592,
      "deflection": 0.004556929279531903,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005584)"
      },
      "parent_node_id": "node_1986",
      "improvement_over_parent": null
    },
    "node_1988": {
      "node_id": "node_1988",
      "content": "MODIFICATION: Increase 2 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0046)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 260.25 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.52e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.24635455116845,
      "fos_buckling": 1.2911510345029569,
      "fos_yielding": 1.812354134736449,
      "deflection": 0.004523007500519708,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.351)"
      },
      "parent_node_id": "node_1987",
      "improvement_over_parent": null
    },
    "node_1989": {
      "node_id": "node_1989",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0052)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 289.16 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.1553789224292,
      "fos_buckling": 1.415666734260857,
      "fos_yielding": 2.012240828474374,
      "deflection": 0.0040775030607470555,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.122)"
      },
      "parent_node_id": "node_1988",
      "improvement_over_parent": null
    },
    "node_1990": {
      "node_id": "node_1990",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1989",
      "improvement_over_parent": null
    },
    "node_1991": {
      "node_id": "node_1991",
      "content": "INITIAL DESIGN (Trace 286)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 186.59 kg\n  Factor of Safety: 0.64\n  Max Deflection: 8.44e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.58556119016467,
      "fos_buckling": 0.642909904352943,
      "fos_yielding": 1.753620905693607,
      "deflection": 0.00843585973671528,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1992": {
      "node_id": "node_1992",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 190.61 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.80e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.60511108805358,
      "fos_buckling": 0.8121683006620329,
      "fos_yielding": 1.5114762738743048,
      "deflection": 0.006797144430323438,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002493)"
      },
      "parent_node_id": "node_1991",
      "improvement_over_parent": null
    },
    "node_1993": {
      "node_id": "node_1993",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 220.74 kg\n  Factor of Safety: 0.92\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.74440786670544,
      "fos_buckling": 0.9185544180012865,
      "fos_yielding": 1.7487198510452286,
      "deflection": 0.005879464991519681,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_1992",
      "improvement_over_parent": null
    },
    "node_1994": {
      "node_id": "node_1994",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 247.57 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.25e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.57092110101456,
      "fos_buckling": 1.008286416166561,
      "fos_yielding": 1.959466403164881,
      "deflection": 0.005250592392783314,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.133)"
      },
      "parent_node_id": "node_1993",
      "improvement_over_parent": null
    },
    "node_1995": {
      "node_id": "node_1995",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 280.48 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.30e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 280.48345773263156,
      "fos_buckling": 1.2358464221374077,
      "fos_yielding": 1.9714527474049075,
      "deflection": 0.00430082475279885,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_1994",
      "improvement_over_parent": null
    },
    "node_1996": {
      "node_id": "node_1996",
      "content": "MODIFICATION: Increase 10 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0078)]\n\nPerformance:\n  Mass: 293.15 kg\n  Factor of Safety: 1.23\n  Max Deflection: 4.22e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.15091805244896,
      "fos_buckling": 1.2323675473497955,
      "fos_yielding": 1.9721985652128247,
      "deflection": 0.00422380909036568,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.443)"
      },
      "parent_node_id": "node_1995",
      "improvement_over_parent": null
    },
    "node_1997": {
      "node_id": "node_1997",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_1996",
      "improvement_over_parent": null
    },
    "node_1998": {
      "node_id": "node_1998",
      "content": "INITIAL DESIGN (Trace 287)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0013)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0007)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 157.37 kg\n  Factor of Safety: 0.58\n  Max Deflection: 7.84e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.37361280281274,
      "fos_buckling": 0.5756449055908514,
      "fos_yielding": 1.1017088644712898,
      "deflection": 0.007841660502103992,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_1999": {
      "node_id": "node_1999",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0010)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 203.85 kg\n  Factor of Safety: 0.74\n  Max Deflection: 6.06e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.85473574778902,
      "fos_buckling": 0.7422346529020515,
      "fos_yielding": 1.4303108066791992,
      "deflection": 0.006064660428114591,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.314)"
      },
      "parent_node_id": "node_1998",
      "improvement_over_parent": null
    },
    "node_2000": {
      "node_id": "node_2000",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0011)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 228.55 kg\n  Factor of Safety: 0.83\n  Max Deflection: 5.41e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.55210297401797,
      "fos_buckling": 0.8301110729420735,
      "fos_yielding": 1.6056804876839492,
      "deflection": 0.005414448151536978,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.130)"
      },
      "parent_node_id": "node_1999",
      "improvement_over_parent": null
    },
    "node_2001": {
      "node_id": "node_2001",
      "content": "MODIFICATION: Increase 5 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 229.33 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.29e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.32528144775466,
      "fos_buckling": 0.9893013469707408,
      "fos_yielding": 1.5824441445567612,
      "deflection": 0.005287487672184783,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.441)"
      },
      "parent_node_id": "node_2000",
      "improvement_over_parent": null
    },
    "node_2002": {
      "node_id": "node_2002",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 254.52 kg\n  Factor of Safety: 1.09\n  Max Deflection: 4.77e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.5197747141343,
      "fos_buckling": 1.0888978528999897,
      "fos_yielding": 1.7589788986224288,
      "deflection": 0.0047695973830807715,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.119)"
      },
      "parent_node_id": "node_2001",
      "improvement_over_parent": null
    },
    "node_2003": {
      "node_id": "node_2003",
      "content": "MODIFICATION: Increase 4 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 256.64 kg\n  Factor of Safety: 1.15\n  Max Deflection: 4.69e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.642150466879,
      "fos_buckling": 1.1499245963342999,
      "fos_yielding": 1.78697174009392,
      "deflection": 0.00469454326374394,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.562)"
      },
      "parent_node_id": "node_2002",
      "improvement_over_parent": null
    },
    "node_2004": {
      "node_id": "node_2004",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 291.46 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.45971926685104,
      "fos_buckling": 1.2948750388268098,
      "fos_yielding": 2.027507082336633,
      "deflection": 0.004140712979687455,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.149)"
      },
      "parent_node_id": "node_2003",
      "improvement_over_parent": null
    },
    "node_2005": {
      "node_id": "node_2005",
      "content": "MODIFICATION: Increase 5 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.37 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.37085184409216,
      "fos_buckling": 1.5234806800869654,
      "fos_yielding": 2.0134401740506935,
      "deflection": 0.004038748789271515,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.634)"
      },
      "parent_node_id": "node_2004",
      "improvement_over_parent": null
    },
    "node_2006": {
      "node_id": "node_2006",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2005",
      "improvement_over_parent": null
    },
    "node_2007": {
      "node_id": "node_2007",
      "content": "INITIAL DESIGN (Trace 288)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 182.80 kg\n  Factor of Safety: 1.04\n  Max Deflection: 6.52e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.79795209400137,
      "fos_buckling": 1.0418698170469716,
      "fos_yielding": 1.2921192283447613,
      "deflection": 0.006519168241337024,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2008": {
      "node_id": "node_2008",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 233.68 kg\n  Factor of Safety: 1.29\n  Max Deflection: 5.11e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.6824226913184,
      "fos_buckling": 1.2876151643359566,
      "fos_yielding": 1.6492523706977558,
      "deflection": 0.005113397256229478,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_2007",
      "improvement_over_parent": null
    },
    "node_2009": {
      "node_id": "node_2009",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 285.94 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.19e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 285.9358991084403,
      "fos_buckling": 1.5202723483862304,
      "fos_yielding": 2.014791148259617,
      "deflection": 0.004190437492371925,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.245)"
      },
      "parent_node_id": "node_2008",
      "improvement_over_parent": null
    },
    "node_2010": {
      "node_id": "node_2010",
      "content": "MODIFICATION: Increase 0 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.32 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3237479518187,
      "fos_buckling": 1.5233629204566526,
      "fos_yielding": 2.01323385234222,
      "deflection": 0.004039426408721504,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.305)"
      },
      "parent_node_id": "node_2009",
      "improvement_over_parent": null
    },
    "node_2011": {
      "node_id": "node_2011",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2010",
      "improvement_over_parent": null
    },
    "node_2012": {
      "node_id": "node_2012",
      "content": "INITIAL DESIGN (Trace 289)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 199.86 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.44e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.86323895914092,
      "fos_buckling": 0.5235658740149824,
      "fos_yielding": 1.7647992772610146,
      "deflection": 0.008439791737702476,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2013": {
      "node_id": "node_2013",
      "content": "MODIFICATION: Increase 6 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 207.29 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.44e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.29209823317865,
      "fos_buckling": 0.5232982815290204,
      "fos_yielding": 1.7638972952005623,
      "deflection": 0.008440632824428435,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.376)"
      },
      "parent_node_id": "node_2012",
      "improvement_over_parent": null
    },
    "node_2014": {
      "node_id": "node_2014",
      "content": "MODIFICATION: Increase 8 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 212.03 kg\n  Factor of Safety: 0.64\n  Max Deflection: 7.76e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.02690947754263,
      "fos_buckling": 0.6376873739742913,
      "fos_yielding": 2.003918962615338,
      "deflection": 0.007757998948717986,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.252)"
      },
      "parent_node_id": "node_2013",
      "improvement_over_parent": null
    },
    "node_2015": {
      "node_id": "node_2015",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 216.59 kg\n  Factor of Safety: 0.64\n  Max Deflection: 6.59e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.59267236473713,
      "fos_buckling": 0.6372871367250423,
      "fos_yielding": 2.003918962615338,
      "deflection": 0.00659124258148289,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002860)"
      },
      "parent_node_id": "node_2014",
      "improvement_over_parent": null
    },
    "node_2016": {
      "node_id": "node_2016",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n\nPerformance:\n  Mass: 237.94 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.94382161291398,
      "fos_buckling": 0.9881731704006074,
      "fos_yielding": 1.7237428551331277,
      "deflection": 0.00510217691232228,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004207)"
      },
      "parent_node_id": "node_2015",
      "improvement_over_parent": null
    },
    "node_2017": {
      "node_id": "node_2017",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 271.93 kg\n  Factor of Safety: 1.12\n  Max Deflection: 4.47e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 271.92672871503487,
      "fos_buckling": 1.1155533186281394,
      "fos_yielding": 1.9674578050140274,
      "deflection": 0.0044709614136314085,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.156)"
      },
      "parent_node_id": "node_2016",
      "improvement_over_parent": null
    },
    "node_2018": {
      "node_id": "node_2018",
      "content": "MODIFICATION: Increase 10 thickness by 65%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0080)]\n\nPerformance:\n  Mass: 285.34 kg\n  Factor of Safety: 1.17\n  Max Deflection: 4.37e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.34037550645223,
      "fos_buckling": 1.1676128667597665,
      "fos_yielding": 1.9435793564409043,
      "deflection": 0.00436701465828914,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.647)"
      },
      "parent_node_id": "node_2017",
      "improvement_over_parent": null
    },
    "node_2019": {
      "node_id": "node_2019",
      "content": "MODIFICATION: Increase 9 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0040)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0080)]\n\nPerformance:\n  Mass: 286.26 kg\n  Factor of Safety: 1.18\n  Max Deflection: 4.33e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.2603297260796,
      "fos_buckling": 1.1771304362369939,
      "fos_yielding": 1.9397632296839091,
      "deflection": 0.004331433247953792,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.198)"
      },
      "parent_node_id": "node_2018",
      "improvement_over_parent": null
    },
    "node_2020": {
      "node_id": "node_2020",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2019",
      "improvement_over_parent": null
    },
    "node_2021": {
      "node_id": "node_2021",
      "content": "INITIAL DESIGN (Trace 290)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 239.67 kg\n  Factor of Safety: 0.94\n  Max Deflection: 5.13e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.66991969642842,
      "fos_buckling": 0.9439649150070814,
      "fos_yielding": 1.7674802293870162,
      "deflection": 0.005134336864970242,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2022": {
      "node_id": "node_2022",
      "content": "MODIFICATION: Increase 7 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 246.93 kg\n  Factor of Safety: 1.13\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.93015087707496,
      "fos_buckling": 1.1331924699995777,
      "fos_yielding": 1.7653818951709879,
      "deflection": 0.004850927245470867,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.370)"
      },
      "parent_node_id": "node_2021",
      "improvement_over_parent": null
    },
    "node_2023": {
      "node_id": "node_2023",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.11 kg\n  Factor of Safety: 1.27\n  Max Deflection: 4.25e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.10598484380887,
      "fos_buckling": 1.2739851842472956,
      "fos_yielding": 2.014398480587427,
      "deflection": 0.004253653681065363,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.156)"
      },
      "parent_node_id": "node_2022",
      "improvement_over_parent": null
    },
    "node_2024": {
      "node_id": "node_2024",
      "content": "MODIFICATION: Increase 7 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.19341021518096,
      "fos_buckling": 1.5227659494954968,
      "fos_yielding": 2.0122476314961464,
      "deflection": 0.004041141565883721,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.379)"
      },
      "parent_node_id": "node_2023",
      "improvement_over_parent": null
    },
    "node_2025": {
      "node_id": "node_2025",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2024",
      "improvement_over_parent": null
    },
    "node_2026": {
      "node_id": "node_2026",
      "content": "INITIAL DESIGN (Trace 291)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 208.66 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.34e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.65532942315758,
      "fos_buckling": 0.8256308669191906,
      "fos_yielding": 1.5745810558987006,
      "deflection": 0.006343026468364943,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2027": {
      "node_id": "node_2027",
      "content": "MODIFICATION: Increase 3 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 210.35 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.34e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.35396700877396,
      "fos_buckling": 0.8256308669191906,
      "fos_yielding": 1.5745810558987006,
      "deflection": 0.006343026468364943,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.473)"
      },
      "parent_node_id": "node_2026",
      "improvement_over_parent": null
    },
    "node_2028": {
      "node_id": "node_2028",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 267.27 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.2668227422722,
      "fos_buckling": 1.0064655618580165,
      "fos_yielding": 1.9978452517485947,
      "deflection": 0.005009844755265495,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.297)"
      },
      "parent_node_id": "node_2027",
      "improvement_over_parent": null
    },
    "node_2029": {
      "node_id": "node_2029",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.164259884662,
      "fos_buckling": 1.522589623750033,
      "fos_yielding": 2.0119678661299463,
      "deflection": 0.004041532603440221,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2028",
      "improvement_over_parent": null
    },
    "node_2030": {
      "node_id": "node_2030",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2029",
      "improvement_over_parent": null
    },
    "node_2031": {
      "node_id": "node_2031",
      "content": "INITIAL DESIGN (Trace 292)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 173.48 kg\n  Factor of Safety: 0.14\n  Max Deflection: 8.65e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.48228256170833,
      "fos_buckling": 0.13516005360944064,
      "fos_yielding": 0.4177547370306841,
      "deflection": 86507152004516.84,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2032": {
      "node_id": "node_2032",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 206.39 kg\n  Factor of Safety: 0.34\n  Max Deflection: 2.13e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.39481919332533,
      "fos_buckling": 0.33671355013030924,
      "fos_yielding": 1.7976972289698163,
      "deflection": 21313880441713.918,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2031",
      "improvement_over_parent": null
    },
    "node_2033": {
      "node_id": "node_2033",
      "content": "MODIFICATION: Increase 2 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 215.21 kg\n  Factor of Safety: 0.25\n  Max Deflection: 3.65e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.20583741792356,
      "fos_buckling": 0.25469320475315704,
      "fos_yielding": 0.8153326857265426,
      "deflection": 36468353958612.36,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.565)"
      },
      "parent_node_id": "node_2032",
      "improvement_over_parent": null
    },
    "node_2034": {
      "node_id": "node_2034",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 239.59 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.58730937875566,
      "fos_buckling": 0.5219041387300258,
      "fos_yielding": 1.572925884366536,
      "deflection": 0.007516760396855519,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2033",
      "improvement_over_parent": null
    },
    "node_2035": {
      "node_id": "node_2035",
      "content": "MODIFICATION: Increase 1 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 248.66 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.66062643189468,
      "fos_buckling": 0.5215793427260554,
      "fos_yielding": 1.5726210972940573,
      "deflection": 0.007520398384009898,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.383)"
      },
      "parent_node_id": "node_2034",
      "improvement_over_parent": null
    },
    "node_2036": {
      "node_id": "node_2036",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.24255759984055,
      "fos_buckling": 1.5228888207218099,
      "fos_yielding": 2.0124501057547524,
      "deflection": 0.0040405414170036,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2035",
      "improvement_over_parent": null
    },
    "node_2037": {
      "node_id": "node_2037",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2036",
      "improvement_over_parent": null
    },
    "node_2038": {
      "node_id": "node_2038",
      "content": "INITIAL DESIGN (Trace 293)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0018)]\n\nPerformance:\n  Mass: 115.18 kg\n  Factor of Safety: 0.55\n  Max Deflection: 2.18e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 115.17563946675587,
      "fos_buckling": 0.5498135470041737,
      "fos_yielding": 0.5626536856381877,
      "deflection": 21768925519565.484,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2039": {
      "node_id": "node_2039",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0018)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 140.16 kg\n  Factor of Safety: 0.65\n  Max Deflection: 8.85e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 140.15705499721983,
      "fos_buckling": 0.6539275631069218,
      "fos_yielding": 1.2835476841018587,
      "deflection": 0.008854577184796824,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003369)"
      },
      "parent_node_id": "node_2038",
      "improvement_over_parent": null
    },
    "node_2040": {
      "node_id": "node_2040",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 179.33 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.94e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.33262039663484,
      "fos_buckling": 0.8123895176888427,
      "fos_yielding": 1.6410124081878492,
      "deflection": 0.006938084536487268,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.297)"
      },
      "parent_node_id": "node_2039",
      "improvement_over_parent": null
    },
    "node_2041": {
      "node_id": "node_2041",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 211.31 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.90e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.31475201861107,
      "fos_buckling": 0.9340049779720729,
      "fos_yielding": 1.9323802387759612,
      "deflection": 0.005900384947027277,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_2040",
      "improvement_over_parent": null
    },
    "node_2042": {
      "node_id": "node_2042",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 237.47 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.93e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.4730039553521,
      "fos_buckling": 1.2413632119247755,
      "fos_yielding": 1.6992872309028255,
      "deflection": 0.004927620971699671,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004343)"
      },
      "parent_node_id": "node_2041",
      "improvement_over_parent": null
    },
    "node_2043": {
      "node_id": "node_2043",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 281.28 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.17e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.27688869055845,
      "fos_buckling": 1.427218662693454,
      "fos_yielding": 2.009828998007147,
      "deflection": 0.004170910747195014,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.202)"
      },
      "parent_node_id": "node_2042",
      "improvement_over_parent": null
    },
    "node_2044": {
      "node_id": "node_2044",
      "content": "MODIFICATION: Increase 8 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.07 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.06662001494976,
      "fos_buckling": 1.5222143017644238,
      "fos_yielding": 2.0115041680305072,
      "deflection": 0.004042764056760293,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.613)"
      },
      "parent_node_id": "node_2043",
      "improvement_over_parent": null
    },
    "node_2045": {
      "node_id": "node_2045",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2044",
      "improvement_over_parent": null
    },
    "node_2046": {
      "node_id": "node_2046",
      "content": "INITIAL DESIGN (Trace 294)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0021)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0027)]\n\nPerformance:\n  Mass: 126.71 kg\n  Factor of Safety: 0.53\n  Max Deflection: 1.07e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 126.70692079120548,
      "fos_buckling": 0.5314739695814251,
      "fos_yielding": 1.3783760740648223,
      "deflection": 0.010664633761931963,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2047": {
      "node_id": "node_2047",
      "content": "MODIFICATION: Increase 8 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0021)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 133.63 kg\n  Factor of Safety: 0.66\n  Max Deflection: 9.77e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 133.62737027167628,
      "fos_buckling": 0.6552001436644832,
      "fos_yielding": 1.3783760740648223,
      "deflection": 0.009772550132813203,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.366)"
      },
      "parent_node_id": "node_2046",
      "improvement_over_parent": null
    },
    "node_2048": {
      "node_id": "node_2048",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0021)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n\nPerformance:\n  Mass: 153.44 kg\n  Factor of Safety: 0.70\n  Max Deflection: 8.16e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.43868495333533,
      "fos_buckling": 0.6967355479810157,
      "fos_yielding": 1.3783760740648223,
      "deflection": 0.008157009523971954,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003121)"
      },
      "parent_node_id": "node_2047",
      "improvement_over_parent": null
    },
    "node_2049": {
      "node_id": "node_2049",
      "content": "MODIFICATION: Increase 2 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n\nPerformance:\n  Mass: 157.84 kg\n  Factor of Safety: 0.70\n  Max Deflection: 8.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.83783783626157,
      "fos_buckling": 0.6965240705862737,
      "fos_yielding": 1.3783760740648223,
      "deflection": 0.008007800560394483,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.414)"
      },
      "parent_node_id": "node_2048",
      "improvement_over_parent": null
    },
    "node_2050": {
      "node_id": "node_2050",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n\nPerformance:\n  Mass: 176.49 kg\n  Factor of Safety: 0.99\n  Max Deflection: 6.67e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.48691383075223,
      "fos_buckling": 0.9887798873132838,
      "fos_yielding": 1.2144698460003651,
      "deflection": 0.006668132964964415,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003028)"
      },
      "parent_node_id": "node_2049",
      "improvement_over_parent": null
    },
    "node_2051": {
      "node_id": "node_2051",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 208.32 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.66e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.32200186643595,
      "fos_buckling": 1.1437535810927968,
      "fos_yielding": 1.4325081188727704,
      "deflection": 0.005659615654314998,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_2050",
      "improvement_over_parent": null
    },
    "node_2052": {
      "node_id": "node_2052",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 260.39 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.54e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.39268094066483,
      "fos_buckling": 1.3820559626314797,
      "fos_yielding": 1.78846492500717,
      "deflection": 0.004541583506870547,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.271)"
      },
      "parent_node_id": "node_2051",
      "improvement_over_parent": null
    },
    "node_2053": {
      "node_id": "node_2053",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.33 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3315730152515,
      "fos_buckling": 1.523137623227377,
      "fos_yielding": 2.013204825187639,
      "deflection": 0.004039302931622921,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.139)"
      },
      "parent_node_id": "node_2052",
      "improvement_over_parent": null
    },
    "node_2054": {
      "node_id": "node_2054",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2053",
      "improvement_over_parent": null
    },
    "node_2055": {
      "node_id": "node_2055",
      "content": "INITIAL DESIGN (Trace 295)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0021)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n\nPerformance:\n  Mass: 108.24 kg\n  Factor of Safety: 0.32\n  Max Deflection: 1.97e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 108.23556582269694,
      "fos_buckling": 0.3166183373519006,
      "fos_yielding": 0.7462728214467229,
      "deflection": 0.01970442751962679,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2056": {
      "node_id": "node_2056",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 122.21 kg\n  Factor of Safety: 0.35\n  Max Deflection: 1.75e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 122.20874323963467,
      "fos_buckling": 0.35279739606126725,
      "fos_yielding": 0.8421599509905624,
      "deflection": 0.017469746352700335,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.136)"
      },
      "parent_node_id": "node_2055",
      "improvement_over_parent": null
    },
    "node_2057": {
      "node_id": "node_2057",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 149.46 kg\n  Factor of Safety: 0.42\n  Max Deflection: 1.43e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.45629526738495,
      "fos_buckling": 0.4202959341049904,
      "fos_yielding": 1.0288196339335338,
      "deflection": 0.014314294421082868,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.238)"
      },
      "parent_node_id": "node_2056",
      "improvement_over_parent": null
    },
    "node_2058": {
      "node_id": "node_2058",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 183.72 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.69e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.72231988263255,
      "fos_buckling": 0.47307381168408436,
      "fos_yielding": 1.4653972363804737,
      "deflection": 0.009694558698021827,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004709)"
      },
      "parent_node_id": "node_2057",
      "improvement_over_parent": null
    },
    "node_2059": {
      "node_id": "node_2059",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 239.15 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.47e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.14919058095506,
      "fos_buckling": 0.5885730314078833,
      "fos_yielding": 1.9002284298919387,
      "deflection": 0.007470959514105354,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.330)"
      },
      "parent_node_id": "node_2058",
      "improvement_over_parent": null
    },
    "node_2060": {
      "node_id": "node_2060",
      "content": "MODIFICATION: Increase 1 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 249.91 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.20e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.91445680247807,
      "fos_buckling": 0.588138479722528,
      "fos_yielding": 1.899481732312293,
      "deflection": 0.007197591135261982,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.486)"
      },
      "parent_node_id": "node_2059",
      "improvement_over_parent": null
    },
    "node_2061": {
      "node_id": "node_2061",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.11 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1125147399303,
      "fos_buckling": 1.5223852558290465,
      "fos_yielding": 2.0113846096598365,
      "deflection": 0.004042116090295344,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2060",
      "improvement_over_parent": null
    },
    "node_2062": {
      "node_id": "node_2062",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2061",
      "improvement_over_parent": null
    },
    "node_2063": {
      "node_id": "node_2063",
      "content": "INITIAL DESIGN (Trace 296)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 220.91 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.44e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.91347334189678,
      "fos_buckling": 0.950229455730857,
      "fos_yielding": 1.5192768878078529,
      "deflection": 0.005436985017306012,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2064": {
      "node_id": "node_2064",
      "content": "MODIFICATION: Increase 4 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 222.73 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.34e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.7253326136125,
      "fos_buckling": 1.2311215067620418,
      "fos_yielding": 1.5634697426666118,
      "deflection": 0.00534212490542442,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.531)"
      },
      "parent_node_id": "node_2063",
      "improvement_over_parent": null
    },
    "node_2065": {
      "node_id": "node_2065",
      "content": "MODIFICATION: Increase 0 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 227.33 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.3299637408625,
      "fos_buckling": 1.233121483320697,
      "fos_yielding": 1.562560873041234,
      "deflection": 0.005192110779843566,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.227)"
      },
      "parent_node_id": "node_2064",
      "improvement_over_parent": null
    },
    "node_2066": {
      "node_id": "node_2066",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.19092375119595,
      "fos_buckling": 1.5227739740947581,
      "fos_yielding": 2.0122675264695786,
      "deflection": 0.004041193391037812,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.318)"
      },
      "parent_node_id": "node_2065",
      "improvement_over_parent": null
    },
    "node_2067": {
      "node_id": "node_2067",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2066",
      "improvement_over_parent": null
    },
    "node_2068": {
      "node_id": "node_2068",
      "content": "INITIAL DESIGN (Trace 297)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 168.13 kg\n  Factor of Safety: 0.74\n  Max Deflection: 9.54e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.13316940472012,
      "fos_buckling": 0.7387768520492067,
      "fos_yielding": 1.5611170877432023,
      "deflection": 0.009542280458560539,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2069": {
      "node_id": "node_2069",
      "content": "MODIFICATION: Increase 1 thickness by 51%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 175.92 kg\n  Factor of Safety: 0.74\n  Max Deflection: 8.59e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.92373290459287,
      "fos_buckling": 0.7391783943264328,
      "fos_yielding": 1.5611170877432023,
      "deflection": 0.008589732070257084,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.513)"
      },
      "parent_node_id": "node_2068",
      "improvement_over_parent": null
    },
    "node_2070": {
      "node_id": "node_2070",
      "content": "MODIFICATION: Increase 7 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 179.76 kg\n  Factor of Safety: 0.74\n  Max Deflection: 8.59e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.75579885258497,
      "fos_buckling": 0.7393760673885614,
      "fos_yielding": 1.5607451764477458,
      "deflection": 0.008589696387351313,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.235)"
      },
      "parent_node_id": "node_2069",
      "improvement_over_parent": null
    },
    "node_2071": {
      "node_id": "node_2071",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n\nPerformance:\n  Mass: 183.31 kg\n  Factor of Safety: 0.78\n  Max Deflection: 7.08e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.31099329362556,
      "fos_buckling": 0.7773078474054359,
      "fos_yielding": 1.5607451764477458,
      "deflection": 0.007080210180312079,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002187)"
      },
      "parent_node_id": "node_2070",
      "improvement_over_parent": null
    },
    "node_2072": {
      "node_id": "node_2072",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n\nPerformance:\n  Mass: 199.94 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.89e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.93622374751843,
      "fos_buckling": 1.103975738327602,
      "fos_yielding": 1.3750024071863967,
      "deflection": 0.0058943553568862085,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003217)"
      },
      "parent_node_id": "node_2071",
      "improvement_over_parent": null
    },
    "node_2073": {
      "node_id": "node_2073",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n\nPerformance:\n  Mass: 224.96 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.25e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.9552051768502,
      "fos_buckling": 1.2223068200422822,
      "fos_yielding": 1.546190372942813,
      "deflection": 0.0052464282399690525,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.134)"
      },
      "parent_node_id": "node_2072",
      "improvement_over_parent": null
    },
    "node_2074": {
      "node_id": "node_2074",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.21 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2070069167681,
      "fos_buckling": 1.5230735457227826,
      "fos_yielding": 2.0122108965951746,
      "deflection": 0.004041148345693256,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.333)"
      },
      "parent_node_id": "node_2073",
      "improvement_over_parent": null
    },
    "node_2075": {
      "node_id": "node_2075",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2074",
      "improvement_over_parent": null
    },
    "node_2076": {
      "node_id": "node_2076",
      "content": "INITIAL DESIGN (Trace 298)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0021)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 141.32 kg\n  Factor of Safety: 0.64\n  Max Deflection: 9.93e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.3185171073055,
      "fos_buckling": 0.6386695509670974,
      "fos_yielding": 1.1613063198985962,
      "deflection": 0.009929986473718436,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2077": {
      "node_id": "node_2077",
      "content": "MODIFICATION: Increase 9 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0021)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 145.59 kg\n  Factor of Safety: 0.64\n  Max Deflection: 9.72e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 145.59438201414355,
      "fos_buckling": 0.6384809741480998,
      "fos_yielding": 1.1732077067925597,
      "deflection": 0.009718942746633586,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.206)"
      },
      "parent_node_id": "node_2076",
      "improvement_over_parent": null
    },
    "node_2078": {
      "node_id": "node_2078",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 182.80 kg\n  Factor of Safety: 0.78\n  Max Deflection: 7.75e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.7973336175712,
      "fos_buckling": 0.7792984165622233,
      "fos_yielding": 1.470983430730595,
      "deflection": 0.007748377293826216,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_2077",
      "improvement_over_parent": null
    },
    "node_2079": {
      "node_id": "node_2079",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 204.41 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.93e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.40703899542194,
      "fos_buckling": 0.8569862397952719,
      "fos_yielding": 1.6435577574748792,
      "deflection": 0.006932874494324697,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.127)"
      },
      "parent_node_id": "node_2078",
      "improvement_over_parent": null
    },
    "node_2080": {
      "node_id": "node_2080",
      "content": "MODIFICATION: Increase 0 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 213.81 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.08e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.80606899141674,
      "fos_buckling": 0.8564325235614457,
      "fos_yielding": 1.643354608508721,
      "deflection": 0.006078455254309918,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.546)"
      },
      "parent_node_id": "node_2079",
      "improvement_over_parent": null
    },
    "node_2081": {
      "node_id": "node_2081",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.15 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.1488164084221,
      "fos_buckling": 1.0065966129993713,
      "fos_yielding": 1.997315094043592,
      "deflection": 0.005010023103469101,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.238)"
      },
      "parent_node_id": "node_2080",
      "improvement_over_parent": null
    },
    "node_2082": {
      "node_id": "node_2082",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.06 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0613530400391,
      "fos_buckling": 1.5220510598342087,
      "fos_yielding": 2.0110965769014997,
      "deflection": 0.004043037279841155,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2081",
      "improvement_over_parent": null
    },
    "node_2083": {
      "node_id": "node_2083",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2082",
      "improvement_over_parent": null
    },
    "node_2084": {
      "node_id": "node_2084",
      "content": "INITIAL DESIGN (Trace 299)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 234.46 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.93e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.46494339772792,
      "fos_buckling": 1.009030202291566,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.0059315454032171,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2085": {
      "node_id": "node_2085",
      "content": "MODIFICATION: Increase 4 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 235.94 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.93e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.93651406682832,
      "fos_buckling": 1.0088263346867945,
      "fos_yielding": 2.287133993359742,
      "deflection": 0.005928259732859598,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.431)"
      },
      "parent_node_id": "node_2084",
      "improvement_over_parent": null
    },
    "node_2086": {
      "node_id": "node_2086",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 268.85 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.84905069844535,
      "fos_buckling": 1.0721033702853595,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.004852790278222869,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2085",
      "improvement_over_parent": null
    },
    "node_2087": {
      "node_id": "node_2087",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2305226592774,
      "fos_buckling": 1.5229234759263917,
      "fos_yielding": 2.012426376658946,
      "deflection": 0.004040568907420008,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2086",
      "improvement_over_parent": null
    },
    "node_2088": {
      "node_id": "node_2088",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2087",
      "improvement_over_parent": null
    },
    "node_2089": {
      "node_id": "node_2089",
      "content": "INITIAL DESIGN (Trace 300)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 177.27 kg\n  Factor of Safety: 0.33\n  Max Deflection: 1.08e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.2661605602766,
      "fos_buckling": 0.3314307190044934,
      "fos_yielding": 1.4003699869940656,
      "deflection": 0.0107546047058322,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2090": {
      "node_id": "node_2090",
      "content": "MODIFICATION: Increase 3 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 184.59 kg\n  Factor of Safety: 0.48\n  Max Deflection: 9.65e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.59402777737319,
      "fos_buckling": 0.4751123749732054,
      "fos_yielding": 1.3997114635990149,
      "deflection": 0.009650721174247036,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.553)"
      },
      "parent_node_id": "node_2089",
      "improvement_over_parent": null
    },
    "node_2091": {
      "node_id": "node_2091",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n\nPerformance:\n  Mass: 213.84 kg\n  Factor of Safety: 0.47\n  Max Deflection: 8.63e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.8386600696257,
      "fos_buckling": 0.4741572420543509,
      "fos_yielding": 1.3988363938787076,
      "deflection": 0.008626806402404201,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004731)"
      },
      "parent_node_id": "node_2090",
      "improvement_over_parent": null
    },
    "node_2092": {
      "node_id": "node_2092",
      "content": "MODIFICATION: Increase 4 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n\nPerformance:\n  Mass: 214.90 kg\n  Factor of Safety: 0.47\n  Max Deflection: 8.60e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.90259548756694,
      "fos_buckling": 0.47415724205435095,
      "fos_yielding": 1.3988363938787072,
      "deflection": 0.008596038360443507,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.222)"
      },
      "parent_node_id": "node_2091",
      "improvement_over_parent": null
    },
    "node_2093": {
      "node_id": "node_2093",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 241.96 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.65e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.96382458554854,
      "fos_buckling": 0.522238535465236,
      "fos_yielding": 1.5731577220867656,
      "deflection": 0.007646965916913241,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_2092",
      "improvement_over_parent": null
    },
    "node_2094": {
      "node_id": "node_2094",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 286.55 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.5457557534944,
      "fos_buckling": 1.3764047486901787,
      "fos_yielding": 2.0139739049014413,
      "deflection": 0.004157353520382566,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2093",
      "improvement_over_parent": null
    },
    "node_2095": {
      "node_id": "node_2095",
      "content": "MODIFICATION: Increase 7 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.28 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2835451162299,
      "fos_buckling": 1.5230849189708864,
      "fos_yielding": 2.012773065863656,
      "deflection": 0.004040069246273256,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.203)"
      },
      "parent_node_id": "node_2094",
      "improvement_over_parent": null
    },
    "node_2096": {
      "node_id": "node_2096",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2095",
      "improvement_over_parent": null
    },
    "node_2097": {
      "node_id": "node_2097",
      "content": "INITIAL DESIGN (Trace 301)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 162.42 kg\n  Factor of Safety: 0.76\n  Max Deflection: 1.59e+11 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.41933701219563,
      "fos_buckling": 0.7555705683748086,
      "fos_yielding": 1.6042658051308536,
      "deflection": 158949218941.2668,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2098": {
      "node_id": "node_2098",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n\nPerformance:\n  Mass: 179.58 kg\n  Factor of Safety: 0.75\n  Max Deflection: 8.33e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.58358724884948,
      "fos_buckling": 0.751010081278033,
      "fos_yielding": 1.6025632942923307,
      "deflection": 0.008331523475561937,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003328)"
      },
      "parent_node_id": "node_2097",
      "improvement_over_parent": null
    },
    "node_2099": {
      "node_id": "node_2099",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n\nPerformance:\n  Mass: 183.25 kg\n  Factor of Safety: 0.75\n  Max Deflection: 7.08e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.2548697735836,
      "fos_buckling": 0.7506302457729066,
      "fos_yielding": 1.4096170149824983,
      "deflection": 0.007078653538732129,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002263)"
      },
      "parent_node_id": "node_2098",
      "improvement_over_parent": null
    },
    "node_2100": {
      "node_id": "node_2100",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 229.10 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.68e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.09963337873768,
      "fos_buckling": 0.9073876633923474,
      "fos_yielding": 1.7603054794193191,
      "deflection": 0.005678305346794349,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.271)"
      },
      "parent_node_id": "node_2099",
      "improvement_over_parent": null
    },
    "node_2101": {
      "node_id": "node_2101",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 260.58 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.5820654484654,
      "fos_buckling": 1.0079667578321514,
      "fos_yielding": 2.0006794232245775,
      "deflection": 0.005002026854955752,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.151)"
      },
      "parent_node_id": "node_2100",
      "improvement_over_parent": null
    },
    "node_2102": {
      "node_id": "node_2102",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.49 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4946020800824,
      "fos_buckling": 1.5241580317314007,
      "fos_yielding": 2.0144767276858895,
      "deflection": 0.004036867696752441,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2101",
      "improvement_over_parent": null
    },
    "node_2103": {
      "node_id": "node_2103",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2102",
      "improvement_over_parent": null
    },
    "node_2104": {
      "node_id": "node_2104",
      "content": "INITIAL DESIGN (Trace 302)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0019)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 122.23 kg\n  Factor of Safety: 0.54\n  Max Deflection: 1.06e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 122.23402949443948,
      "fos_buckling": 0.5419818183569436,
      "fos_yielding": 0.9622105661913934,
      "deflection": 0.010602186107151764,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2105": {
      "node_id": "node_2105",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 160.47 kg\n  Factor of Safety: 0.69\n  Max Deflection: 8.09e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.47093610640533,
      "fos_buckling": 0.691589265938856,
      "fos_yielding": 1.26176438570901,
      "deflection": 0.008094000679144215,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.330)"
      },
      "parent_node_id": "node_2104",
      "improvement_over_parent": null
    },
    "node_2106": {
      "node_id": "node_2106",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n\nPerformance:\n  Mass: 181.56 kg\n  Factor of Safety: 1.04\n  Max Deflection: 6.61e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.5609884910713,
      "fos_buckling": 1.0441229440138775,
      "fos_yielding": 1.2697931451529694,
      "deflection": 0.006613079245259398,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003334)"
      },
      "parent_node_id": "node_2105",
      "improvement_over_parent": null
    },
    "node_2107": {
      "node_id": "node_2107",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 234.11 kg\n  Factor of Safety: 1.30\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.10712517744233,
      "fos_buckling": 1.2995071160483918,
      "fos_yielding": 1.6350085749233483,
      "deflection": 0.005142188168199268,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.311)"
      },
      "parent_node_id": "node_2106",
      "improvement_over_parent": null
    },
    "node_2108": {
      "node_id": "node_2108",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 283.70 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.25e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 283.69768545067967,
      "fos_buckling": 1.5216306672841144,
      "fos_yielding": 1.9787267928227474,
      "deflection": 0.004253682176234795,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.232)"
      },
      "parent_node_id": "node_2107",
      "improvement_over_parent": null
    },
    "node_2109": {
      "node_id": "node_2109",
      "content": "MODIFICATION: Increase 1 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.27102997334424,
      "fos_buckling": 1.5231117575669249,
      "fos_yielding": 2.0127217932868016,
      "deflection": 0.0040401553446676895,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.412)"
      },
      "parent_node_id": "node_2108",
      "improvement_over_parent": null
    },
    "node_2110": {
      "node_id": "node_2110",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2109",
      "improvement_over_parent": null
    },
    "node_2111": {
      "node_id": "node_2111",
      "content": "INITIAL DESIGN (Trace 303)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0018)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n\nPerformance:\n  Mass: 155.83 kg\n  Factor of Safety: 0.71\n  Max Deflection: 7.68e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.83031626519352,
      "fos_buckling": 0.705253839301641,
      "fos_yielding": 1.145513401507604,
      "deflection": 0.0076847601419005995,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2112": {
      "node_id": "node_2112",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0021)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 179.89 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.66e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.8932273210141,
      "fos_buckling": 0.8061645883382278,
      "fos_yielding": 1.321183824063749,
      "deflection": 0.006664254614086343,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.163)"
      },
      "parent_node_id": "node_2111",
      "improvement_over_parent": null
    },
    "node_2113": {
      "node_id": "node_2113",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 219.56 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.47e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.56451243324375,
      "fos_buckling": 0.9678581281215669,
      "fos_yielding": 1.6100507145915228,
      "deflection": 0.005470090028833084,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.236)"
      },
      "parent_node_id": "node_2112",
      "improvement_over_parent": null
    },
    "node_2114": {
      "node_id": "node_2114",
      "content": "MODIFICATION: Increase 10 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 230.08 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.10e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.07999762512617,
      "fos_buckling": 1.17529413142258,
      "fos_yielding": 1.643315557291233,
      "deflection": 0.005101176569151229,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.445)"
      },
      "parent_node_id": "node_2113",
      "improvement_over_parent": null
    },
    "node_2115": {
      "node_id": "node_2115",
      "content": "MODIFICATION: Increase 3 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 236.15 kg\n  Factor of Safety: 1.27\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.14999790489537,
      "fos_buckling": 1.2734016767260217,
      "fos_yielding": 1.6230020720561535,
      "deflection": 0.005000626219040369,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.481)"
      },
      "parent_node_id": "node_2114",
      "improvement_over_parent": null
    },
    "node_2116": {
      "node_id": "node_2116",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.36 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.35937087595437,
      "fos_buckling": 1.523198632676273,
      "fos_yielding": 2.013585521039027,
      "deflection": 0.004038813222255589,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.266)"
      },
      "parent_node_id": "node_2115",
      "improvement_over_parent": null
    },
    "node_2117": {
      "node_id": "node_2117",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2116",
      "improvement_over_parent": null
    },
    "node_2118": {
      "node_id": "node_2118",
      "content": "INITIAL DESIGN (Trace 304)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 141.08 kg\n  Factor of Safety: 0.20\n  Max Deflection: 3.98e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.08033761629147,
      "fos_buckling": 0.19869016258399086,
      "fos_yielding": 0.6017687472340911,
      "deflection": 39785828752335.664,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2119": {
      "node_id": "node_2119",
      "content": "MODIFICATION: Increase 6 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 147.93 kg\n  Factor of Safety: 0.38\n  Max Deflection: 9.42e+12 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.92786795720508,
      "fos_buckling": 0.3798048762556547,
      "fos_yielding": 1.1233139741249853,
      "deflection": 9419143631058.83,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.462)"
      },
      "parent_node_id": "node_2118",
      "improvement_over_parent": null
    },
    "node_2120": {
      "node_id": "node_2120",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 180.33 kg\n  Factor of Safety: 0.65\n  Max Deflection: 7.30e+12 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.33151122994695,
      "fos_buckling": 0.6541756675667487,
      "fos_yielding": 1.024016979759138,
      "deflection": 7295844493516.193,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.236)"
      },
      "parent_node_id": "node_2119",
      "improvement_over_parent": null
    },
    "node_2121": {
      "node_id": "node_2121",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 217.64 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.63901977002723,
      "fos_buckling": 0.8834995617546114,
      "fos_yielding": 1.2430870261874558,
      "deflection": 0.007007184178272209,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005160)"
      },
      "parent_node_id": "node_2120",
      "improvement_over_parent": null
    },
    "node_2122": {
      "node_id": "node_2122",
      "content": "MODIFICATION: Increase 4 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 220.56 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.01e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.56405445656145,
      "fos_buckling": 0.8834995617546114,
      "fos_yielding": 1.9143203172478578,
      "deflection": 0.007007184178272209,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.582)"
      },
      "parent_node_id": "node_2121",
      "improvement_over_parent": null
    },
    "node_2123": {
      "node_id": "node_2123",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 240.97 kg\n  Factor of Safety: 0.89\n  Max Deflection: 7.02e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.97056173364587,
      "fos_buckling": 0.8943110685504758,
      "fos_yielding": 1.923451994485476,
      "deflection": 0.007015602773299918,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004006)"
      },
      "parent_node_id": "node_2122",
      "improvement_over_parent": null
    },
    "node_2124": {
      "node_id": "node_2124",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 287.93 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.9258441120428,
      "fos_buckling": 1.0364265742966743,
      "fos_yielding": 2.295192252677474,
      "deflection": 0.005880641699985397,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.214)"
      },
      "parent_node_id": "node_2123",
      "improvement_over_parent": null
    },
    "node_2125": {
      "node_id": "node_2125",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1396741458569,
      "fos_buckling": 1.5227842383365382,
      "fos_yielding": 2.011793095220969,
      "deflection": 0.004041745603270491,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2124",
      "improvement_over_parent": null
    },
    "node_2126": {
      "node_id": "node_2126",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2125",
      "improvement_over_parent": null
    },
    "node_2127": {
      "node_id": "node_2127",
      "content": "INITIAL DESIGN (Trace 305)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 192.11 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.48e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 192.11375322345,
      "fos_buckling": 0.8302081338649738,
      "fos_yielding": 1.809566020949456,
      "deflection": 0.007476140330118674,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2128": {
      "node_id": "node_2128",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n\nPerformance:\n  Mass: 211.40 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.31e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.39670036003133,
      "fos_buckling": 0.8291074770056106,
      "fos_yielding": 1.5823471656039005,
      "deflection": 0.0063120884699639345,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003769)"
      },
      "parent_node_id": "node_2127",
      "improvement_over_parent": null
    },
    "node_2129": {
      "node_id": "node_2129",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n\nPerformance:\n  Mass: 235.00 kg\n  Factor of Safety: 0.91\n  Max Deflection: 5.69e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.9961898927851,
      "fos_buckling": 0.9061218318542443,
      "fos_yielding": 1.7579904038658756,
      "deflection": 0.005686463681859922,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.121)"
      },
      "parent_node_id": "node_2128",
      "improvement_over_parent": null
    },
    "node_2130": {
      "node_id": "node_2130",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 267.29 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.2932592580672,
      "fos_buckling": 1.006548403119574,
      "fos_yielding": 1.998042252161064,
      "deflection": 0.005009314029924293,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.151)"
      },
      "parent_node_id": "node_2129",
      "improvement_over_parent": null
    },
    "node_2131": {
      "node_id": "node_2131",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.190696400457,
      "fos_buckling": 1.522736827690159,
      "fos_yielding": 2.0121651341754805,
      "deflection": 0.0040411988645082855,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2130",
      "improvement_over_parent": null
    },
    "node_2132": {
      "node_id": "node_2132",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2131",
      "improvement_over_parent": null
    },
    "node_2133": {
      "node_id": "node_2133",
      "content": "INITIAL DESIGN (Trace 306)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 184.72 kg\n  Factor of Safety: 0.87\n  Max Deflection: 3.07e+11 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.7248685171607,
      "fos_buckling": 0.8675471565127447,
      "fos_yielding": 1.8913710988032433,
      "deflection": 307337257293.02106,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2134": {
      "node_id": "node_2134",
      "content": "MODIFICATION: Increase 0 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 189.28 kg\n  Factor of Safety: 0.87\n  Max Deflection: 2.13e+11 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.28481093828765,
      "fos_buckling": 0.867547156512745,
      "fos_yielding": 1.8913710988032433,
      "deflection": 213334798871.31982,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.209)"
      },
      "parent_node_id": "node_2133",
      "improvement_over_parent": null
    },
    "node_2135": {
      "node_id": "node_2135",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n\nPerformance:\n  Mass: 210.68 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.68391201178,
      "fos_buckling": 0.8713399262697898,
      "fos_yielding": 1.8913710988032433,
      "deflection": 0.007106023514021261,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004072)"
      },
      "parent_node_id": "node_2134",
      "improvement_over_parent": null
    },
    "node_2136": {
      "node_id": "node_2136",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 236.28 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.11e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.28367053774537,
      "fos_buckling": 0.8779662946135145,
      "fos_yielding": 1.893235209973308,
      "deflection": 0.007105175779306076,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004243)"
      },
      "parent_node_id": "node_2135",
      "improvement_over_parent": null
    },
    "node_2137": {
      "node_id": "node_2137",
      "content": "MODIFICATION: Increase 4 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0053)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 239.52 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.11e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.5215294008895,
      "fos_buckling": 0.8697576723092055,
      "fos_yielding": 2.358706221694644,
      "deflection": 0.007106227847797452,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.439)"
      },
      "parent_node_id": "node_2136",
      "improvement_over_parent": null
    },
    "node_2138": {
      "node_id": "node_2138",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0053)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 243.83 kg\n  Factor of Safety: 1.08\n  Max Deflection: 4.88e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.82978100919007,
      "fos_buckling": 1.0821533768539582,
      "fos_yielding": 1.7501278538434513,
      "deflection": 0.004876817016135606,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002686)"
      },
      "parent_node_id": "node_2137",
      "improvement_over_parent": null
    },
    "node_2139": {
      "node_id": "node_2139",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0066)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 295.25 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.04e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 295.249154039028,
      "fos_buckling": 1.2861783372087237,
      "fos_yielding": 2.1257156508484054,
      "deflection": 0.004038474576520004,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.232)"
      },
      "parent_node_id": "node_2138",
      "improvement_over_parent": null
    },
    "node_2140": {
      "node_id": "node_2140",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2139",
      "improvement_over_parent": null
    },
    "node_2141": {
      "node_id": "node_2141",
      "content": "INITIAL DESIGN (Trace 307)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 189.71 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.36e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.71128053788738,
      "fos_buckling": 0.8411160285854051,
      "fos_yielding": 1.8373713822373827,
      "deflection": 0.007360615301176107,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2142": {
      "node_id": "node_2142",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 210.50 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.02e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.4997223224859,
      "fos_buckling": 0.8946127617969282,
      "fos_yielding": 1.8373713822373827,
      "deflection": 0.0060242581565310045,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003947)"
      },
      "parent_node_id": "node_2141",
      "improvement_over_parent": null
    },
    "node_2143": {
      "node_id": "node_2143",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 262.45 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.4530468858094,
      "fos_buckling": 1.073271629459408,
      "fos_yielding": 2.2898833501066775,
      "deflection": 0.004847609901583273,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.271)"
      },
      "parent_node_id": "node_2142",
      "improvement_over_parent": null
    },
    "node_2144": {
      "node_id": "node_2144",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.43 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.43159293488577,
      "fos_buckling": 1.5236980104137492,
      "fos_yielding": 2.0140899596191937,
      "deflection": 0.004037753415447545,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2143",
      "improvement_over_parent": null
    },
    "node_2145": {
      "node_id": "node_2145",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2144",
      "improvement_over_parent": null
    },
    "node_2146": {
      "node_id": "node_2146",
      "content": "INITIAL DESIGN (Trace 308)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 143.47 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.63e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 143.46707937976188,
      "fos_buckling": 0.33942870072885867,
      "fos_yielding": 0.814998229586296,
      "deflection": 0.016291160015436214,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2147": {
      "node_id": "node_2147",
      "content": "MODIFICATION: Increase 3 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 146.17 kg\n  Factor of Safety: 0.37\n  Max Deflection: 1.58e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.17361999377573,
      "fos_buckling": 0.371421285574566,
      "fos_yielding": 0.8148448537851858,
      "deflection": 0.015797216427503872,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.196)"
      },
      "parent_node_id": "node_2146",
      "improvement_over_parent": null
    },
    "node_2148": {
      "node_id": "node_2148",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 172.51 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.04e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.50812862605636,
      "fos_buckling": 0.44416318894033785,
      "fos_yielding": 1.2760896396258457,
      "deflection": 0.010418338733165212,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003561)"
      },
      "parent_node_id": "node_2147",
      "improvement_over_parent": null
    },
    "node_2149": {
      "node_id": "node_2149",
      "content": "MODIFICATION: Increase 9 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 178.00 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.99915321036195,
      "fos_buckling": 0.44399512469919206,
      "fos_yielding": 1.3066299396564995,
      "deflection": 0.010196169102703575,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.222)"
      },
      "parent_node_id": "node_2148",
      "improvement_over_parent": null
    },
    "node_2150": {
      "node_id": "node_2150",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 204.29 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.90e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.29083298980225,
      "fos_buckling": 0.49948547142015115,
      "fos_yielding": 1.5014299021952637,
      "deflection": 0.00889596560664315,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.159)"
      },
      "parent_node_id": "node_2149",
      "improvement_over_parent": null
    },
    "node_2151": {
      "node_id": "node_2151",
      "content": "MODIFICATION: Increase 5 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 204.92 kg\n  Factor of Safety: 0.50\n  Max Deflection: 8.75e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.91750919184312,
      "fos_buckling": 0.4994424097072368,
      "fos_yielding": 1.56157481743324,
      "deflection": 0.008754643634562983,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.185)"
      },
      "parent_node_id": "node_2150",
      "improvement_over_parent": null
    },
    "node_2152": {
      "node_id": "node_2152",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 240.32 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.92e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.3187922769292,
      "fos_buckling": 1.2923087920482978,
      "fos_yielding": 1.651437281681505,
      "deflection": 0.004915199180871867,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004966)"
      },
      "parent_node_id": "node_2151",
      "improvement_over_parent": null
    },
    "node_2153": {
      "node_id": "node_2153",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.28 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.279797022168,
      "fos_buckling": 1.5228065039900953,
      "fos_yielding": 2.012970494465788,
      "deflection": 0.0040399933984270765,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.242)"
      },
      "parent_node_id": "node_2152",
      "improvement_over_parent": null
    },
    "node_2154": {
      "node_id": "node_2154",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2153",
      "improvement_over_parent": null
    },
    "node_2155": {
      "node_id": "node_2155",
      "content": "INITIAL DESIGN (Trace 309)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 160.00 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.75e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.00145331886225,
      "fos_buckling": 0.47484797033630505,
      "fos_yielding": 1.3976435090675219,
      "deflection": 0.009751405562337457,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2156": {
      "node_id": "node_2156",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 196.99 kg\n  Factor of Safety: 0.58\n  Max Deflection: 7.92e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.98963194478665,
      "fos_buckling": 0.5764617032903493,
      "fos_yielding": 1.7167088089521534,
      "deflection": 0.007915216836292892,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.248)"
      },
      "parent_node_id": "node_2155",
      "improvement_over_parent": null
    },
    "node_2157": {
      "node_id": "node_2157",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 225.17 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.51e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.16607185838276,
      "fos_buckling": 1.0389072554063623,
      "fos_yielding": 1.7388821682873825,
      "deflection": 0.005510591688244232,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004544)"
      },
      "parent_node_id": "node_2156",
      "improvement_over_parent": null
    },
    "node_2158": {
      "node_id": "node_2158",
      "content": "MODIFICATION: Increase 5 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 226.41 kg\n  Factor of Safety: 1.08\n  Max Deflection: 5.40e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.4102971501455,
      "fos_buckling": 1.0757058725905402,
      "fos_yielding": 1.7289323419033196,
      "deflection": 0.005398422809654741,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.418)"
      },
      "parent_node_id": "node_2157",
      "improvement_over_parent": null
    },
    "node_2159": {
      "node_id": "node_2159",
      "content": "MODIFICATION: Increase 7 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 231.64 kg\n  Factor of Safety: 1.19\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.64240326159185,
      "fos_buckling": 1.1870999720249216,
      "fos_yielding": 1.7277489532584258,
      "deflection": 0.00523462110801461,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.244)"
      },
      "parent_node_id": "node_2158",
      "improvement_over_parent": null
    },
    "node_2160": {
      "node_id": "node_2160",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 270.90 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.48e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 270.902804688908,
      "fos_buckling": 1.3519266209701082,
      "fos_yielding": 2.016830745842785,
      "deflection": 0.004484233266993573,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.185)"
      },
      "parent_node_id": "node_2159",
      "improvement_over_parent": null
    },
    "node_2161": {
      "node_id": "node_2161",
      "content": "MODIFICATION: Increase 7 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 281.37 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.32e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.3718530644287,
      "fos_buckling": 1.468310146333719,
      "fos_yielding": 2.0151201171403614,
      "deflection": 0.004319901385241997,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.351)"
      },
      "parent_node_id": "node_2160",
      "improvement_over_parent": null
    },
    "node_2162": {
      "node_id": "node_2162",
      "content": "MODIFICATION: Increase 0 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.21894785290584,
      "fos_buckling": 1.5227198895459597,
      "fos_yielding": 2.012290852763643,
      "deflection": 0.004040957958032572,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.587)"
      },
      "parent_node_id": "node_2161",
      "improvement_over_parent": null
    },
    "node_2163": {
      "node_id": "node_2163",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2162",
      "improvement_over_parent": null
    },
    "node_2164": {
      "node_id": "node_2164",
      "content": "INITIAL DESIGN (Trace 310)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 177.73 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.03e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.72578879720618,
      "fos_buckling": 0.4449053664698944,
      "fos_yielding": 1.0194876536550472,
      "deflection": 0.010280656464607532,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2165": {
      "node_id": "node_2165",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n\nPerformance:\n  Mass: 208.65 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.68e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.65480268485223,
      "fos_buckling": 0.9917816732039938,
      "fos_yielding": 1.4429862667600692,
      "deflection": 0.0056818633799863945,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004297)"
      },
      "parent_node_id": "node_2164",
      "improvement_over_parent": null
    },
    "node_2166": {
      "node_id": "node_2166",
      "content": "MODIFICATION: Increase 4 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n\nPerformance:\n  Mass: 209.94 kg\n  Factor of Safety: 1.15\n  Max Deflection: 5.62e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.9352961249008,
      "fos_buckling": 1.1515674813550056,
      "fos_yielding": 1.4434938076235675,
      "deflection": 0.005616579278106762,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.362)"
      },
      "parent_node_id": "node_2165",
      "improvement_over_parent": null
    },
    "node_2167": {
      "node_id": "node_2167",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n\nPerformance:\n  Mass: 261.42 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.52e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 261.42025190003733,
      "fos_buckling": 1.3867345791028027,
      "fos_yielding": 1.795413839087774,
      "deflection": 0.004523945231417388,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.266)"
      },
      "parent_node_id": "node_2166",
      "improvement_over_parent": null
    },
    "node_2168": {
      "node_id": "node_2168",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.29889734641284,
      "fos_buckling": 1.523172261728103,
      "fos_yielding": 2.0129079882576915,
      "deflection": 0.004039695633875511,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.134)"
      },
      "parent_node_id": "node_2167",
      "improvement_over_parent": null
    },
    "node_2169": {
      "node_id": "node_2169",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2168",
      "improvement_over_parent": null
    },
    "node_2170": {
      "node_id": "node_2170",
      "content": "INITIAL DESIGN (Trace 311)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 216.83 kg\n  Factor of Safety: 0.67\n  Max Deflection: 6.59e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.8283067466504,
      "fos_buckling": 0.6698380399181232,
      "fos_yielding": 1.6473988346931498,
      "deflection": 0.006593530500915121,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2171": {
      "node_id": "node_2171",
      "content": "MODIFICATION: Increase 9 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 229.42 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.71e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.41620769085964,
      "fos_buckling": 0.948652844656511,
      "fos_yielding": 1.6469475033275451,
      "deflection": 0.0057135622146339,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.527)"
      },
      "parent_node_id": "node_2170",
      "improvement_over_parent": null
    },
    "node_2172": {
      "node_id": "node_2172",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 250.42 kg\n  Factor of Safety: 1.04\n  Max Deflection: 4.77e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.42045907118992,
      "fos_buckling": 1.0365628011245052,
      "fos_yielding": 1.668034436833055,
      "deflection": 0.004766842649331917,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004133)"
      },
      "parent_node_id": "node_2171",
      "improvement_over_parent": null
    },
    "node_2173": {
      "node_id": "node_2173",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 290.57 kg\n  Factor of Safety: 1.19\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.5686475938709,
      "fos_buckling": 1.1876823133506436,
      "fos_yielding": 1.9412574768085211,
      "deflection": 0.004117063843316591,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.176)"
      },
      "parent_node_id": "node_2172",
      "improvement_over_parent": null
    },
    "node_2174": {
      "node_id": "node_2174",
      "content": "MODIFICATION: Increase 4 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0053)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.18\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.19903342430223,
      "fos_buckling": 1.17725631713542,
      "fos_yielding": 1.924216267321381,
      "deflection": 0.004056051868842272,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.590)"
      },
      "parent_node_id": "node_2173",
      "improvement_over_parent": null
    },
    "node_2175": {
      "node_id": "node_2175",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2174",
      "improvement_over_parent": null
    },
    "node_2176": {
      "node_id": "node_2176",
      "content": "INITIAL DESIGN (Trace 312)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 169.86 kg\n  Factor of Safety: 0.73\n  Max Deflection: 7.63e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.86497222423287,
      "fos_buckling": 0.7270806121061463,
      "fos_yielding": 1.4464515371529902,
      "deflection": 0.0076329692559014535,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2177": {
      "node_id": "node_2177",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 188.39 kg\n  Factor of Safety: 0.80\n  Max Deflection: 6.89e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.39117958546635,
      "fos_buckling": 0.7960104402011688,
      "fos_yielding": 1.6039263844058258,
      "deflection": 0.006890377716120797,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.116)"
      },
      "parent_node_id": "node_2176",
      "improvement_over_parent": null
    },
    "node_2178": {
      "node_id": "node_2178",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 243.72 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.34e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.7188850346912,
      "fos_buckling": 0.989921097065552,
      "fos_yielding": 2.0738894097896226,
      "deflection": 0.00534469345180732,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.319)"
      },
      "parent_node_id": "node_2177",
      "improvement_over_parent": null
    },
    "node_2179": {
      "node_id": "node_2179",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.56 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.5594949146373,
      "fos_buckling": 1.071197624200024,
      "fos_yielding": 2.284729769558348,
      "deflection": 0.0048578823941991915,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.112)"
      },
      "parent_node_id": "node_2178",
      "improvement_over_parent": null
    },
    "node_2180": {
      "node_id": "node_2180",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 292.94 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.94096687546937,
      "fos_buckling": 1.521758961887391,
      "fos_yielding": 2.0102695353821725,
      "deflection": 0.004044693240706394,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2179",
      "improvement_over_parent": null
    },
    "node_2181": {
      "node_id": "node_2181",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2180",
      "improvement_over_parent": null
    },
    "node_2182": {
      "node_id": "node_2182",
      "content": "INITIAL DESIGN (Trace 313)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 188.37 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.13e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.36606689008647,
      "fos_buckling": 1.0127209144952314,
      "fos_yielding": 1.3800410459141876,
      "deflection": 0.0061289093620731875,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2183": {
      "node_id": "node_2183",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 232.52 kg\n  Factor of Safety: 1.21\n  Max Deflection: 4.98e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.51980621270397,
      "fos_buckling": 1.2132411496601405,
      "fos_yielding": 1.7005489965678564,
      "deflection": 0.004978822418638705,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.252)"
      },
      "parent_node_id": "node_2182",
      "improvement_over_parent": null
    },
    "node_2184": {
      "node_id": "node_2184",
      "content": "MODIFICATION: Increase 8 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 242.02 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.02192561361815,
      "fos_buckling": 1.2439331471697703,
      "fos_yielding": 1.7016821512673264,
      "deflection": 0.004857581133818969,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.560)"
      },
      "parent_node_id": "node_2183",
      "improvement_over_parent": null
    },
    "node_2185": {
      "node_id": "node_2185",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 286.62 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.61583731534597,
      "fos_buckling": 1.4429308485566232,
      "fos_yielding": 2.012588616122011,
      "deflection": 0.004112486961466224,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.202)"
      },
      "parent_node_id": "node_2184",
      "improvement_over_parent": null
    },
    "node_2186": {
      "node_id": "node_2186",
      "content": "MODIFICATION: Increase 2 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.37 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.37054606529034,
      "fos_buckling": 1.5236065820199227,
      "fos_yielding": 2.013599992849524,
      "deflection": 0.004038603476681529,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.387)"
      },
      "parent_node_id": "node_2185",
      "improvement_over_parent": null
    },
    "node_2187": {
      "node_id": "node_2187",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2186",
      "improvement_over_parent": null
    },
    "node_2188": {
      "node_id": "node_2188",
      "content": "INITIAL DESIGN (Trace 314)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 190.68 kg\n  Factor of Safety: 0.12\n  Max Deflection: 4.57e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.68446564099148,
      "fos_buckling": 0.11977652103473597,
      "fos_yielding": 0.28132684281909387,
      "deflection": 45655447174795.89,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2189": {
      "node_id": "node_2189",
      "content": "MODIFICATION: Increase 2 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 192.31 kg\n  Factor of Safety: 0.12\n  Max Deflection: 4.57e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 192.3133619640245,
      "fos_buckling": 0.11977652103473597,
      "fos_yielding": 0.28132684281909387,
      "deflection": 45655447174795.89,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.330)"
      },
      "parent_node_id": "node_2188",
      "improvement_over_parent": null
    },
    "node_2190": {
      "node_id": "node_2190",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 216.69 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.29e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.6948339248566,
      "fos_buckling": 0.5227253752342734,
      "fos_yielding": 1.5736953646183685,
      "deflection": 0.008289747648402318,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2189",
      "improvement_over_parent": null
    },
    "node_2191": {
      "node_id": "node_2191",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 261.28 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 261.27676509280246,
      "fos_buckling": 1.0070746057658093,
      "fos_yielding": 1.9984818247548324,
      "deflection": 0.005006784750147092,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2190",
      "improvement_over_parent": null
    },
    "node_2192": {
      "node_id": "node_2192",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 287.17 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.17420223519224,
      "fos_buckling": 1.48148445226038,
      "fos_yielding": 2.0117351516239066,
      "deflection": 0.004096603309178468,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2191",
      "improvement_over_parent": null
    },
    "node_2193": {
      "node_id": "node_2193",
      "content": "MODIFICATION: Increase 8 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0061)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 292.51 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.51377569207745,
      "fos_buckling": 1.4794003010056023,
      "fos_yielding": 1.9997928050228884,
      "deflection": 0.004058997975700903,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.247)"
      },
      "parent_node_id": "node_2192",
      "improvement_over_parent": null
    },
    "node_2194": {
      "node_id": "node_2194",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2193",
      "improvement_over_parent": null
    },
    "node_2195": {
      "node_id": "node_2195",
      "content": "INITIAL DESIGN (Trace 315)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 210.74 kg\n  Factor of Safety: 0.32\n  Max Deflection: 2.42e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.74371533520915,
      "fos_buckling": 0.3216539819720252,
      "fos_yielding": 1.4152220382469995,
      "deflection": 0.024248678241705627,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2196": {
      "node_id": "node_2196",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 250.80 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.53e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.79959293629915,
      "fos_buckling": 0.9490766727112243,
      "fos_yielding": 2.064872294022001,
      "deflection": 0.006533346566463392,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005573)"
      },
      "parent_node_id": "node_2195",
      "improvement_over_parent": null
    },
    "node_2197": {
      "node_id": "node_2197",
      "content": "MODIFICATION: Increase 3 thickness by 62%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 258.80 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.54e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.7959655638598,
      "fos_buckling": 0.9494395370064165,
      "fos_yielding": 2.064705952418101,
      "deflection": 0.0065368654733606295,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.623)"
      },
      "parent_node_id": "node_2196",
      "improvement_over_parent": null
    },
    "node_2198": {
      "node_id": "node_2198",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 263.48 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.49e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.4807087462028,
      "fos_buckling": 1.3957400911426179,
      "fos_yielding": 1.8094885509337548,
      "deflection": 0.004489163256308756,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002941)"
      },
      "parent_node_id": "node_2197",
      "improvement_over_parent": null
    },
    "node_2199": {
      "node_id": "node_2199",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.21 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2118168581587,
      "fos_buckling": 1.5227832661220368,
      "fos_yielding": 2.012322651568615,
      "deflection": 0.004040927685219848,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.124)"
      },
      "parent_node_id": "node_2198",
      "improvement_over_parent": null
    },
    "node_2200": {
      "node_id": "node_2200",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2199",
      "improvement_over_parent": null
    },
    "node_2201": {
      "node_id": "node_2201",
      "content": "INITIAL DESIGN (Trace 316)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 146.69 kg\n  Factor of Safety: 0.14\n  Max Deflection: 1.11e+14 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.6902412258806,
      "fos_buckling": 0.14147037368540283,
      "fos_yielding": 0.15966575014110873,
      "deflection": 111123974056644.14,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2202": {
      "node_id": "node_2202",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n\nPerformance:\n  Mass: 162.65 kg\n  Factor of Safety: 0.36\n  Max Deflection: 1.13e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.6519028467033,
      "fos_buckling": 0.3647414847722063,
      "fos_yielding": 0.8013786886726196,
      "deflection": 0.011330485667224156,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003081)"
      },
      "parent_node_id": "node_2201",
      "improvement_over_parent": null
    },
    "node_2203": {
      "node_id": "node_2203",
      "content": "MODIFICATION: Increase 1 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n\nPerformance:\n  Mass: 166.93 kg\n  Factor of Safety: 0.36\n  Max Deflection: 1.13e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.92881434388272,
      "fos_buckling": 0.364633924177482,
      "fos_yielding": 0.8013053115965959,
      "deflection": 0.01133324730592058,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.192)"
      },
      "parent_node_id": "node_2202",
      "improvement_over_parent": null
    },
    "node_2204": {
      "node_id": "node_2204",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n\nPerformance:\n  Mass: 207.65 kg\n  Factor of Safety: 0.44\n  Max Deflection: 9.12e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.6508225985968,
      "fos_buckling": 0.44137673045747067,
      "fos_yielding": 1.0024985868894785,
      "deflection": 0.009120306665903688,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.267)"
      },
      "parent_node_id": "node_2203",
      "improvement_over_parent": null
    },
    "node_2205": {
      "node_id": "node_2205",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 240.56 kg\n  Factor of Safety: 0.44\n  Max Deflection: 8.35e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.5633592302138,
      "fos_buckling": 0.4403800452850527,
      "fos_yielding": 1.0017936360583883,
      "deflection": 0.008351439298269127,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2204",
      "improvement_over_parent": null
    },
    "node_2206": {
      "node_id": "node_2206",
      "content": "MODIFICATION: Increase 3 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0048)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 242.09 kg\n  Factor of Safety: 0.44\n  Max Deflection: 8.33e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.09445224169377,
      "fos_buckling": 0.44038004528505253,
      "fos_yielding": 1.0017936360583883,
      "deflection": 0.008329378355715652,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.245)"
      },
      "parent_node_id": "node_2205",
      "improvement_over_parent": null
    },
    "node_2207": {
      "node_id": "node_2207",
      "content": "MODIFICATION: Increase 6 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0048)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0100)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 265.14 kg\n  Factor of Safety: 0.44\n  Max Deflection: 8.07e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.1357348293301,
      "fos_buckling": 0.43968496419529557,
      "fos_yielding": 1.0013007064842179,
      "deflection": 0.00806543574173584,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.626)"
      },
      "parent_node_id": "node_2206",
      "improvement_over_parent": null
    },
    "node_2208": {
      "node_id": "node_2208",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0048)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0100)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 309.72 kg\n  Factor of Safety: 1.13\n  Max Deflection: 3.92e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 309.71766599727596,
      "fos_buckling": 1.1346554903979116,
      "fos_yielding": 1.3084315301327203,
      "deflection": 0.003920950740022911,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2207",
      "improvement_over_parent": null
    },
    "node_2209": {
      "node_id": "node_2209",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2208",
      "improvement_over_parent": null
    },
    "node_2210": {
      "node_id": "node_2210",
      "content": "INITIAL DESIGN (Trace 317)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0016)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0015)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 136.51 kg\n  Factor of Safety: 0.65\n  Max Deflection: 9.06e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 136.51174323947757,
      "fos_buckling": 0.6489298702581369,
      "fos_yielding": 0.8118425165720147,
      "deflection": 0.00906139426351666,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2211": {
      "node_id": "node_2211",
      "content": "MODIFICATION: Increase 5 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0016)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 138.52 kg\n  Factor of Safety: 0.65\n  Max Deflection: 9.06e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 138.51814447613262,
      "fos_buckling": 0.6489298702581369,
      "fos_yielding": 1.272652279898918,
      "deflection": 0.009061394263516659,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.595)"
      },
      "parent_node_id": "node_2210",
      "improvement_over_parent": null
    },
    "node_2212": {
      "node_id": "node_2212",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 166.32 kg\n  Factor of Safety: 0.76\n  Max Deflection: 7.56e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.32076886284807,
      "fos_buckling": 0.7629069300174527,
      "fos_yielding": 1.5268175263777823,
      "deflection": 0.00756133129558203,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.212)"
      },
      "parent_node_id": "node_2211",
      "improvement_over_parent": null
    },
    "node_2213": {
      "node_id": "node_2213",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 209.69 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.02e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.68759486069413,
      "fos_buckling": 0.9300215962382751,
      "fos_yielding": 1.9223338840959727,
      "deflection": 0.006015770374775287,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.280)"
      },
      "parent_node_id": "node_2212",
      "improvement_over_parent": null
    },
    "node_2214": {
      "node_id": "node_2214",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 230.17 kg\n  Factor of Safety: 1.20\n  Max Deflection: 5.03e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.16957492589336,
      "fos_buckling": 1.1974410519444971,
      "fos_yielding": 1.690313834319362,
      "deflection": 0.005028884360186944,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004022)"
      },
      "parent_node_id": "node_2213",
      "improvement_over_parent": null
    },
    "node_2215": {
      "node_id": "node_2215",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 274.19 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.23e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 274.19212683237754,
      "fos_buckling": 1.3835032796641331,
      "fos_yielding": 2.009943339850095,
      "deflection": 0.004233093767763457,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.209)"
      },
      "parent_node_id": "node_2214",
      "improvement_over_parent": null
    },
    "node_2216": {
      "node_id": "node_2216",
      "content": "MODIFICATION: Increase 8 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0074)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 285.70 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.70110726970194,
      "fos_buckling": 1.3804544788789765,
      "fos_yielding": 1.9879723054592608,
      "deflection": 0.00416387412259257,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.427)"
      },
      "parent_node_id": "node_2215",
      "improvement_over_parent": null
    },
    "node_2217": {
      "node_id": "node_2217",
      "content": "MODIFICATION: Increase 2 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0074)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 295.41 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.07e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 295.41112574208023,
      "fos_buckling": 1.449517321480802,
      "fos_yielding": 1.9893782400692388,
      "deflection": 0.004066420585172356,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.658)"
      },
      "parent_node_id": "node_2216",
      "improvement_over_parent": null
    },
    "node_2218": {
      "node_id": "node_2218",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2217",
      "improvement_over_parent": null
    },
    "node_2219": {
      "node_id": "node_2219",
      "content": "INITIAL DESIGN (Trace 318)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 174.48 kg\n  Factor of Safety: 0.81\n  Max Deflection: 7.69e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.4763039363104,
      "fos_buckling": 0.8106604362961742,
      "fos_yielding": 1.7585389014066357,
      "deflection": 0.007685121360263034,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2220": {
      "node_id": "node_2220",
      "content": "MODIFICATION: Increase 4 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 175.51 kg\n  Factor of Safety: 0.81\n  Max Deflection: 7.68e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.50985197476734,
      "fos_buckling": 0.8105449432007042,
      "fos_yielding": 1.7585389014066357,
      "deflection": 0.007682543964711919,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.372)"
      },
      "parent_node_id": "node_2219",
      "improvement_over_parent": null
    },
    "node_2221": {
      "node_id": "node_2221",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n\nPerformance:\n  Mass: 196.17 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.37e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.16870333190263,
      "fos_buckling": 0.8621038092246648,
      "fos_yielding": 1.7585389014066357,
      "deflection": 0.006369731708768637,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003262)"
      },
      "parent_node_id": "node_2220",
      "improvement_over_parent": null
    },
    "node_2222": {
      "node_id": "node_2222",
      "content": "MODIFICATION: Increase 7 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n\nPerformance:\n  Mass: 200.23 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.37e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.2255618953301,
      "fos_buckling": 0.861863169876796,
      "fos_yielding": 1.7580954329053216,
      "deflection": 0.006371363644454161,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.239)"
      },
      "parent_node_id": "node_2221",
      "improvement_over_parent": null
    },
    "node_2223": {
      "node_id": "node_2223",
      "content": "MODIFICATION: Increase 8 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n\nPerformance:\n  Mass: 210.80 kg\n  Factor of Safety: 1.08\n  Max Deflection: 5.90e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.79646730054355,
      "fos_buckling": 1.0808308183382254,
      "fos_yielding": 1.7580954329053213,
      "deflection": 0.005896616095190766,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.339)"
      },
      "parent_node_id": "node_2222",
      "improvement_over_parent": null
    },
    "node_2224": {
      "node_id": "node_2224",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0071)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n\nPerformance:\n  Mass: 235.07 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.30e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.06676496258132,
      "fos_buckling": 1.1756946186281896,
      "fos_yielding": 1.9609261779993215,
      "deflection": 0.00529733900548423,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.125)"
      },
      "parent_node_id": "node_2223",
      "improvement_over_parent": null
    },
    "node_2225": {
      "node_id": "node_2225",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0071)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 255.95 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.59e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.95358916352254,
      "fos_buckling": 1.3093098821002922,
      "fos_yielding": 1.754144372760558,
      "deflection": 0.004585513670988348,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004108)"
      },
      "parent_node_id": "node_2224",
      "improvement_over_parent": null
    },
    "node_2226": {
      "node_id": "node_2226",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0048)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0084)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 298.40 kg\n  Factor of Safety: 1.49\n  Max Deflection: 3.94e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 298.399470791909,
      "fos_buckling": 1.4858820760367069,
      "fos_yielding": 2.0439503458379638,
      "deflection": 0.003942608066323831,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.183)"
      },
      "parent_node_id": "node_2225",
      "improvement_over_parent": null
    },
    "node_2227": {
      "node_id": "node_2227",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2226",
      "improvement_over_parent": null
    },
    "node_2228": {
      "node_id": "node_2228",
      "content": "INITIAL DESIGN (Trace 319)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n\nPerformance:\n  Mass: 104.68 kg\n  Factor of Safety: 0.26\n  Max Deflection: 2.17e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 104.6839777655988,
      "fos_buckling": 0.2622380498122321,
      "fos_yielding": 0.9649820736328597,
      "deflection": 21733760116698.99,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2229": {
      "node_id": "node_2229",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n\nPerformance:\n  Mass: 107.19 kg\n  Factor of Safety: 0.28\n  Max Deflection: 1.71e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 107.19250191604625,
      "fos_buckling": 0.27705209351547694,
      "fos_yielding": 0.7600966077259463,
      "deflection": 0.01711638188274322,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001516)"
      },
      "parent_node_id": "node_2228",
      "improvement_over_parent": null
    },
    "node_2230": {
      "node_id": "node_2230",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n\nPerformance:\n  Mass: 135.28 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.36e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 135.2774027201714,
      "fos_buckling": 0.341742022768879,
      "fos_yielding": 0.9583597640781324,
      "deflection": 0.01358515097562977,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.276)"
      },
      "parent_node_id": "node_2229",
      "improvement_over_parent": null
    },
    "node_2231": {
      "node_id": "node_2231",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 176.01 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.05e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.00811623210717,
      "fos_buckling": 0.42979943872705745,
      "fos_yielding": 1.2452455620601206,
      "deflection": 0.010466211384082337,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.323)"
      },
      "parent_node_id": "node_2230",
      "improvement_over_parent": null
    },
    "node_2232": {
      "node_id": "node_2232",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 223.14 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.28e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.13600553558564,
      "fos_buckling": 0.5232416863051945,
      "fos_yielding": 1.576233901315169,
      "deflection": 0.008278356284993897,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.294)"
      },
      "parent_node_id": "node_2231",
      "improvement_over_parent": null
    },
    "node_2233": {
      "node_id": "node_2233",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 249.03 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.51e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.03344267797542,
      "fos_buckling": 0.5223122866051864,
      "fos_yielding": 1.5753621467035788,
      "deflection": 0.007507954310744267,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2232",
      "improvement_over_parent": null
    },
    "node_2234": {
      "node_id": "node_2234",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0039)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.62 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.6153738459213,
      "fos_buckling": 1.523412095294814,
      "fos_yielding": 2.015756278595413,
      "deflection": 0.004035398002345005,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2233",
      "improvement_over_parent": null
    },
    "node_2235": {
      "node_id": "node_2235",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2234",
      "improvement_over_parent": null
    },
    "node_2236": {
      "node_id": "node_2236",
      "content": "INITIAL DESIGN (Trace 320)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 209.49 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.81e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.4859191916957,
      "fos_buckling": 1.0124843714870961,
      "fos_yielding": 1.59257656741936,
      "deflection": 0.005814033917919219,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2237": {
      "node_id": "node_2237",
      "content": "MODIFICATION: Increase 7 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 222.04 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.45e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.04410712404268,
      "fos_buckling": 1.2142331740432355,
      "fos_yielding": 1.590301012888652,
      "deflection": 0.005447251425713087,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.626)"
      },
      "parent_node_id": "node_2236",
      "improvement_over_parent": null
    },
    "node_2238": {
      "node_id": "node_2238",
      "content": "MODIFICATION: Increase 0 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 231.10 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.10149461656843,
      "fos_buckling": 1.2504343264041857,
      "fos_yielding": 1.5882113764895673,
      "deflection": 0.005108443943514258,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.548)"
      },
      "parent_node_id": "node_2237",
      "improvement_over_parent": null
    },
    "node_2239": {
      "node_id": "node_2239",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.204948078149,
      "fos_buckling": 1.5227390246382682,
      "fos_yielding": 2.012192507991465,
      "deflection": 0.0040409630522108995,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.295)"
      },
      "parent_node_id": "node_2238",
      "improvement_over_parent": null
    },
    "node_2240": {
      "node_id": "node_2240",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2239",
      "improvement_over_parent": null
    },
    "node_2241": {
      "node_id": "node_2241",
      "content": "INITIAL DESIGN (Trace 321)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 209.49 kg\n  Factor of Safety: 0.04\n  Max Deflection: 1.74e+14 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.49324711663263,
      "fos_buckling": 0.036140430924591474,
      "fos_yielding": 0.13150258395278427,
      "deflection": 174411663420653.28,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2242": {
      "node_id": "node_2242",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 214.71 kg\n  Factor of Safety: 0.96\n  Max Deflection: 1.71e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.70707715044674,
      "fos_buckling": 0.9592192499516959,
      "fos_yielding": 1.4521938504786753,
      "deflection": 17053911392062.475,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2241",
      "improvement_over_parent": null
    },
    "node_2243": {
      "node_id": "node_2243",
      "content": "MODIFICATION: Increase 4 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 217.12 kg\n  Factor of Safety: 0.96\n  Max Deflection: 1.71e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.1169220196245,
      "fos_buckling": 0.9592192499516959,
      "fos_yielding": 1.4521938504786753,
      "deflection": 17053911392062.475,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.570)"
      },
      "parent_node_id": "node_2242",
      "improvement_over_parent": null
    },
    "node_2244": {
      "node_id": "node_2244",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 250.03 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.0294586512415,
      "fos_buckling": 0.5884040702063129,
      "fos_yielding": 1.8999328722345763,
      "deflection": 0.007194120924953243,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2243",
      "improvement_over_parent": null
    },
    "node_2245": {
      "node_id": "node_2245",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22751658869373,
      "fos_buckling": 1.5228820254298117,
      "fos_yielding": 2.012441926712929,
      "deflection": 0.004040707812509777,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2244",
      "improvement_over_parent": null
    },
    "node_2246": {
      "node_id": "node_2246",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2245",
      "improvement_over_parent": null
    },
    "node_2247": {
      "node_id": "node_2247",
      "content": "INITIAL DESIGN (Trace 322)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 244.16 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.72e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.1632903013001,
      "fos_buckling": 0.9260010997171215,
      "fos_yielding": 2.005500050364755,
      "deflection": 0.00672133741846565,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2248": {
      "node_id": "node_2248",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 279.80 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.87e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 279.79900823686125,
      "fos_buckling": 1.035826657087091,
      "fos_yielding": 2.295126119118127,
      "deflection": 0.0058736763692874595,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.160)"
      },
      "parent_node_id": "node_2247",
      "improvement_over_parent": null
    },
    "node_2249": {
      "node_id": "node_2249",
      "content": "MODIFICATION: Increase 2 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.13 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.1326045547291,
      "fos_buckling": 1.036990316111778,
      "fos_yielding": 2.296862058099602,
      "deflection": 0.005876904351941102,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.520)"
      },
      "parent_node_id": "node_2248",
      "improvement_over_parent": null
    },
    "node_2250": {
      "node_id": "node_2250",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.35 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.34643458854316,
      "fos_buckling": 1.5233648787315177,
      "fos_yielding": 2.0132919652943113,
      "deflection": 0.004039124552504586,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2249",
      "improvement_over_parent": null
    },
    "node_2251": {
      "node_id": "node_2251",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2250",
      "improvement_over_parent": null
    },
    "node_2252": {
      "node_id": "node_2252",
      "content": "INITIAL DESIGN (Trace 323)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 152.97 kg\n  Factor of Safety: 0.81\n  Max Deflection: 7.93e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.97120171140716,
      "fos_buckling": 0.8132768382611529,
      "fos_yielding": 1.1029116229869969,
      "deflection": 0.007927216203799612,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2253": {
      "node_id": "node_2253",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 179.36 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.77e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.36459869142408,
      "fos_buckling": 0.9440452148050372,
      "fos_yielding": 1.2920298736792544,
      "deflection": 0.006768734158821563,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.182)"
      },
      "parent_node_id": "node_2252",
      "improvement_over_parent": null
    },
    "node_2254": {
      "node_id": "node_2254",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 219.78 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.53e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.7801358677291,
      "fos_buckling": 1.1387722606019022,
      "fos_yielding": 1.5809236225988617,
      "deflection": 0.005533923208361516,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.241)"
      },
      "parent_node_id": "node_2253",
      "improvement_over_parent": null
    },
    "node_2255": {
      "node_id": "node_2255",
      "content": "MODIFICATION: Increase 5 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 220.62 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.46e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.62107754744093,
      "fos_buckling": 1.2214023317592306,
      "fos_yielding": 1.5753911380919257,
      "deflection": 0.005464239667907823,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.279)"
      },
      "parent_node_id": "node_2254",
      "improvement_over_parent": null
    },
    "node_2256": {
      "node_id": "node_2256",
      "content": "MODIFICATION: Increase 0 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 228.95 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.16e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.95044304848,
      "fos_buckling": 1.2405459606867726,
      "fos_yielding": 1.5735205654385647,
      "deflection": 0.005155744036500061,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.490)"
      },
      "parent_node_id": "node_2255",
      "improvement_over_parent": null
    },
    "node_2257": {
      "node_id": "node_2257",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.40 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.39552144649457,
      "fos_buckling": 1.5235578248694812,
      "fos_yielding": 2.0135113000397493,
      "deflection": 0.004038344292239608,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.309)"
      },
      "parent_node_id": "node_2256",
      "improvement_over_parent": null
    },
    "node_2258": {
      "node_id": "node_2258",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2257",
      "improvement_over_parent": null
    },
    "node_2259": {
      "node_id": "node_2259",
      "content": "INITIAL DESIGN (Trace 324)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 159.22 kg\n  Factor of Safety: 0.99\n  Max Deflection: 6.72e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.21713204528305,
      "fos_buckling": 0.9885689182672599,
      "fos_yielding": 1.8868031232760032,
      "deflection": 6720359475018.991,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2260": {
      "node_id": "node_2260",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 193.29 kg\n  Factor of Safety: 1.86\n  Max Deflection: 1.03e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.28675721748,
      "fos_buckling": 1.8632764156873667,
      "fos_yielding": 1.1253073712763755,
      "deflection": 10293298280955.232,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.235)"
      },
      "parent_node_id": "node_2259",
      "improvement_over_parent": null
    },
    "node_2261": {
      "node_id": "node_2261",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 224.27 kg\n  Factor of Safety: 0.10\n  Max Deflection: 1.18e+14 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.26530326655634,
      "fos_buckling": 0.09504488471897192,
      "fos_yielding": 0.3892430006249031,
      "deflection": 117719252698871.75,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2260",
      "improvement_over_parent": null
    },
    "node_2262": {
      "node_id": "node_2262",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 267.46 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.46336120400855,
      "fos_buckling": 1.0066934464724793,
      "fos_yielding": 1.9997768259638906,
      "deflection": 0.005006445067651327,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2261",
      "improvement_over_parent": null
    },
    "node_2263": {
      "node_id": "node_2263",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.36 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3607983463983,
      "fos_buckling": 1.5236080412290989,
      "fos_yielding": 2.013910156349437,
      "deflection": 0.004038681756162034,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2262",
      "improvement_over_parent": null
    },
    "node_2264": {
      "node_id": "node_2264",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2263",
      "improvement_over_parent": null
    },
    "node_2265": {
      "node_id": "node_2265",
      "content": "INITIAL DESIGN (Trace 325)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2266": {
      "node_id": "node_2266",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n\nPerformance:\n  Mass: 134.15 kg\n  Factor of Safety: 0.30\n  Max Deflection: 4.74e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 134.1474371500963,
      "fos_buckling": 0.30432074920996555,
      "fos_yielding": 1.2160646729817197,
      "deflection": 47406274335443.164,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003657)"
      },
      "parent_node_id": "node_2265",
      "improvement_over_parent": null
    },
    "node_2267": {
      "node_id": "node_2267",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 157.97 kg\n  Factor of Safety: 0.42\n  Max Deflection: 1.43e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.96878181607002,
      "fos_buckling": 0.4203171505438678,
      "fos_yielding": 1.0294692916368602,
      "deflection": 0.014311526891659994,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003927)"
      },
      "parent_node_id": "node_2266",
      "improvement_over_parent": null
    },
    "node_2268": {
      "node_id": "node_2268",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 205.46 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.10e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.46361235796786,
      "fos_buckling": 0.5231942401380573,
      "fos_yielding": 1.3377962526869587,
      "deflection": 0.011032443451621939,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.330)"
      },
      "parent_node_id": "node_2267",
      "improvement_over_parent": null
    },
    "node_2269": {
      "node_id": "node_2269",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 248.66 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.6616702954201,
      "fos_buckling": 0.5216440641147452,
      "fos_yielding": 1.572710088253061,
      "deflection": 0.007519806328576212,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2268",
      "improvement_over_parent": null
    },
    "node_2270": {
      "node_id": "node_2270",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.24360146336596,
      "fos_buckling": 1.5229383268035952,
      "fos_yielding": 2.0125454265300604,
      "deflection": 0.004040474716090804,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2269",
      "improvement_over_parent": null
    },
    "node_2271": {
      "node_id": "node_2271",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2270",
      "improvement_over_parent": null
    },
    "node_2272": {
      "node_id": "node_2272",
      "content": "INITIAL DESIGN (Trace 326)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 127.18 kg\n  Factor of Safety: 0.57\n  Max Deflection: 9.92e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 127.17873998370985,
      "fos_buckling": 0.5735449839491519,
      "fos_yielding": 1.11084910063916,
      "deflection": 0.009918512671023585,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2273": {
      "node_id": "node_2273",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 152.71 kg\n  Factor of Safety: 0.68\n  Max Deflection: 8.27e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.71116387473677,
      "fos_buckling": 0.6764858426264574,
      "fos_yielding": 1.3335858785612653,
      "deflection": 0.00827359942713587,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.211)"
      },
      "parent_node_id": "node_2272",
      "improvement_over_parent": null
    },
    "node_2274": {
      "node_id": "node_2274",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n\nPerformance:\n  Mass: 170.74 kg\n  Factor of Safety: 0.96\n  Max Deflection: 6.89e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.73938321966844,
      "fos_buckling": 0.9601747159309602,
      "fos_yielding": 1.17516093795185,
      "deflection": 0.006890003042624983,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002922)"
      },
      "parent_node_id": "node_2273",
      "improvement_over_parent": null
    },
    "node_2275": {
      "node_id": "node_2275",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n\nPerformance:\n  Mass: 218.54 kg\n  Factor of Safety: 1.19\n  Max Deflection: 5.40e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.54499587081162,
      "fos_buckling": 1.1921668167902975,
      "fos_yielding": 1.5025717246466745,
      "deflection": 0.005397861583810668,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_2274",
      "improvement_over_parent": null
    },
    "node_2276": {
      "node_id": "node_2276",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0053)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0056)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 266.40 kg\n  Factor of Safety: 1.41\n  Max Deflection: 4.44e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 266.4042675040515,
      "fos_buckling": 1.408514914010353,
      "fos_yielding": 1.8296421585184137,
      "deflection": 0.004440469896365068,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.238)"
      },
      "parent_node_id": "node_2275",
      "improvement_over_parent": null
    },
    "node_2277": {
      "node_id": "node_2277",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.31 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.31016740153586,
      "fos_buckling": 1.523203762474534,
      "fos_yielding": 2.0132069727689097,
      "deflection": 0.00403943260139378,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.111)"
      },
      "parent_node_id": "node_2276",
      "improvement_over_parent": null
    },
    "node_2278": {
      "node_id": "node_2278",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2277",
      "improvement_over_parent": null
    },
    "node_2279": {
      "node_id": "node_2279",
      "content": "INITIAL DESIGN (Trace 327)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0017)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 188.62 kg\n  Factor of Safety: 0.74\n  Max Deflection: 6.35e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.6201510300775,
      "fos_buckling": 0.7434905854373548,
      "fos_yielding": 0.8245562604205015,
      "deflection": 0.006345269070585838,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2280": {
      "node_id": "node_2280",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 231.15 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.14924565410792,
      "fos_buckling": 0.9011213227162073,
      "fos_yielding": 1.014777367017985,
      "deflection": 0.005189052523627448,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.242)"
      },
      "parent_node_id": "node_2279",
      "improvement_over_parent": null
    },
    "node_2281": {
      "node_id": "node_2281",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 289.52 kg\n  Factor of Safety: 1.11\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.51895823294166,
      "fos_buckling": 1.1114016557979824,
      "fos_yielding": 1.2790452799079863,
      "deflection": 0.004155126113320962,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.277)"
      },
      "parent_node_id": "node_2280",
      "improvement_over_parent": null
    },
    "node_2282": {
      "node_id": "node_2282",
      "content": "MODIFICATION: Increase 6 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.25760134571516,
      "fos_buckling": 1.5230024569826346,
      "fos_yielding": 2.012347191900936,
      "deflection": 0.004040276481885098,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.658)"
      },
      "parent_node_id": "node_2281",
      "improvement_over_parent": null
    },
    "node_2283": {
      "node_id": "node_2283",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2282",
      "improvement_over_parent": null
    },
    "node_2284": {
      "node_id": "node_2284",
      "content": "INITIAL DESIGN (Trace 328)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0013)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0020)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0017)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0013)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0011)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0015)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0018)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0018)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0021)]\n\nPerformance:\n  Mass: 91.72 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.42e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 91.71647572343063,
      "fos_buckling": 0.4317368050227795,
      "fos_yielding": 0.8170387914844391,
      "deflection": 0.014179456952916877,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2285": {
      "node_id": "node_2285",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0015)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0025)]\n\nPerformance:\n  Mass: 109.71 kg\n  Factor of Safety: 0.51\n  Max Deflection: 1.19e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 109.7089935672177,
      "fos_buckling": 0.5099014259128662,
      "fos_yielding": 0.9769697296635752,
      "deflection": 0.011866230766888584,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.203)"
      },
      "parent_node_id": "node_2284",
      "improvement_over_parent": null
    },
    "node_2286": {
      "node_id": "node_2286",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0015)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0025)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n\nPerformance:\n  Mass: 120.11 kg\n  Factor of Safety: 0.70\n  Max Deflection: 1.00e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 120.11494358824537,
      "fos_buckling": 0.7021126268787126,
      "fos_yielding": 0.8627291750474559,
      "deflection": 0.01001530606364403,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.001969)"
      },
      "parent_node_id": "node_2285",
      "improvement_over_parent": null
    },
    "node_2287": {
      "node_id": "node_2287",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n\nPerformance:\n  Mass: 155.36 kg\n  Factor of Safety: 0.89\n  Max Deflection: 7.76e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.35608318869978,
      "fos_buckling": 0.8882397779293341,
      "fos_yielding": 1.1145909736210418,
      "deflection": 0.007756750594365169,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.307)"
      },
      "parent_node_id": "node_2286",
      "improvement_over_parent": null
    },
    "node_2288": {
      "node_id": "node_2288",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n\nPerformance:\n  Mass: 199.83 kg\n  Factor of Safety: 1.11\n  Max Deflection: 6.04e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.82642434590923,
      "fos_buckling": 1.1104567240019132,
      "fos_yielding": 1.4315722104897943,
      "deflection": 0.006043481032459129,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_2287",
      "improvement_over_parent": null
    },
    "node_2289": {
      "node_id": "node_2289",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 241.34 kg\n  Factor of Safety: 1.31\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.34404835026623,
      "fos_buckling": 1.3053049207874525,
      "fos_yielding": 1.7266420704379495,
      "deflection": 0.0050137471317801665,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_2288",
      "improvement_over_parent": null
    },
    "node_2290": {
      "node_id": "node_2290",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 281.46 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.31e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.4559399632612,
      "fos_buckling": 1.4821131563521137,
      "fos_yielding": 2.010907520891956,
      "deflection": 0.0043073233155538695,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.182)"
      },
      "parent_node_id": "node_2289",
      "improvement_over_parent": null
    },
    "node_2291": {
      "node_id": "node_2291",
      "content": "MODIFICATION: Increase 0 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 292.61 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.05e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.6115207470867,
      "fos_buckling": 1.5204466542110664,
      "fos_yielding": 2.008295901561929,
      "deflection": 0.004049183874724711,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.538)"
      },
      "parent_node_id": "node_2290",
      "improvement_over_parent": null
    },
    "node_2292": {
      "node_id": "node_2292",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2291",
      "improvement_over_parent": null
    },
    "node_2293": {
      "node_id": "node_2293",
      "content": "INITIAL DESIGN (Trace 329)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 216.84 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.41e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.84428364814454,
      "fos_buckling": 1.098534841455635,
      "fos_yielding": 1.5532529275182831,
      "deflection": 0.005408358606158988,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2294": {
      "node_id": "node_2294",
      "content": "MODIFICATION: Increase 3 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 222.94 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.29e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.94209425478329,
      "fos_buckling": 1.2127301949112579,
      "fos_yielding": 1.5325106256404968,
      "deflection": 0.005292913261299392,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.524)"
      },
      "parent_node_id": "node_2293",
      "improvement_over_parent": null
    },
    "node_2295": {
      "node_id": "node_2295",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 260.15 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.55e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.1493650518051,
      "fos_buckling": 1.381168844760257,
      "fos_yielding": 1.7867746700281348,
      "deflection": 0.004545719870182622,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.181)"
      },
      "parent_node_id": "node_2294",
      "improvement_over_parent": null
    },
    "node_2296": {
      "node_id": "node_2296",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.29 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.29491540483264,
      "fos_buckling": 1.5231751421489337,
      "fos_yielding": 2.0129231104250023,
      "deflection": 0.0040397577756491766,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.140)"
      },
      "parent_node_id": "node_2295",
      "improvement_over_parent": null
    },
    "node_2297": {
      "node_id": "node_2297",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2296",
      "improvement_over_parent": null
    },
    "node_2298": {
      "node_id": "node_2298",
      "content": "INITIAL DESIGN (Trace 330)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 137.66 kg\n  Factor of Safety: 0.62\n  Max Deflection: 1.04e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 137.6646022285506,
      "fos_buckling": 0.6202909429481251,
      "fos_yielding": 1.297436299482834,
      "deflection": 0.010389740188134005,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2299": {
      "node_id": "node_2299",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n\nPerformance:\n  Mass: 152.34 kg\n  Factor of Safety: 0.66\n  Max Deflection: 8.50e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.33922635016575,
      "fos_buckling": 0.6600179275429225,
      "fos_yielding": 1.297436299482834,
      "deflection": 0.008501688029306587,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002727)"
      },
      "parent_node_id": "node_2298",
      "improvement_over_parent": null
    },
    "node_2300": {
      "node_id": "node_2300",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n\nPerformance:\n  Mass: 185.76 kg\n  Factor of Safety: 0.79\n  Max Deflection: 6.99e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.75562965774895,
      "fos_buckling": 0.7863307549436098,
      "fos_yielding": 1.581535057765251,
      "deflection": 0.00698696642160687,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.233)"
      },
      "parent_node_id": "node_2299",
      "improvement_over_parent": null
    },
    "node_2301": {
      "node_id": "node_2301",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n\nPerformance:\n  Mass: 202.60 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.82e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 202.60451789816463,
      "fos_buckling": 1.1166130483271821,
      "fos_yielding": 1.3933318278891729,
      "deflection": 0.005817350196935939,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003263)"
      },
      "parent_node_id": "node_2300",
      "improvement_over_parent": null
    },
    "node_2302": {
      "node_id": "node_2302",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 243.03 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.03040009519538,
      "fos_buckling": 1.3048724223381998,
      "fos_yielding": 1.6698212744268124,
      "deflection": 0.004861100537237868,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.215)"
      },
      "parent_node_id": "node_2301",
      "improvement_over_parent": null
    },
    "node_2303": {
      "node_id": "node_2303",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 292.83 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.05e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.8305773884658,
      "fos_buckling": 1.5212520765308182,
      "fos_yielding": 2.009733302621702,
      "deflection": 0.0040460671830606,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.225)"
      },
      "parent_node_id": "node_2302",
      "improvement_over_parent": null
    },
    "node_2304": {
      "node_id": "node_2304",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2303",
      "improvement_over_parent": null
    },
    "node_2305": {
      "node_id": "node_2305",
      "content": "INITIAL DESIGN (Trace 331)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 182.22 kg\n  Factor of Safety: 0.31\n  Max Deflection: 5.17e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.22274018171345,
      "fos_buckling": 0.31403463521652275,
      "fos_yielding": 0.60803233649086,
      "deflection": 51717057995167.71,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2306": {
      "node_id": "node_2306",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 186.82 kg\n  Factor of Safety: 0.53\n  Max Deflection: 8.86e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.82234544225633,
      "fos_buckling": 0.5322248028318167,
      "fos_yielding": 1.5577401751927735,
      "deflection": 0.008864482513541322,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002883)"
      },
      "parent_node_id": "node_2305",
      "improvement_over_parent": null
    },
    "node_2307": {
      "node_id": "node_2307",
      "content": "MODIFICATION: Increase 6 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0062)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 195.18 kg\n  Factor of Safety: 0.53\n  Max Deflection: 8.33e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.17593211060293,
      "fos_buckling": 0.531918806373257,
      "fos_yielding": 1.5577401751927735,
      "deflection": 0.008334144812138405,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.321)"
      },
      "parent_node_id": "node_2306",
      "improvement_over_parent": null
    },
    "node_2308": {
      "node_id": "node_2308",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0071)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 221.19 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.37e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.1924383939668,
      "fos_buckling": 0.5895082796421628,
      "fos_yielding": 1.7710184273141452,
      "deflection": 0.0073692768919533394,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.147)"
      },
      "parent_node_id": "node_2307",
      "improvement_over_parent": null
    },
    "node_2309": {
      "node_id": "node_2309",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0071)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 264.39 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.87e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.390496331419,
      "fos_buckling": 1.0723190809851446,
      "fos_yielding": 1.7710184273141452,
      "deflection": 0.004865342779773363,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2308",
      "improvement_over_parent": null
    },
    "node_2310": {
      "node_id": "node_2310",
      "content": "MODIFICATION: Increase 0 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0071)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 269.31 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.78e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 269.3127853798811,
      "fos_buckling": 1.071957618514704,
      "fos_yielding": 1.7710184273141452,
      "deflection": 0.004784252163071434,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.186)"
      },
      "parent_node_id": "node_2309",
      "improvement_over_parent": null
    },
    "node_2311": {
      "node_id": "node_2311",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0071)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 300.29 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.04e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 300.2913314289575,
      "fos_buckling": 1.3307615148896295,
      "fos_yielding": 1.5710442193731702,
      "deflection": 0.0040351819746833285,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2310",
      "improvement_over_parent": null
    },
    "node_2312": {
      "node_id": "node_2312",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2311",
      "improvement_over_parent": null
    },
    "node_2313": {
      "node_id": "node_2313",
      "content": "INITIAL DESIGN (Trace 332)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 207.97 kg\n  Factor of Safety: 0.79\n  Max Deflection: 8.37e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.97171853150263,
      "fos_buckling": 0.7868070529689811,
      "fos_yielding": 1.6849456803597829,
      "deflection": 0.00836736881047443,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2314": {
      "node_id": "node_2314",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n\nPerformance:\n  Mass: 210.49 kg\n  Factor of Safety: 0.96\n  Max Deflection: 5.77e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.4881864094048,
      "fos_buckling": 0.9623088259393158,
      "fos_yielding": 1.483768284102212,
      "deflection": 0.005766558956330614,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001521)"
      },
      "parent_node_id": "node_2313",
      "improvement_over_parent": null
    },
    "node_2315": {
      "node_id": "node_2315",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n\nPerformance:\n  Mass: 258.06 kg\n  Factor of Safety: 1.16\n  Max Deflection: 4.71e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.0578590203888,
      "fos_buckling": 1.1649774600572187,
      "fos_yielding": 1.8164825463626015,
      "deflection": 0.00471345468634345,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.245)"
      },
      "parent_node_id": "node_2314",
      "improvement_over_parent": null
    },
    "node_2316": {
      "node_id": "node_2316",
      "content": "MODIFICATION: Increase 1 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n\nPerformance:\n  Mass: 264.12 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.55e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.11509804966573,
      "fos_buckling": 1.21628911891715,
      "fos_yielding": 1.8366110230995583,
      "deflection": 0.004554168640303342,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.256)"
      },
      "parent_node_id": "node_2315",
      "improvement_over_parent": null
    },
    "node_2317": {
      "node_id": "node_2317",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n\nPerformance:\n  Mass: 291.52 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.52352061838127,
      "fos_buckling": 1.3327128852613808,
      "fos_yielding": 2.0257281573112937,
      "deflection": 0.004131578201621544,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.114)"
      },
      "parent_node_id": "node_2316",
      "improvement_over_parent": null
    },
    "node_2318": {
      "node_id": "node_2318",
      "content": "MODIFICATION: Increase 5 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0072)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n\nPerformance:\n  Mass: 296.37 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.07e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 296.3713118088406,
      "fos_buckling": 1.2872892846566157,
      "fos_yielding": 2.848331178883909,
      "deflection": 0.004071029815283011,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.567)"
      },
      "parent_node_id": "node_2317",
      "improvement_over_parent": null
    },
    "node_2319": {
      "node_id": "node_2319",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2318",
      "improvement_over_parent": null
    },
    "node_2320": {
      "node_id": "node_2320",
      "content": "INITIAL DESIGN (Trace 333)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2321": {
      "node_id": "node_2321",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 180.11 kg\n  Factor of Safety: 0.51\n  Max Deflection: 9.56e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.10660341216482,
      "fos_buckling": 0.5103800785963223,
      "fos_yielding": 1.409195687355005,
      "deflection": 0.009557985101067508,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004017)"
      },
      "parent_node_id": "node_2320",
      "improvement_over_parent": null
    },
    "node_2322": {
      "node_id": "node_2322",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 214.76 kg\n  Factor of Safety: 0.59\n  Max Deflection: 8.03e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.76174113808128,
      "fos_buckling": 0.5899071188193199,
      "fos_yielding": 1.6872555257637663,
      "deflection": 0.008030713744246907,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.211)"
      },
      "parent_node_id": "node_2321",
      "improvement_over_parent": null
    },
    "node_2323": {
      "node_id": "node_2323",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 245.74 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.57e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.74028718715763,
      "fos_buckling": 0.588653519616016,
      "fos_yielding": 1.492793387614411,
      "deflection": 0.007572293384009366,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2322",
      "improvement_over_parent": null
    },
    "node_2324": {
      "node_id": "node_2324",
      "content": "MODIFICATION: Increase 6 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0075)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 256.98 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.04e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.98298066449235,
      "fos_buckling": 0.5881998817042062,
      "fos_yielding": 1.4933360717942425,
      "deflection": 0.007037225523318433,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.391)"
      },
      "parent_node_id": "node_2323",
      "improvement_over_parent": null
    },
    "node_2325": {
      "node_id": "node_2325",
      "content": "MODIFICATION: Increase 5 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0075)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 260.55 kg\n  Factor of Safety: 0.59\n  Max Deflection: 6.97e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.5491843754195,
      "fos_buckling": 0.5881998817042062,
      "fos_yielding": 1.4572280013917245,
      "deflection": 0.006969794698258472,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.538)"
      },
      "parent_node_id": "node_2324",
      "improvement_over_parent": null
    },
    "node_2326": {
      "node_id": "node_2326",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0075)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 303.75 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 303.7472423128717,
      "fos_buckling": 1.291398091492323,
      "fos_yielding": 2.2129210109930626,
      "deflection": 0.004046507147401571,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2325",
      "improvement_over_parent": null
    },
    "node_2327": {
      "node_id": "node_2327",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2326",
      "improvement_over_parent": null
    },
    "node_2328": {
      "node_id": "node_2328",
      "content": "INITIAL DESIGN (Trace 334)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 149.16 kg\n  Factor of Safety: 0.67\n  Max Deflection: 9.52e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.15900576068034,
      "fos_buckling": 0.6710504202870039,
      "fos_yielding": 1.1390249421433685,
      "deflection": 0.009521157678947336,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2329": {
      "node_id": "node_2329",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 187.32 kg\n  Factor of Safety: 0.82\n  Max Deflection: 7.60e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.32153804852976,
      "fos_buckling": 0.8180819553386509,
      "fos_yielding": 1.4341847275146542,
      "deflection": 0.007604547105268268,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.274)"
      },
      "parent_node_id": "node_2328",
      "improvement_over_parent": null
    },
    "node_2330": {
      "node_id": "node_2330",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 240.95 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.94726814056884,
      "fos_buckling": 1.0079926901674006,
      "fos_yielding": 1.8521022417116657,
      "deflection": 0.005937374963529908,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.314)"
      },
      "parent_node_id": "node_2329",
      "improvement_over_parent": null
    },
    "node_2331": {
      "node_id": "node_2331",
      "content": "MODIFICATION: Increase 4 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 242.84 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.8436626731953,
      "fos_buckling": 1.0079926901674006,
      "fos_yielding": 2.2870323228471925,
      "deflection": 0.005937374963529908,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.258)"
      },
      "parent_node_id": "node_2330",
      "improvement_over_parent": null
    },
    "node_2332": {
      "node_id": "node_2332",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 268.74 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.7410998155851,
      "fos_buckling": 1.071733297273204,
      "fos_yielding": 2.287032322847193,
      "deflection": 0.004854805961752279,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2331",
      "improvement_over_parent": null
    },
    "node_2333": {
      "node_id": "node_2333",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.12 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1225717764172,
      "fos_buckling": 1.5224766916367645,
      "fos_yielding": 2.012309210590259,
      "deflection": 0.004042174053544115,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2332",
      "improvement_over_parent": null
    },
    "node_2334": {
      "node_id": "node_2334",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2333",
      "improvement_over_parent": null
    },
    "node_2335": {
      "node_id": "node_2335",
      "content": "INITIAL DESIGN (Trace 335)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 224.93 kg\n  Factor of Safety: 0.86\n  Max Deflection: 7.34e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.9293036704453,
      "fos_buckling": 0.8602780982749638,
      "fos_yielding": 1.8399959079685266,
      "deflection": 0.007335939848360184,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2336": {
      "node_id": "node_2336",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 229.10 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.11e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.10033873158628,
      "fos_buckling": 1.2273257355856535,
      "fos_yielding": 1.6271570009317737,
      "deflection": 0.005110250475274017,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002594)"
      },
      "parent_node_id": "node_2335",
      "improvement_over_parent": null
    },
    "node_2337": {
      "node_id": "node_2337",
      "content": "MODIFICATION: Increase 9 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0064)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 238.95 kg\n  Factor of Safety: 1.27\n  Max Deflection: 4.90e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.9523052764161,
      "fos_buckling": 1.2742989108450993,
      "fos_yielding": 1.647348412715479,
      "deflection": 0.004898801461791684,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.304)"
      },
      "parent_node_id": "node_2336",
      "improvement_over_parent": null
    },
    "node_2338": {
      "node_id": "node_2338",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0082)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 298.34 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.94e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 298.3365228520365,
      "fos_buckling": 1.5314234788821823,
      "fos_yielding": 2.0550494882981627,
      "deflection": 0.003937274034562723,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.274)"
      },
      "parent_node_id": "node_2337",
      "improvement_over_parent": null
    },
    "node_2339": {
      "node_id": "node_2339",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2338",
      "improvement_over_parent": null
    },
    "node_2340": {
      "node_id": "node_2340",
      "content": "INITIAL DESIGN (Trace 336)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2341": {
      "node_id": "node_2341",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 205.61 kg\n  Factor of Safety: 0.48\n  Max Deflection: 1.20e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.61382103227191,
      "fos_buckling": 0.4791060841389439,
      "fos_yielding": 1.1253073712763755,
      "deflection": 11977328342958.215,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2340",
      "improvement_over_parent": null
    },
    "node_2342": {
      "node_id": "node_2342",
      "content": "MODIFICATION: Increase 1 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 217.13 kg\n  Factor of Safety: 0.08\n  Max Deflection: 4.53e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.13060015360153,
      "fos_buckling": 0.08166960985734331,
      "fos_yielding": 0.29716758909337293,
      "deflection": 45277784183684.26,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.536)"
      },
      "parent_node_id": "node_2341",
      "improvement_over_parent": null
    },
    "node_2343": {
      "node_id": "node_2343",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 250.04 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.04313678521854,
      "fos_buckling": 0.5883780873673878,
      "fos_yielding": 1.900531882653321,
      "deflection": 0.007193734985530524,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2342",
      "improvement_over_parent": null
    },
    "node_2344": {
      "node_id": "node_2344",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.24119472267074,
      "fos_buckling": 1.5227923858536287,
      "fos_yielding": 2.012474552890266,
      "deflection": 0.004040450929344393,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2343",
      "improvement_over_parent": null
    },
    "node_2345": {
      "node_id": "node_2345",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2344",
      "improvement_over_parent": null
    },
    "node_2346": {
      "node_id": "node_2346",
      "content": "INITIAL DESIGN (Trace 337)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0018)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n\nPerformance:\n  Mass: 147.16 kg\n  Factor of Safety: 0.35\n  Max Deflection: 1.23e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.16277447321363,
      "fos_buckling": 0.34576560997526634,
      "fos_yielding": 0.9715613956370582,
      "deflection": 0.012298521393070647,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2347": {
      "node_id": "node_2347",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 188.94 kg\n  Factor of Safety: 0.43\n  Max Deflection: 9.60e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.94465651782843,
      "fos_buckling": 0.4295037718092287,
      "fos_yielding": 1.2451932218246653,
      "deflection": 0.009603932070440128,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_2346",
      "improvement_over_parent": null
    },
    "node_2348": {
      "node_id": "node_2348",
      "content": "MODIFICATION: Increase 2 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 196.51 kg\n  Factor of Safety: 0.43\n  Max Deflection: 9.49e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.51021826315508,
      "fos_buckling": 0.4292801344829236,
      "fos_yielding": 1.244991703061864,
      "deflection": 0.009487320915886497,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.629)"
      },
      "parent_node_id": "node_2347",
      "improvement_over_parent": null
    },
    "node_2349": {
      "node_id": "node_2349",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 248.78 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.77658425165185,
      "fos_buckling": 0.5218177353386149,
      "fos_yielding": 1.5735234691949898,
      "deflection": 0.007516242075707082,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.292)"
      },
      "parent_node_id": "node_2348",
      "improvement_over_parent": null
    },
    "node_2350": {
      "node_id": "node_2350",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.36 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3585154195977,
      "fos_buckling": 1.5230756499229277,
      "fos_yielding": 2.0135332336766294,
      "deflection": 0.004038893758591001,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2349",
      "improvement_over_parent": null
    },
    "node_2351": {
      "node_id": "node_2351",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2350",
      "improvement_over_parent": null
    },
    "node_2352": {
      "node_id": "node_2352",
      "content": "INITIAL DESIGN (Trace 338)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0022)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 157.80 kg\n  Factor of Safety: 0.92\n  Max Deflection: 7.60e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 157.79641822321196,
      "fos_buckling": 0.9213344428613589,
      "fos_yielding": 1.1040734531583818,
      "deflection": 0.00759514485783927,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2353": {
      "node_id": "node_2353",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 199.27 kg\n  Factor of Safety: 1.13\n  Max Deflection: 6.03e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.2687996098218,
      "fos_buckling": 1.1319542211516613,
      "fos_yielding": 1.3927214633261737,
      "deflection": 0.006027007775168425,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.279)"
      },
      "parent_node_id": "node_2352",
      "improvement_over_parent": null
    },
    "node_2354": {
      "node_id": "node_2354",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 253.04 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.76e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.04027819209273,
      "fos_buckling": 1.3858332192957414,
      "fos_yielding": 1.766011890670901,
      "deflection": 0.004758993447601885,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.292)"
      },
      "parent_node_id": "node_2353",
      "improvement_over_parent": null
    },
    "node_2355": {
      "node_id": "node_2355",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 283.75 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.25e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 283.75093894889335,
      "fos_buckling": 1.5211886393939442,
      "fos_yielding": 1.9787196674723,
      "deflection": 0.004250351448941371,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.133)"
      },
      "parent_node_id": "node_2354",
      "improvement_over_parent": null
    },
    "node_2356": {
      "node_id": "node_2356",
      "content": "MODIFICATION: Increase 1 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.18 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1757991440328,
      "fos_buckling": 1.5223559710078505,
      "fos_yielding": 2.011994774505306,
      "deflection": 0.004041273866945459,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.403)"
      },
      "parent_node_id": "node_2355",
      "improvement_over_parent": null
    },
    "node_2357": {
      "node_id": "node_2357",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2356",
      "improvement_over_parent": null
    },
    "node_2358": {
      "node_id": "node_2358",
      "content": "INITIAL DESIGN (Trace 339)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 159.66 kg\n  Factor of Safety: 0.38\n  Max Deflection: 3.01e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.65988829965028,
      "fos_buckling": 0.378318701524807,
      "fos_yielding": 1.2940570817496198,
      "deflection": 0.03014701739946757,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2359": {
      "node_id": "node_2359",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 200.29 kg\n  Factor of Safety: 0.46\n  Max Deflection: 2.41e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.28628466265445,
      "fos_buckling": 0.4606069786121158,
      "fos_yielding": 1.619008661515546,
      "deflection": 0.0240617526780101,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.274)"
      },
      "parent_node_id": "node_2358",
      "improvement_over_parent": null
    },
    "node_2360": {
      "node_id": "node_2360",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 204.71 kg\n  Factor of Safety: 0.51\n  Max Deflection: 9.20e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.7132583445528,
      "fos_buckling": 0.5147903375805586,
      "fos_yielding": 1.4475147443656604,
      "deflection": 0.009198282428188518,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002766)"
      },
      "parent_node_id": "node_2359",
      "improvement_over_parent": null
    },
    "node_2361": {
      "node_id": "node_2361",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 241.17 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.82e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.17412807210093,
      "fos_buckling": 0.5887223461810398,
      "fos_yielding": 1.707693810043888,
      "deflection": 0.007817614408600152,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.195)"
      },
      "parent_node_id": "node_2360",
      "improvement_over_parent": null
    },
    "node_2362": {
      "node_id": "node_2362",
      "content": "MODIFICATION: Increase 6 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0050)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 246.41 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.36e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.40964980611125,
      "fos_buckling": 0.5885109284708333,
      "fos_yielding": 1.7075871223002408,
      "deflection": 0.007361596313238515,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.222)"
      },
      "parent_node_id": "node_2361",
      "improvement_over_parent": null
    },
    "node_2363": {
      "node_id": "node_2363",
      "content": "MODIFICATION: Increase 7 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0050)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0068)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 254.79 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.32e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.79094677417262,
      "fos_buckling": 0.5881727958739141,
      "fos_yielding": 1.6954413111640134,
      "deflection": 0.007324425122076325,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.307)"
      },
      "parent_node_id": "node_2362",
      "improvement_over_parent": null
    },
    "node_2364": {
      "node_id": "node_2364",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0050)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0068)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 297.99 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 297.98900471162483,
      "fos_buckling": 1.3998015939165473,
      "fos_yielding": 1.6691603269626305,
      "deflection": 0.004046527227370687,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2363",
      "improvement_over_parent": null
    },
    "node_2365": {
      "node_id": "node_2365",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2364",
      "improvement_over_parent": null
    },
    "node_2366": {
      "node_id": "node_2366",
      "content": "INITIAL DESIGN (Trace 340)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 238.27 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.85e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.26970576176808,
      "fos_buckling": 1.008665013320631,
      "fos_yielding": 1.9644555418927026,
      "deflection": 0.005847073903671523,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2367": {
      "node_id": "node_2367",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 271.18 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.51e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 271.1822423933851,
      "fos_buckling": 1.264190426274351,
      "fos_yielding": 1.9786300671055042,
      "deflection": 0.004507587471509219,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2366",
      "improvement_over_parent": null
    },
    "node_2368": {
      "node_id": "node_2368",
      "content": "MODIFICATION: Increase 10 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0074)]\n\nPerformance:\n  Mass: 282.09 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.42e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.09222076399084,
      "fos_buckling": 1.2609259859413455,
      "fos_yielding": 1.979375916029675,
      "deflection": 0.004418465984997838,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.379)"
      },
      "parent_node_id": "node_2367",
      "improvement_over_parent": null
    },
    "node_2369": {
      "node_id": "node_2369",
      "content": "MODIFICATION: Increase 0 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0074)]\n\nPerformance:\n  Mass: 292.68 kg\n  Factor of Safety: 1.27\n  Max Deflection: 4.20e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.68362839536167,
      "fos_buckling": 1.2651971529996835,
      "fos_yielding": 1.9770807323489301,
      "deflection": 0.004198098949457867,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.497)"
      },
      "parent_node_id": "node_2368",
      "improvement_over_parent": null
    },
    "node_2370": {
      "node_id": "node_2370",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2369",
      "improvement_over_parent": null
    },
    "node_2371": {
      "node_id": "node_2371",
      "content": "INITIAL DESIGN (Trace 341)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 250.90 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.89625598606014,
      "fos_buckling": 1.008152097442567,
      "fos_yielding": 2.269594035616629,
      "deflection": 0.005880228622286514,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2372": {
      "node_id": "node_2372",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 256.11 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.11008601987425,
      "fos_buckling": 1.007431413348156,
      "fos_yielding": 1.9987385190595701,
      "deflection": 0.005005673212415693,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2371",
      "improvement_over_parent": null
    },
    "node_2373": {
      "node_id": "node_2373",
      "content": "MODIFICATION: Increase 2 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 260.34 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.33671426585937,
      "fos_buckling": 1.0071395928902838,
      "fos_yielding": 1.9986521918969795,
      "deflection": 0.005007071774221107,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.214)"
      },
      "parent_node_id": "node_2372",
      "improvement_over_parent": null
    },
    "node_2374": {
      "node_id": "node_2374",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2492508974764,
      "fos_buckling": 1.5228695920784674,
      "fos_yielding": 2.0124454689204447,
      "deflection": 0.0040405079607461775,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2373",
      "improvement_over_parent": null
    },
    "node_2375": {
      "node_id": "node_2375",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2374",
      "improvement_over_parent": null
    },
    "node_2376": {
      "node_id": "node_2376",
      "content": "INITIAL DESIGN (Trace 342)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n\nPerformance:\n  Mass: 144.29 kg\n  Factor of Safety: 0.37\n  Max Deflection: 1.26e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 144.2871442826991,
      "fos_buckling": 0.36877064395671155,
      "fos_yielding": 1.0442581366985817,
      "deflection": 0.012616377269789977,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2377": {
      "node_id": "node_2377",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 179.83 kg\n  Factor of Safety: 0.45\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.83111556665958,
      "fos_buckling": 0.44519316123752023,
      "fos_yielding": 1.2978456729622596,
      "deflection": 0.01014324398237069,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.263)"
      },
      "parent_node_id": "node_2376",
      "improvement_over_parent": null
    },
    "node_2378": {
      "node_id": "node_2378",
      "content": "MODIFICATION: Increase 9 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 184.88 kg\n  Factor of Safety: 0.45\n  Max Deflection: 9.47e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.88452614438413,
      "fos_buckling": 0.4450382166143839,
      "fos_yielding": 1.2974247314465155,
      "deflection": 0.009473448302884449,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.266)"
      },
      "parent_node_id": "node_2377",
      "improvement_over_parent": null
    },
    "node_2379": {
      "node_id": "node_2379",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 221.58 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.54e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.57500954505872,
      "fos_buckling": 1.0276192188290825,
      "fos_yielding": 1.6280306020983222,
      "deflection": 0.005540719590343203,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005068)"
      },
      "parent_node_id": "node_2378",
      "improvement_over_parent": null
    },
    "node_2380": {
      "node_id": "node_2380",
      "content": "MODIFICATION: Increase 7 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 230.90 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.26e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.90496613694063,
      "fos_buckling": 1.067675273941658,
      "fos_yielding": 1.626379081708985,
      "deflection": 0.005262132395649837,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.383)"
      },
      "parent_node_id": "node_2379",
      "improvement_over_parent": null
    },
    "node_2381": {
      "node_id": "node_2381",
      "content": "MODIFICATION: Increase 4 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 232.64 kg\n  Factor of Safety: 1.28\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.64253418328832,
      "fos_buckling": 1.2794108171189942,
      "fos_yielding": 1.6270308168312937,
      "deflection": 0.00519152633734568,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.460)"
      },
      "parent_node_id": "node_2380",
      "improvement_over_parent": null
    },
    "node_2382": {
      "node_id": "node_2382",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.78 kg\n  Factor of Safety: 1.50\n  Max Deflection: 4.28e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 282.78060879466443,
      "fos_buckling": 1.5038995306412413,
      "fos_yielding": 1.975028798400089,
      "deflection": 0.0042812670259591195,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.236)"
      },
      "parent_node_id": "node_2381",
      "improvement_over_parent": null
    },
    "node_2383": {
      "node_id": "node_2383",
      "content": "MODIFICATION: Increase 1 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.32 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.32351111770686,
      "fos_buckling": 1.5227919003445025,
      "fos_yielding": 2.0134686374049164,
      "deflection": 0.004039417741290231,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.471)"
      },
      "parent_node_id": "node_2382",
      "improvement_over_parent": null
    },
    "node_2384": {
      "node_id": "node_2384",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2383",
      "improvement_over_parent": null
    },
    "node_2385": {
      "node_id": "node_2385",
      "content": "INITIAL DESIGN (Trace 343)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 182.14 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.66e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.14060065139157,
      "fos_buckling": 0.8836548010449549,
      "fos_yielding": 1.4315107834774679,
      "deflection": 0.0066562916994403155,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2386": {
      "node_id": "node_2386",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 213.33 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.69e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.3285268973033,
      "fos_buckling": 1.0211739165842542,
      "fos_yielding": 1.6733726073740907,
      "deflection": 0.005690953331387288,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.183)"
      },
      "parent_node_id": "node_2385",
      "improvement_over_parent": null
    },
    "node_2387": {
      "node_id": "node_2387",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 256.54 kg\n  Factor of Safety: 1.21\n  Max Deflection: 4.74e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.5411605213019,
      "fos_buckling": 1.205001838552256,
      "fos_yielding": 2.006743177044902,
      "deflection": 0.0047411880246680475,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.220)"
      },
      "parent_node_id": "node_2386",
      "improvement_over_parent": null
    },
    "node_2388": {
      "node_id": "node_2388",
      "content": "MODIFICATION: Increase 3 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 263.07 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.66e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.07219010265555,
      "fos_buckling": 1.2018727230592328,
      "fos_yielding": 1.9850064807646326,
      "deflection": 0.004658799022382709,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.401)"
      },
      "parent_node_id": "node_2387",
      "improvement_over_parent": null
    },
    "node_2389": {
      "node_id": "node_2389",
      "content": "MODIFICATION: Increase 7 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 278.57 kg\n  Factor of Safety: 1.55\n  Max Deflection: 4.35e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 278.5714954375064,
      "fos_buckling": 1.5504305767498294,
      "fos_yielding": 1.98210943261977,
      "deflection": 0.00434909606298969,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.613)"
      },
      "parent_node_id": "node_2388",
      "improvement_over_parent": null
    },
    "node_2390": {
      "node_id": "node_2390",
      "content": "MODIFICATION: Increase 0 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 284.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.24e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 284.2618416167453,
      "fos_buckling": 1.5224442625766603,
      "fos_yielding": 1.9810390508748952,
      "deflection": 0.004237625448905041,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.221)"
      },
      "parent_node_id": "node_2389",
      "improvement_over_parent": null
    },
    "node_2391": {
      "node_id": "node_2391",
      "content": "MODIFICATION: Increase 1 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.26404448606263,
      "fos_buckling": 1.5231164337465255,
      "fos_yielding": 2.012497198242247,
      "deflection": 0.004040312541920018,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.379)"
      },
      "parent_node_id": "node_2390",
      "improvement_over_parent": null
    },
    "node_2392": {
      "node_id": "node_2392",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2391",
      "improvement_over_parent": null
    },
    "node_2393": {
      "node_id": "node_2393",
      "content": "INITIAL DESIGN (Trace 344)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 200.29 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.84e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.29187070433346,
      "fos_buckling": 0.5155003750432825,
      "fos_yielding": 1.6199453746828842,
      "deflection": 0.008837748731594049,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2394": {
      "node_id": "node_2394",
      "content": "MODIFICATION: Increase 9 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 212.56 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.44e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.56258131897917,
      "fos_buckling": 0.5150654880709241,
      "fos_yielding": 1.619218330460743,
      "deflection": 0.008443411802820955,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.517)"
      },
      "parent_node_id": "node_2393",
      "improvement_over_parent": null
    },
    "node_2395": {
      "node_id": "node_2395",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 249.91 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.20e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.9137150762134,
      "fos_buckling": 0.5882452554463821,
      "fos_yielding": 1.8999000870865141,
      "deflection": 0.007197001106015611,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.193)"
      },
      "parent_node_id": "node_2394",
      "improvement_over_parent": null
    },
    "node_2396": {
      "node_id": "node_2396",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.11 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.11177301366564,
      "fos_buckling": 1.521828881831573,
      "fos_yielding": 2.0116823143857627,
      "deflection": 0.004042279612478924,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2395",
      "improvement_over_parent": null
    },
    "node_2397": {
      "node_id": "node_2397",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2396",
      "improvement_over_parent": null
    },
    "node_2398": {
      "node_id": "node_2398",
      "content": "INITIAL DESIGN (Trace 345)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0021)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 152.47 kg\n  Factor of Safety: 0.65\n  Max Deflection: 8.80e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.46788251789536,
      "fos_buckling": 0.6516153952092562,
      "fos_yielding": 1.1714934983163061,
      "deflection": 0.008802905271947008,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2399": {
      "node_id": "node_2399",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 177.05 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.59e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.05043121927142,
      "fos_buckling": 0.7429874417048661,
      "fos_yielding": 1.3593945489355674,
      "deflection": 0.0075907537323811275,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_2398",
      "improvement_over_parent": null
    },
    "node_2400": {
      "node_id": "node_2400",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 222.32 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.06e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.32424414259066,
      "fos_buckling": 0.9014918320000729,
      "fos_yielding": 1.7047273365291733,
      "deflection": 0.006059700183608032,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.276)"
      },
      "parent_node_id": "node_2399",
      "improvement_over_parent": null
    },
    "node_2401": {
      "node_id": "node_2401",
      "content": "MODIFICATION: Increase 1 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 233.34 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.73e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.3436096070642,
      "fos_buckling": 0.9008098326027509,
      "fos_yielding": 1.7456819288216703,
      "deflection": 0.005726149347388694,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.608)"
      },
      "parent_node_id": "node_2400",
      "improvement_over_parent": null
    },
    "node_2402": {
      "node_id": "node_2402",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n\nPerformance:\n  Mass: 255.94 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.62e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.94076218702114,
      "fos_buckling": 1.3625378744870362,
      "fos_yielding": 1.758052762304818,
      "deflection": 0.004619252287760234,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004319)"
      },
      "parent_node_id": "node_2401",
      "improvement_over_parent": null
    },
    "node_2403": {
      "node_id": "node_2403",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.21 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.21476154884533,
      "fos_buckling": 1.5227764181919237,
      "fos_yielding": 2.012395969968429,
      "deflection": 0.004040767833056396,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.160)"
      },
      "parent_node_id": "node_2402",
      "improvement_over_parent": null
    },
    "node_2404": {
      "node_id": "node_2404",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2403",
      "improvement_over_parent": null
    },
    "node_2405": {
      "node_id": "node_2405",
      "content": "INITIAL DESIGN (Trace 346)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 273.86 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.41e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 273.856409076102,
      "fos_buckling": 1.3083068151684856,
      "fos_yielding": 1.983825565018566,
      "deflection": 0.004414603203825083,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2406": {
      "node_id": "node_2406",
      "content": "MODIFICATION: Increase 10 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 283.52 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.23e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.5216695214351,
      "fos_buckling": 1.3160703468833799,
      "fos_yielding": 2.0132828990479146,
      "deflection": 0.004230619238134856,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.304)"
      },
      "parent_node_id": "node_2405",
      "improvement_over_parent": null
    },
    "node_2407": {
      "node_id": "node_2407",
      "content": "MODIFICATION: Increase 7 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 291.61 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.609477336972,
      "fos_buckling": 1.3715122746290898,
      "fos_yielding": 2.011792191011593,
      "deflection": 0.004081419445274747,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.253)"
      },
      "parent_node_id": "node_2406",
      "improvement_over_parent": null
    },
    "node_2408": {
      "node_id": "node_2408",
      "content": "MODIFICATION: Increase 4 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.20485696527066,
      "fos_buckling": 1.5225486849505057,
      "fos_yielding": 2.012402710422673,
      "deflection": 0.004041007113497964,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.321)"
      },
      "parent_node_id": "node_2407",
      "improvement_over_parent": null
    },
    "node_2409": {
      "node_id": "node_2409",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2408",
      "improvement_over_parent": null
    },
    "node_2410": {
      "node_id": "node_2410",
      "content": "INITIAL DESIGN (Trace 347)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 198.29 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.39e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.2899716610072,
      "fos_buckling": 0.8502364726256608,
      "fos_yielding": 1.7309706874168267,
      "deflection": 0.006390263984139022,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2411": {
      "node_id": "node_2411",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 225.97 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.62e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.97152680752785,
      "fos_buckling": 0.9495369252423229,
      "fos_yielding": 1.972171991002137,
      "deflection": 0.005617276840604364,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.151)"
      },
      "parent_node_id": "node_2410",
      "improvement_over_parent": null
    },
    "node_2412": {
      "node_id": "node_2412",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.18 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.1765995036025,
      "fos_buckling": 1.0723650618289156,
      "fos_yielding": 2.287478318950683,
      "deflection": 0.004852635043444354,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.176)"
      },
      "parent_node_id": "node_2411",
      "improvement_over_parent": null
    },
    "node_2413": {
      "node_id": "node_2413",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 281.90 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.16e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.90368684436606,
      "fos_buckling": 1.4369597497081308,
      "fos_yielding": 2.048082553178685,
      "deflection": 0.004156028152941121,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003213)"
      },
      "parent_node_id": "node_2412",
      "improvement_over_parent": null
    },
    "node_2414": {
      "node_id": "node_2414",
      "content": "MODIFICATION: Increase 9 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0102)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 305.68 kg\n  Factor of Safety: 1.54\n  Max Deflection: 3.86e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 305.6808104883046,
      "fos_buckling": 1.5356811997844597,
      "fos_yielding": 2.088450864214382,
      "deflection": 0.0038613730977523427,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.626)"
      },
      "parent_node_id": "node_2413",
      "improvement_over_parent": null
    },
    "node_2415": {
      "node_id": "node_2415",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2414",
      "improvement_over_parent": null
    },
    "node_2416": {
      "node_id": "node_2416",
      "content": "INITIAL DESIGN (Trace 348)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 151.54 kg\n  Factor of Safety: 0.48\n  Max Deflection: 2.30e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.54001722627967,
      "fos_buckling": 0.4780558141451375,
      "fos_yielding": 0.5626536856381877,
      "deflection": 22977552017114.3,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2417": {
      "node_id": "node_2417",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n\nPerformance:\n  Mass: 173.62 kg\n  Factor of Safety: 0.52\n  Max Deflection: 9.75e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.62442696434377,
      "fos_buckling": 0.5177207601864584,
      "fos_yielding": 1.626217173128401,
      "deflection": 0.009750594851182333,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004213)"
      },
      "parent_node_id": "node_2416",
      "improvement_over_parent": null
    },
    "node_2418": {
      "node_id": "node_2418",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 200.04 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.74e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.04445735267112,
      "fos_buckling": 0.5167795613319931,
      "fos_yielding": 1.6246450129854295,
      "deflection": 0.008744228168133934,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004390)"
      },
      "parent_node_id": "node_2417",
      "improvement_over_parent": null
    },
    "node_2419": {
      "node_id": "node_2419",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 234.66 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.47e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.6597288226011,
      "fos_buckling": 0.5887589968612842,
      "fos_yielding": 1.9005728785079674,
      "deflection": 0.0074708368011719515,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.189)"
      },
      "parent_node_id": "node_2418",
      "improvement_over_parent": null
    },
    "node_2420": {
      "node_id": "node_2420",
      "content": "MODIFICATION: Increase 9 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0070)]\n\nPerformance:\n  Mass: 244.17 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.42e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.1685335160737,
      "fos_buckling": 0.5883748909658667,
      "fos_yielding": 1.8999130734017564,
      "deflection": 0.007418214815910117,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.350)"
      },
      "parent_node_id": "node_2419",
      "improvement_over_parent": null
    },
    "node_2421": {
      "node_id": "node_2421",
      "content": "MODIFICATION: Increase 3 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0048)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0070)]\n\nPerformance:\n  Mass: 245.71 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.31e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.7112590516719,
      "fos_buckling": 0.5883748909658667,
      "fos_yielding": 2.001600443542426,
      "deflection": 0.007314346576262585,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.247)"
      },
      "parent_node_id": "node_2420",
      "improvement_over_parent": null
    },
    "node_2422": {
      "node_id": "node_2422",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0048)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0070)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 288.91 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.22e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.90931698912414,
      "fos_buckling": 1.2774833546623263,
      "fos_yielding": 1.9746049394671907,
      "deflection": 0.004215234324087399,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2421",
      "improvement_over_parent": null
    },
    "node_2423": {
      "node_id": "node_2423",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2422",
      "improvement_over_parent": null
    },
    "node_2424": {
      "node_id": "node_2424",
      "content": "INITIAL DESIGN (Trace 349)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 155.14 kg\n  Factor of Safety: 0.65\n  Max Deflection: 8.33e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 155.1407240872967,
      "fos_buckling": 0.6518632576771219,
      "fos_yielding": 1.2042493536290628,
      "deflection": 0.008329560022775637,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2425": {
      "node_id": "node_2425",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 193.06 kg\n  Factor of Safety: 0.79\n  Max Deflection: 6.71e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.06353759882188,
      "fos_buckling": 0.7892138721338968,
      "fos_yielding": 1.4970810895203934,
      "deflection": 0.006709034639756363,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.261)"
      },
      "parent_node_id": "node_2424",
      "improvement_over_parent": null
    },
    "node_2426": {
      "node_id": "node_2426",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 224.12 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.79e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.12122085142326,
      "fos_buckling": 0.8953608931588107,
      "fos_yielding": 1.7364483751732671,
      "deflection": 0.005790356296017511,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.174)"
      },
      "parent_node_id": "node_2425",
      "improvement_over_parent": null
    },
    "node_2427": {
      "node_id": "node_2427",
      "content": "MODIFICATION: Increase 5 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 225.40 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.77e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.404244832601,
      "fos_buckling": 0.8952030728843079,
      "fos_yielding": 1.7320598225192039,
      "deflection": 0.005770084150605187,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.429)"
      },
      "parent_node_id": "node_2426",
      "improvement_over_parent": null
    },
    "node_2428": {
      "node_id": "node_2428",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n\nPerformance:\n  Mass: 253.92 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.66e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.91848786032827,
      "fos_buckling": 1.3535529988362993,
      "fos_yielding": 1.7440814039526589,
      "deflection": 0.004655684403126268,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004603)"
      },
      "parent_node_id": "node_2427",
      "improvement_over_parent": null
    },
    "node_2429": {
      "node_id": "node_2429",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.21 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.21181709378715,
      "fos_buckling": 1.522747780992056,
      "fos_yielding": 2.0121941562685186,
      "deflection": 0.004040969988570224,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_2428",
      "improvement_over_parent": null
    },
    "node_2430": {
      "node_id": "node_2430",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2429",
      "improvement_over_parent": null
    },
    "node_2431": {
      "node_id": "node_2431",
      "content": "INITIAL DESIGN (Trace 350)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 172.54 kg\n  Factor of Safety: 0.48\n  Max Deflection: 1.15e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.5392940559515,
      "fos_buckling": 0.4791060841389439,
      "fos_yielding": 1.1253073712763755,
      "deflection": 11502006884429.168,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2432": {
      "node_id": "node_2432",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 205.45 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.10e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.4518306875685,
      "fos_buckling": 0.5231250164836241,
      "fos_yielding": 1.3377205553178908,
      "deflection": 0.011033103996168282,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2431",
      "improvement_over_parent": null
    },
    "node_2433": {
      "node_id": "node_2433",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 248.65 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.6498886250207,
      "fos_buckling": 0.5215750443824605,
      "fos_yielding": 1.5726214050498375,
      "deflection": 0.007520389006916277,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2432",
      "improvement_over_parent": null
    },
    "node_2434": {
      "node_id": "node_2434",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2318197929666,
      "fos_buckling": 1.5229033450823217,
      "fos_yielding": 2.0124452183922426,
      "deflection": 0.0040406239177422885,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2433",
      "improvement_over_parent": null
    },
    "node_2435": {
      "node_id": "node_2435",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2434",
      "improvement_over_parent": null
    },
    "node_2436": {
      "node_id": "node_2436",
      "content": "INITIAL DESIGN (Trace 351)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0015)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 226.12 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.42e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.11593382915478,
      "fos_buckling": 0.8265356084681115,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.006421769044843955,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2437": {
      "node_id": "node_2437",
      "content": "MODIFICATION: Increase 2 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 228.93 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.31e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.9258134760696,
      "fos_buckling": 0.9423563205175193,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.006305579346284979,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.357)"
      },
      "parent_node_id": "node_2436",
      "improvement_over_parent": null
    },
    "node_2438": {
      "node_id": "node_2438",
      "content": "MODIFICATION: Increase 2 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 234.51 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.16e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.50857041818134,
      "fos_buckling": 0.9419951273879601,
      "fos_yielding": 2.287133993359742,
      "deflection": 0.006155276813841518,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.538)"
      },
      "parent_node_id": "node_2437",
      "improvement_over_parent": null
    },
    "node_2439": {
      "node_id": "node_2439",
      "content": "MODIFICATION: Increase 9 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 241.03 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.89e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.02514842898714,
      "fos_buckling": 1.0743981153118736,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.005890423710736644,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.188)"
      },
      "parent_node_id": "node_2438",
      "improvement_over_parent": null
    },
    "node_2440": {
      "node_id": "node_2440",
      "content": "MODIFICATION: Increase 0 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 246.39 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.78e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.39344045230317,
      "fos_buckling": 1.0740024547534228,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.005778760193418452,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.206)"
      },
      "parent_node_id": "node_2439",
      "improvement_over_parent": null
    },
    "node_2441": {
      "node_id": "node_2441",
      "content": "MODIFICATION: Increase 1 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 259.53 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.98e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.52916895448817,
      "fos_buckling": 1.0730355367244835,
      "fos_yielding": 2.287133993359742,
      "deflection": 0.004975966015701232,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.656)"
      },
      "parent_node_id": "node_2440",
      "improvement_over_parent": null
    },
    "node_2442": {
      "node_id": "node_2442",
      "content": "MODIFICATION: Increase 2 thickness by 62%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.86 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.85564700933367,
      "fos_buckling": 1.0723500729961066,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.0048518059879727,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.618)"
      },
      "parent_node_id": "node_2441",
      "improvement_over_parent": null
    },
    "node_2443": {
      "node_id": "node_2443",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.23711897016574,
      "fos_buckling": 1.5230156775087793,
      "fos_yielding": 2.0125221731397938,
      "deflection": 0.004040270070479945,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2442",
      "improvement_over_parent": null
    },
    "node_2444": {
      "node_id": "node_2444",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2443",
      "improvement_over_parent": null
    },
    "node_2445": {
      "node_id": "node_2445",
      "content": "INITIAL DESIGN (Trace 352)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0023)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 147.39 kg\n  Factor of Safety: 0.73\n  Max Deflection: 1.76e+11 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.393740927522,
      "fos_buckling": 0.7291932268194896,
      "fos_yielding": 1.5477029423803417,
      "deflection": 176430914198.94205,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2446": {
      "node_id": "node_2446",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 183.58 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.65e+11 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.57638574152293,
      "fos_buckling": 0.880928478053915,
      "fos_yielding": 1.9114216666560213,
      "deflection": 765123690159.5326,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.264)"
      },
      "parent_node_id": "node_2445",
      "improvement_over_parent": null
    },
    "node_2447": {
      "node_id": "node_2447",
      "content": "MODIFICATION: Increase 0 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 189.24 kg\n  Factor of Safety: 0.88\n  Max Deflection: 2.62e+12 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.24456071893013,
      "fos_buckling": 0.8809284780539152,
      "fos_yielding": 1.9257778705088442,
      "deflection": 2616209891591.2603,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.340)"
      },
      "parent_node_id": "node_2446",
      "improvement_over_parent": null
    },
    "node_2448": {
      "node_id": "node_2448",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 193.63 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.39e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.6344933757733,
      "fos_buckling": 0.8755105614567333,
      "fos_yielding": 1.9257778705088442,
      "deflection": 0.007392359534332284,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002741)"
      },
      "parent_node_id": "node_2447",
      "improvement_over_parent": null
    },
    "node_2449": {
      "node_id": "node_2449",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 219.71 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.30e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.71468056494928,
      "fos_buckling": 0.8739415248246409,
      "fos_yielding": 1.6831317132193468,
      "deflection": 0.006304692227555674,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004329)"
      },
      "parent_node_id": "node_2448",
      "improvement_over_parent": null
    },
    "node_2450": {
      "node_id": "node_2450",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 261.02 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.32e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 261.0162509596649,
      "fos_buckling": 1.006428746826296,
      "fos_yielding": 1.9968336736227186,
      "deflection": 0.00531701349019581,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.206)"
      },
      "parent_node_id": "node_2449",
      "improvement_over_parent": null
    },
    "node_2451": {
      "node_id": "node_2451",
      "content": "MODIFICATION: Increase 0 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 267.15 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.1513995097198,
      "fos_buckling": 1.0060057752978389,
      "fos_yielding": 1.9966727706552865,
      "deflection": 0.005011668260006561,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.242)"
      },
      "parent_node_id": "node_2450",
      "improvement_over_parent": null
    },
    "node_2452": {
      "node_id": "node_2452",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.05 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.04883665210957,
      "fos_buckling": 1.522042011487215,
      "fos_yielding": 2.0107786340216465,
      "deflection": 0.004043154527988512,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2451",
      "improvement_over_parent": null
    },
    "node_2453": {
      "node_id": "node_2453",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2452",
      "improvement_over_parent": null
    },
    "node_2454": {
      "node_id": "node_2454",
      "content": "INITIAL DESIGN (Trace 353)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0018)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 141.88 kg\n  Factor of Safety: 0.66\n  Max Deflection: 8.75e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.88084137641005,
      "fos_buckling": 0.6617167141437589,
      "fos_yielding": 1.3003864133934446,
      "deflection": 0.008746635418257943,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2455": {
      "node_id": "node_2455",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 171.87 kg\n  Factor of Safety: 0.78\n  Max Deflection: 7.23e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.87103980530193,
      "fos_buckling": 0.7837017740234066,
      "fos_yielding": 1.5742983312837384,
      "deflection": 0.007234614210204019,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_2454",
      "improvement_over_parent": null
    },
    "node_2456": {
      "node_id": "node_2456",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 201.68 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.18e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.68004993518505,
      "fos_buckling": 0.8988603624588347,
      "fos_yielding": 1.8461961980135688,
      "deflection": 0.0061773658958341,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.186)"
      },
      "parent_node_id": "node_2455",
      "improvement_over_parent": null
    },
    "node_2457": {
      "node_id": "node_2457",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 250.15 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.14908266615987,
      "fos_buckling": 1.0732557243987535,
      "fos_yielding": 2.287494132681832,
      "deflection": 0.004996283099876409,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.263)"
      },
      "parent_node_id": "node_2456",
      "improvement_over_parent": null
    },
    "node_2458": {
      "node_id": "node_2458",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 281.13 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.17e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.12762871523626,
      "fos_buckling": 1.4251734156965097,
      "fos_yielding": 2.010199457007256,
      "deflection": 0.004173156915263626,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2457",
      "improvement_over_parent": null
    },
    "node_2459": {
      "node_id": "node_2459",
      "content": "MODIFICATION: Increase 8 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1422284958986,
      "fos_buckling": 1.522618328798042,
      "fos_yielding": 2.011919204240355,
      "deflection": 0.004041784431503901,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.631)"
      },
      "parent_node_id": "node_2458",
      "improvement_over_parent": null
    },
    "node_2460": {
      "node_id": "node_2460",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2459",
      "improvement_over_parent": null
    },
    "node_2461": {
      "node_id": "node_2461",
      "content": "INITIAL DESIGN (Trace 354)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 223.02 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.49e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.0194131369732,
      "fos_buckling": 0.47862267729961716,
      "fos_yielding": 1.4162140086868438,
      "deflection": 0.008486333888467854,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2462": {
      "node_id": "node_2462",
      "content": "MODIFICATION: Increase 5 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 223.73 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.35e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.7337982663497,
      "fos_buckling": 0.47857569682945056,
      "fos_yielding": 1.416170761761507,
      "deflection": 0.008345897276692184,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.195)"
      },
      "parent_node_id": "node_2461",
      "improvement_over_parent": null
    },
    "node_2463": {
      "node_id": "node_2463",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 248.57 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.57304232387753,
      "fos_buckling": 0.5214518572849586,
      "fos_yielding": 1.5721625241613515,
      "deflection": 0.007522446473483559,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.122)"
      },
      "parent_node_id": "node_2462",
      "improvement_over_parent": null
    },
    "node_2464": {
      "node_id": "node_2464",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.15 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1549734918234,
      "fos_buckling": 1.5228362533542839,
      "fos_yielding": 2.0118842253746503,
      "deflection": 0.004041596490880975,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2463",
      "improvement_over_parent": null
    },
    "node_2465": {
      "node_id": "node_2465",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2464",
      "improvement_over_parent": null
    },
    "node_2466": {
      "node_id": "node_2466",
      "content": "INITIAL DESIGN (Trace 355)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 174.35 kg\n  Factor of Safety: 0.69\n  Max Deflection: 9.42e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.35157154976352,
      "fos_buckling": 0.687923902179638,
      "fos_yielding": 1.6108352312996777,
      "deflection": 0.009422497814669462,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2467": {
      "node_id": "node_2467",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n\nPerformance:\n  Mass: 178.02 kg\n  Factor of Safety: 0.69\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.0213298518728,
      "fos_buckling": 0.6875759926070417,
      "fos_yielding": 1.610835231299678,
      "deflection": 0.007523243508507171,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002262)"
      },
      "parent_node_id": "node_2466",
      "improvement_over_parent": null
    },
    "node_2468": {
      "node_id": "node_2468",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 200.49 kg\n  Factor of Safety: 0.76\n  Max Deflection: 6.69e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.49425235726795,
      "fos_buckling": 0.7641484341892923,
      "fos_yielding": 1.8129675279042,
      "deflection": 0.006687149570444194,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.135)"
      },
      "parent_node_id": "node_2467",
      "improvement_over_parent": null
    },
    "node_2469": {
      "node_id": "node_2469",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 253.19 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.31e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.19175660111995,
      "fos_buckling": 0.9347789427925804,
      "fos_yielding": 2.285755150901219,
      "deflection": 0.00530842018855777,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.287)"
      },
      "parent_node_id": "node_2468",
      "improvement_over_parent": null
    },
    "node_2470": {
      "node_id": "node_2470",
      "content": "MODIFICATION: Increase 9 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0040)]\n\nPerformance:\n  Mass: 254.10 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.30e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.10218615390335,
      "fos_buckling": 0.9346622484710664,
      "fos_yielding": 2.2857551509012204,
      "deflection": 0.00529897478791463,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.196)"
      },
      "parent_node_id": "node_2469",
      "improvement_over_parent": null
    },
    "node_2471": {
      "node_id": "node_2471",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0040)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 278.48 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.32e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 278.4836581147355,
      "fos_buckling": 1.381905753262141,
      "fos_yielding": 1.9895313607713834,
      "deflection": 0.004317170600099576,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2470",
      "improvement_over_parent": null
    },
    "node_2472": {
      "node_id": "node_2472",
      "content": "MODIFICATION: Increase 0 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0040)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 287.20 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.20005574055006,
      "fos_buckling": 1.3848149887939163,
      "fos_yielding": 1.9879490993434483,
      "deflection": 0.004134032128204918,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.379)"
      },
      "parent_node_id": "node_2471",
      "improvement_over_parent": null
    },
    "node_2473": {
      "node_id": "node_2473",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2472",
      "improvement_over_parent": null
    },
    "node_2474": {
      "node_id": "node_2474",
      "content": "INITIAL DESIGN (Trace 356)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 163.82 kg\n  Factor of Safety: 0.49\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 163.8211501039204,
      "fos_buckling": 0.4911544731607233,
      "fos_yielding": 1.5288477370210682,
      "deflection": 0.010182402851856995,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2475": {
      "node_id": "node_2475",
      "content": "MODIFICATION: Increase 0 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 168.91 kg\n  Factor of Safety: 0.49\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.9085070250891,
      "fos_buckling": 0.49098217681760964,
      "fos_yielding": 1.5285627436442126,
      "deflection": 0.01018549758928721,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.247)"
      },
      "parent_node_id": "node_2474",
      "improvement_over_parent": null
    },
    "node_2476": {
      "node_id": "node_2476",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n\nPerformance:\n  Mass: 203.51 kg\n  Factor of Safety: 0.75\n  Max Deflection: 6.47e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.51439239438042,
      "fos_buckling": 0.7477111436274595,
      "fos_yielding": 1.8339807235726977,
      "deflection": 0.0064727268959133485,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004846)"
      },
      "parent_node_id": "node_2475",
      "improvement_over_parent": null
    },
    "node_2477": {
      "node_id": "node_2477",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 228.33 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.22e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.33441454360852,
      "fos_buckling": 1.110041071310821,
      "fos_yielding": 1.5950255522486323,
      "deflection": 0.005215209986430409,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004104)"
      },
      "parent_node_id": "node_2476",
      "improvement_over_parent": null
    },
    "node_2478": {
      "node_id": "node_2478",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 285.05 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.19e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.0510242624356,
      "fos_buckling": 1.346013661937529,
      "fos_yielding": 1.9880713990537178,
      "deflection": 0.004190229230330694,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_2477",
      "improvement_over_parent": null
    },
    "node_2479": {
      "node_id": "node_2479",
      "content": "MODIFICATION: Increase 10 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0065)]\n\nPerformance:\n  Mass: 291.70 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.6997834393911,
      "fos_buckling": 1.3803641004317848,
      "fos_yielding": 1.9739642168541414,
      "deflection": 0.0041390010894623306,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.242)"
      },
      "parent_node_id": "node_2478",
      "improvement_over_parent": null
    },
    "node_2480": {
      "node_id": "node_2480",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2479",
      "improvement_over_parent": null
    },
    "node_2481": {
      "node_id": "node_2481",
      "content": "INITIAL DESIGN (Trace 357)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2482": {
      "node_id": "node_2482",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 175.48 kg\n  Factor of Safety: 0.31\n  Max Deflection: 2.06e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.48284173647704,
      "fos_buckling": 0.30801273692562303,
      "fos_yielding": 1.0607559161446358,
      "deflection": 20611373490353.035,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2481",
      "improvement_over_parent": null
    },
    "node_2483": {
      "node_id": "node_2483",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 218.68 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.55e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.68089967392928,
      "fos_buckling": 1.0100681421127822,
      "fos_yielding": 2.288071782940979,
      "deflection": 0.006551455616357991,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2482",
      "improvement_over_parent": null
    },
    "node_2484": {
      "node_id": "node_2484",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 251.59 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.08e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.59343630554628,
      "fos_buckling": 1.0733937798373725,
      "fos_yielding": 2.288071782940979,
      "deflection": 0.005077887604343091,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2483",
      "improvement_over_parent": null
    },
    "node_2485": {
      "node_id": "node_2485",
      "content": "MODIFICATION: Increase 0 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 262.27 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.2678253560938,
      "fos_buckling": 1.072608633132765,
      "fos_yielding": 2.288071782940979,
      "deflection": 0.004851021895631717,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.502)"
      },
      "parent_node_id": "node_2484",
      "improvement_over_parent": null
    },
    "node_2486": {
      "node_id": "node_2486",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2463714051702,
      "fos_buckling": 1.522898156071948,
      "fos_yielding": 2.012446538878717,
      "deflection": 0.004040363544095476,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2485",
      "improvement_over_parent": null
    },
    "node_2487": {
      "node_id": "node_2487",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2486",
      "improvement_over_parent": null
    },
    "node_2488": {
      "node_id": "node_2488",
      "content": "INITIAL DESIGN (Trace 358)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 235.33 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.71e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.3266372004257,
      "fos_buckling": 0.5220521101437343,
      "fos_yielding": 1.5730689949478847,
      "deflection": 0.007709269792616653,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2489": {
      "node_id": "node_2489",
      "content": "MODIFICATION: Increase 0 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 241.00 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.58e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.99749435557385,
      "fos_buckling": 0.5218489470859405,
      "fos_yielding": 1.5728784533771962,
      "deflection": 0.007577866812203168,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.220)"
      },
      "parent_node_id": "node_2488",
      "improvement_over_parent": null
    },
    "node_2490": {
      "node_id": "node_2490",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 285.58 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.5794255235197,
      "fos_buckling": 1.4679131043443572,
      "fos_yielding": 2.011500050957169,
      "deflection": 0.004114383039927596,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2489",
      "improvement_over_parent": null
    },
    "node_2491": {
      "node_id": "node_2491",
      "content": "MODIFICATION: Increase 8 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.221458956961,
      "fos_buckling": 1.5229051328324226,
      "fos_yielding": 2.0124451246257204,
      "deflection": 0.0040407341250841035,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.332)"
      },
      "parent_node_id": "node_2490",
      "improvement_over_parent": null
    },
    "node_2492": {
      "node_id": "node_2492",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2491",
      "improvement_over_parent": null
    },
    "node_2493": {
      "node_id": "node_2493",
      "content": "INITIAL DESIGN (Trace 359)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2494": {
      "node_id": "node_2494",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n\nPerformance:\n  Mass: 181.75 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.46e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.7495139510949,
      "fos_buckling": 0.8314089387328006,
      "fos_yielding": 1.8116852557164331,
      "deflection": 0.007460197227520596,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003772)"
      },
      "parent_node_id": "node_2493",
      "improvement_over_parent": null
    },
    "node_2495": {
      "node_id": "node_2495",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 206.27 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.30e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.27117573139927,
      "fos_buckling": 0.8300067404082078,
      "fos_yielding": 1.5837918576814045,
      "deflection": 0.006304733412067246,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004051)"
      },
      "parent_node_id": "node_2494",
      "improvement_over_parent": null
    },
    "node_2496": {
      "node_id": "node_2496",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 226.77 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.17e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.77036892150844,
      "fos_buckling": 1.2165032173721329,
      "fos_yielding": 1.5942603402141498,
      "deflection": 0.005166977108734557,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003888)"
      },
      "parent_node_id": "node_2495",
      "improvement_over_parent": null
    },
    "node_2497": {
      "node_id": "node_2497",
      "content": "MODIFICATION: Increase 8 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 231.59 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.11e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.59234363317228,
      "fos_buckling": 1.214696604328898,
      "fos_yielding": 1.5838275753280826,
      "deflection": 0.005113664471563183,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.274)"
      },
      "parent_node_id": "node_2496",
      "improvement_over_parent": null
    },
    "node_2498": {
      "node_id": "node_2498",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0062)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 292.50 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.4965809104599,
      "fos_buckling": 1.474582133307937,
      "fos_yielding": 1.9982193335445089,
      "deflection": 0.004062136043456212,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.289)"
      },
      "parent_node_id": "node_2497",
      "improvement_over_parent": null
    },
    "node_2499": {
      "node_id": "node_2499",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2498",
      "improvement_over_parent": null
    },
    "node_2500": {
      "node_id": "node_2500",
      "content": "INITIAL DESIGN (Trace 360)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2501": {
      "node_id": "node_2501",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n\nPerformance:\n  Mass: 195.51 kg\n  Factor of Safety: 0.48\n  Max Deflection: 9.14e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.51298896111163,
      "fos_buckling": 0.48239196286771135,
      "fos_yielding": 1.4271546854408579,
      "deflection": 0.009137399358646799,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004501)"
      },
      "parent_node_id": "node_2500",
      "improvement_over_parent": null
    },
    "node_2502": {
      "node_id": "node_2502",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 235.91 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.9124112620388,
      "fos_buckling": 0.9296401239755359,
      "fos_yielding": 1.8123527972666327,
      "deflection": 0.0055166858473839,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005625)"
      },
      "parent_node_id": "node_2501",
      "improvement_over_parent": null
    },
    "node_2503": {
      "node_id": "node_2503",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.38 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.38329198742747,
      "fos_buckling": 1.0073506494357882,
      "fos_yielding": 1.999162497363891,
      "deflection": 0.005005810731365787,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.114)"
      },
      "parent_node_id": "node_2502",
      "improvement_over_parent": null
    },
    "node_2504": {
      "node_id": "node_2504",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.29582861904447,
      "fos_buckling": 1.5231495045202694,
      "fos_yielding": 2.0129545890030225,
      "deflection": 0.004039731270871267,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2503",
      "improvement_over_parent": null
    },
    "node_2505": {
      "node_id": "node_2505",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2504",
      "improvement_over_parent": null
    },
    "node_2506": {
      "node_id": "node_2506",
      "content": "INITIAL DESIGN (Trace 361)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 171.54 kg\n  Factor of Safety: 0.47\n  Max Deflection: 1.03e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.5400372825331,
      "fos_buckling": 0.46908910383439,
      "fos_yielding": 1.4504901801631807,
      "deflection": 0.010272809851950844,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2507": {
      "node_id": "node_2507",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 190.45 kg\n  Factor of Safety: 0.51\n  Max Deflection: 9.26e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.4459514934761,
      "fos_buckling": 0.5126131796029809,
      "fos_yielding": 1.6086460914895238,
      "deflection": 0.009263546234499357,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.119)"
      },
      "parent_node_id": "node_2506",
      "improvement_over_parent": null
    },
    "node_2508": {
      "node_id": "node_2508",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n\nPerformance:\n  Mass: 226.88 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.74e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.88338907213614,
      "fos_buckling": 0.9328734827219376,
      "fos_yielding": 1.9311063449857373,
      "deflection": 0.005735134885718492,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005123)"
      },
      "parent_node_id": "node_2507",
      "improvement_over_parent": null
    },
    "node_2509": {
      "node_id": "node_2509",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n\nPerformance:\n  Mass: 247.45 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.78e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.45021866812442,
      "fos_buckling": 1.3248134181732505,
      "fos_yielding": 1.7002843817714104,
      "deflection": 0.004775447829854289,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004040)"
      },
      "parent_node_id": "node_2508",
      "improvement_over_parent": null
    },
    "node_2510": {
      "node_id": "node_2510",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.18575420378727,
      "fos_buckling": 1.5227787314152224,
      "fos_yielding": 2.0124627498333116,
      "deflection": 0.00404120559291784,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.203)"
      },
      "parent_node_id": "node_2509",
      "improvement_over_parent": null
    },
    "node_2511": {
      "node_id": "node_2511",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2510",
      "improvement_over_parent": null
    },
    "node_2512": {
      "node_id": "node_2512",
      "content": "INITIAL DESIGN (Trace 362)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 142.62 kg\n  Factor of Safety: 0.59\n  Max Deflection: 9.32e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 142.62117671838922,
      "fos_buckling": 0.5870324195339879,
      "fos_yielding": 1.069342453702827,
      "deflection": 0.009316193968487983,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2513": {
      "node_id": "node_2513",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n\nPerformance:\n  Mass: 156.44 kg\n  Factor of Safety: 0.89\n  Max Deflection: 7.51e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 156.43720143866315,
      "fos_buckling": 0.8876857840510399,
      "fos_yielding": 1.076973466732909,
      "deflection": 0.007513866676703406,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002560)"
      },
      "parent_node_id": "node_2512",
      "improvement_over_parent": null
    },
    "node_2514": {
      "node_id": "node_2514",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n\nPerformance:\n  Mass: 195.42 kg\n  Factor of Safety: 1.08\n  Max Deflection: 6.03e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.4157964379645,
      "fos_buckling": 1.08194388713498,
      "fos_yielding": 1.344133178448657,
      "deflection": 0.006028800222363018,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.264)"
      },
      "parent_node_id": "node_2513",
      "improvement_over_parent": null
    },
    "node_2515": {
      "node_id": "node_2515",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n\nPerformance:\n  Mass: 248.29 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.76e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.28511388967917,
      "fos_buckling": 1.3285080875265178,
      "fos_yielding": 1.7057495635257176,
      "deflection": 0.004759650779678549,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.292)"
      },
      "parent_node_id": "node_2514",
      "improvement_over_parent": null
    },
    "node_2516": {
      "node_id": "node_2516",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.26814057531135,
      "fos_buckling": 1.523073643773357,
      "fos_yielding": 2.0127469786610246,
      "deflection": 0.004040114810412329,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.199)"
      },
      "parent_node_id": "node_2515",
      "improvement_over_parent": null
    },
    "node_2517": {
      "node_id": "node_2517",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2516",
      "improvement_over_parent": null
    },
    "node_2518": {
      "node_id": "node_2518",
      "content": "INITIAL DESIGN (Trace 363)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 180.32 kg\n  Factor of Safety: 0.75\n  Max Deflection: 7.13e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.32393430854484,
      "fos_buckling": 0.7478729213760833,
      "fos_yielding": 1.406143731951291,
      "deflection": 0.007128119745567099,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2519": {
      "node_id": "node_2519",
      "content": "MODIFICATION: Increase 4 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 181.63 kg\n  Factor of Safety: 0.75\n  Max Deflection: 7.13e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.62761305759312,
      "fos_buckling": 0.7478729213760833,
      "fos_yielding": 1.406143731951291,
      "deflection": 0.007128119745567099,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.381)"
      },
      "parent_node_id": "node_2518",
      "improvement_over_parent": null
    },
    "node_2520": {
      "node_id": "node_2520",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 203.81 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.36e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.80765517556097,
      "fos_buckling": 0.825691127598076,
      "fos_yielding": 1.5769309884772813,
      "deflection": 0.006361091644831171,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.131)"
      },
      "parent_node_id": "node_2519",
      "improvement_over_parent": null
    },
    "node_2521": {
      "node_id": "node_2521",
      "content": "MODIFICATION: Increase 5 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 204.73 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.34e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.7321369850377,
      "fos_buckling": 0.8255861165353376,
      "fos_yielding": 1.5739867940162835,
      "deflection": 0.006344588072690484,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.312)"
      },
      "parent_node_id": "node_2520",
      "improvement_over_parent": null
    },
    "node_2522": {
      "node_id": "node_2522",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 230.61 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.12e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.6110549582495,
      "fos_buckling": 1.2482567738417167,
      "fos_yielding": 1.5849483725029165,
      "deflection": 0.005119091860726202,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004146)"
      },
      "parent_node_id": "node_2521",
      "improvement_over_parent": null
    },
    "node_2523": {
      "node_id": "node_2523",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.42 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.41906065398285,
      "fos_buckling": 1.5237218289397259,
      "fos_yielding": 2.0137635263785074,
      "deflection": 0.0040380106652846285,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_2522",
      "improvement_over_parent": null
    },
    "node_2524": {
      "node_id": "node_2524",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2523",
      "improvement_over_parent": null
    },
    "node_2525": {
      "node_id": "node_2525",
      "content": "INITIAL DESIGN (Trace 364)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2526": {
      "node_id": "node_2526",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n\nPerformance:\n  Mass: 186.11 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.75e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.10994133564503,
      "fos_buckling": 0.46750445006181857,
      "fos_yielding": 1.0336932553050215,
      "deflection": 0.009748591395076295,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004320)"
      },
      "parent_node_id": "node_2525",
      "improvement_over_parent": null
    },
    "node_2527": {
      "node_id": "node_2527",
      "content": "MODIFICATION: Increase 6 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0072)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n\nPerformance:\n  Mass: 198.15 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.31e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.15433074391842,
      "fos_buckling": 0.4671169943486499,
      "fos_yielding": 1.0334269818200956,
      "deflection": 0.009309456144852787,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.357)"
      },
      "parent_node_id": "node_2526",
      "improvement_over_parent": null
    },
    "node_2528": {
      "node_id": "node_2528",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0072)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n\nPerformance:\n  Mass: 226.87 kg\n  Factor of Safety: 0.47\n  Max Deflection: 8.66e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.8743377629022,
      "fos_buckling": 0.46619568744580514,
      "fos_yielding": 1.0327926023619478,
      "deflection": 0.008655122124346278,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004639)"
      },
      "parent_node_id": "node_2527",
      "improvement_over_parent": null
    },
    "node_2529": {
      "node_id": "node_2529",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0072)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 265.78 kg\n  Factor of Safety: 1.15\n  Max Deflection: 4.50e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.7766011889114,
      "fos_buckling": 1.1520874809061854,
      "fos_yielding": 1.3329196666143357,
      "deflection": 0.0045016277175924475,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005399)"
      },
      "parent_node_id": "node_2528",
      "improvement_over_parent": null
    },
    "node_2530": {
      "node_id": "node_2530",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0084)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 304.23 kg\n  Factor of Safety: 1.30\n  Max Deflection: 3.94e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 304.22746963626946,
      "fos_buckling": 1.3011458845607209,
      "fos_yielding": 1.5308968637419347,
      "deflection": 0.003940034614475576,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.160)"
      },
      "parent_node_id": "node_2529",
      "improvement_over_parent": null
    },
    "node_2531": {
      "node_id": "node_2531",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2530",
      "improvement_over_parent": null
    },
    "node_2532": {
      "node_id": "node_2532",
      "content": "INITIAL DESIGN (Trace 365)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 223.67 kg\n  Factor of Safety: 0.72\n  Max Deflection: 7.87e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.66522639352732,
      "fos_buckling": 0.7166737411426748,
      "fos_yielding": 1.8337876742872683,
      "deflection": 0.007865762831273963,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2533": {
      "node_id": "node_2533",
      "content": "MODIFICATION: Increase 9 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 232.82 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.23e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.8174236394256,
      "fos_buckling": 0.8681826435473174,
      "fos_yielding": 1.8631167803599016,
      "deflection": 0.007231346638968766,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.364)"
      },
      "parent_node_id": "node_2532",
      "improvement_over_parent": null
    },
    "node_2534": {
      "node_id": "node_2534",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 258.75 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.51e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.7504903293689,
      "fos_buckling": 0.9488527018077849,
      "fos_yielding": 2.069077589889249,
      "deflection": 0.006512418599290093,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.121)"
      },
      "parent_node_id": "node_2533",
      "improvement_over_parent": null
    },
    "node_2535": {
      "node_id": "node_2535",
      "content": "MODIFICATION: Increase 4 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 259.78 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.51e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.7843887996883,
      "fos_buckling": 0.9524668008290907,
      "fos_yielding": 2.072560361575304,
      "deflection": 0.006512035689356213,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.211)"
      },
      "parent_node_id": "node_2534",
      "improvement_over_parent": null
    },
    "node_2536": {
      "node_id": "node_2536",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n\nPerformance:\n  Mass: 264.49 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.47e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.4867103002742,
      "fos_buckling": 1.4001852947331572,
      "fos_yielding": 1.8163972241217412,
      "deflection": 0.004472333976902907,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002953)"
      },
      "parent_node_id": "node_2535",
      "improvement_over_parent": null
    },
    "node_2537": {
      "node_id": "node_2537",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.37 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.36600765246794,
      "fos_buckling": 1.5234754063204232,
      "fos_yielding": 2.0134188461662745,
      "deflection": 0.0040388262300608095,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.120)"
      },
      "parent_node_id": "node_2536",
      "improvement_over_parent": null
    },
    "node_2538": {
      "node_id": "node_2538",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2537",
      "improvement_over_parent": null
    },
    "node_2539": {
      "node_id": "node_2539",
      "content": "INITIAL DESIGN (Trace 366)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2540": {
      "node_id": "node_2540",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 262.24 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.2439770070649,
      "fos_buckling": 1.0725888700714612,
      "fos_yielding": 2.2880718948682164,
      "deflection": 0.00485139429279112,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2539",
      "improvement_over_parent": null
    },
    "node_2541": {
      "node_id": "node_2541",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2225230561413,
      "fos_buckling": 1.5228696895163494,
      "fos_yielding": 2.012447164286147,
      "deflection": 0.004040726728707249,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2540",
      "improvement_over_parent": null
    },
    "node_2542": {
      "node_id": "node_2542",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2541",
      "improvement_over_parent": null
    },
    "node_2543": {
      "node_id": "node_2543",
      "content": "INITIAL DESIGN (Trace 367)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 235.56 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.45e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.55662597256773,
      "fos_buckling": 1.0087070894840886,
      "fos_yielding": 1.96819261795006,
      "deflection": 0.005449756585539521,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2544": {
      "node_id": "node_2544",
      "content": "MODIFICATION: Increase 9 thickness by 62%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 251.62 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.08e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.62169651603952,
      "fos_buckling": 1.0075959958267544,
      "fos_yielding": 2.020794840925339,
      "deflection": 0.005082881486345628,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.618)"
      },
      "parent_node_id": "node_2543",
      "improvement_over_parent": null
    },
    "node_2545": {
      "node_id": "node_2545",
      "content": "MODIFICATION: Increase 3 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 258.18 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.18031580662705,
      "fos_buckling": 1.0071430914074901,
      "fos_yielding": 1.998643279733739,
      "deflection": 0.005007427795211567,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.404)"
      },
      "parent_node_id": "node_2544",
      "improvement_over_parent": null
    },
    "node_2546": {
      "node_id": "node_2546",
      "content": "MODIFICATION: Increase 4 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.28 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.28012842724377,
      "fos_buckling": 1.0071430914074901,
      "fos_yielding": 1.998643279733739,
      "deflection": 0.005007427795211567,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.466)"
      },
      "parent_node_id": "node_2545",
      "improvement_over_parent": null
    },
    "node_2547": {
      "node_id": "node_2547",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.19266505886077,
      "fos_buckling": 1.5224459506354862,
      "fos_yielding": 2.0124278657306816,
      "deflection": 0.004041166621020216,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2546",
      "improvement_over_parent": null
    },
    "node_2548": {
      "node_id": "node_2548",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2547",
      "improvement_over_parent": null
    },
    "node_2549": {
      "node_id": "node_2549",
      "content": "INITIAL DESIGN (Trace 368)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 165.59 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.12e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.59404597131908,
      "fos_buckling": 0.3879747986852107,
      "fos_yielding": 0.9735279659857188,
      "deflection": 0.011182942286695634,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2550": {
      "node_id": "node_2550",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 196.89 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.24e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.88668952420602,
      "fos_buckling": 0.8884710114521153,
      "fos_yielding": 1.3957881191559403,
      "deflection": 0.006243115836803747,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004274)"
      },
      "parent_node_id": "node_2549",
      "improvement_over_parent": null
    },
    "node_2551": {
      "node_id": "node_2551",
      "content": "MODIFICATION: Increase 5 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 198.15 kg\n  Factor of Safety: 1.11\n  Max Deflection: 6.09e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.15010919923193,
      "fos_buckling": 1.1111698141277746,
      "fos_yielding": 1.3870660106980948,
      "deflection": 0.006089717248865533,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.560)"
      },
      "parent_node_id": "node_2550",
      "improvement_over_parent": null
    },
    "node_2552": {
      "node_id": "node_2552",
      "content": "MODIFICATION: Increase 1 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 205.86 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.73e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.85706289684913,
      "fos_buckling": 1.131932438296874,
      "fos_yielding": 1.4155593225039635,
      "deflection": 0.005726390373780189,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.484)"
      },
      "parent_node_id": "node_2551",
      "improvement_over_parent": null
    },
    "node_2553": {
      "node_id": "node_2553",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 264.08 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.48e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.07523645188303,
      "fos_buckling": 1.3981037094910145,
      "fos_yielding": 1.8135106346903302,
      "deflection": 0.004479075745305878,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.307)"
      },
      "parent_node_id": "node_2552",
      "improvement_over_parent": null
    },
    "node_2554": {
      "node_id": "node_2554",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.15 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1525795246191,
      "fos_buckling": 1.5222844734116814,
      "fos_yielding": 2.0118787955682045,
      "deflection": 0.0040416098955402165,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.121)"
      },
      "parent_node_id": "node_2553",
      "improvement_over_parent": null
    },
    "node_2555": {
      "node_id": "node_2555",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2554",
      "improvement_over_parent": null
    },
    "node_2556": {
      "node_id": "node_2556",
      "content": "INITIAL DESIGN (Trace 369)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 219.99 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.57e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.9887704053168,
      "fos_buckling": 0.9307802731205709,
      "fos_yielding": 2.0460432101326806,
      "deflection": 0.006571259482740129,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2557": {
      "node_id": "node_2557",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 247.69 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.57e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.68878262219894,
      "fos_buckling": 0.9436058631725459,
      "fos_yielding": 2.0532169376093896,
      "deflection": 0.0065698594146878005,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004621)"
      },
      "parent_node_id": "node_2556",
      "improvement_over_parent": null
    },
    "node_2558": {
      "node_id": "node_2558",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 277.08 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 277.07672782024036,
      "fos_buckling": 1.034398850138908,
      "fos_yielding": 2.294181013323575,
      "deflection": 0.0058807602177453205,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.130)"
      },
      "parent_node_id": "node_2557",
      "improvement_over_parent": null
    },
    "node_2559": {
      "node_id": "node_2559",
      "content": "MODIFICATION: Increase 7 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 287.94 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.94376797383444,
      "fos_buckling": 1.0364590827610642,
      "fos_yielding": 2.295423304532786,
      "deflection": 0.005880579425146022,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.541)"
      },
      "parent_node_id": "node_2558",
      "improvement_over_parent": null
    },
    "node_2560": {
      "node_id": "node_2560",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1575980076485,
      "fos_buckling": 1.522659784707376,
      "fos_yielding": 2.0120047638725693,
      "deflection": 0.0040415725409758,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2559",
      "improvement_over_parent": null
    },
    "node_2561": {
      "node_id": "node_2561",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2560",
      "improvement_over_parent": null
    },
    "node_2562": {
      "node_id": "node_2562",
      "content": "INITIAL DESIGN (Trace 370)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 140.07 kg\n  Factor of Safety: 0.67\n  Max Deflection: 2.03e+11 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 140.06935808850406,
      "fos_buckling": 0.6698173011433018,
      "fos_yielding": 1.0264287580395615,
      "deflection": 203151197638.3656,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2563": {
      "node_id": "node_2563",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 165.05 kg\n  Factor of Safety: 0.77\n  Max Deflection: 3.26e+11 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.05355423343713,
      "fos_buckling": 0.7739833724589724,
      "fos_yielding": 1.2117338629289196,
      "deflection": 325752651257.55927,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.190)"
      },
      "parent_node_id": "node_2562",
      "improvement_over_parent": null
    },
    "node_2564": {
      "node_id": "node_2564",
      "content": "MODIFICATION: Increase 4 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 166.97 kg\n  Factor of Safety: 0.77\n  Max Deflection: 3.26e+11 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.96893470638747,
      "fos_buckling": 0.7739833724589724,
      "fos_yielding": 1.6494334768694363,
      "deflection": 325752651257.559,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.385)"
      },
      "parent_node_id": "node_2563",
      "improvement_over_parent": null
    },
    "node_2565": {
      "node_id": "node_2565",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 193.89 kg\n  Factor of Safety: 0.88\n  Max Deflection: 4.11e+11 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.8933490445824,
      "fos_buckling": 0.8799661326281982,
      "fos_yielding": 1.9134557699695716,
      "deflection": 410761944273.2962,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.174)"
      },
      "parent_node_id": "node_2564",
      "improvement_over_parent": null
    },
    "node_2566": {
      "node_id": "node_2566",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 221.56 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.98e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.55886135436086,
      "fos_buckling": 0.8868286745445904,
      "fos_yielding": 1.9234515173807287,
      "deflection": 0.006977005051787166,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004455)"
      },
      "parent_node_id": "node_2565",
      "improvement_over_parent": null
    },
    "node_2567": {
      "node_id": "node_2567",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 263.52 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.87e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.52021751270263,
      "fos_buckling": 1.0255804089935212,
      "fos_yielding": 2.2867992576090224,
      "deflection": 0.005873240053859019,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.208)"
      },
      "parent_node_id": "node_2566",
      "improvement_over_parent": null
    },
    "node_2568": {
      "node_id": "node_2568",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 268.73 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.7340475465167,
      "fos_buckling": 1.071704903556655,
      "fos_yielding": 2.2867992576090224,
      "deflection": 0.004854946676555747,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2567",
      "improvement_over_parent": null
    },
    "node_2569": {
      "node_id": "node_2569",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.12 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.11551950734884,
      "fos_buckling": 1.5224583319488263,
      "fos_yielding": 2.0120960178621394,
      "deflection": 0.004042242052144468,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2568",
      "improvement_over_parent": null
    },
    "node_2570": {
      "node_id": "node_2570",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2569",
      "improvement_over_parent": null
    },
    "node_2571": {
      "node_id": "node_2571",
      "content": "INITIAL DESIGN (Trace 371)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0023)]\n\nPerformance:\n  Mass: 135.39 kg\n  Factor of Safety: 0.48\n  Max Deflection: 1.19e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 135.3929697323929,
      "fos_buckling": 0.4768061927060921,
      "fos_yielding": 1.3199999605644175,
      "deflection": 0.011896374061568635,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2572": {
      "node_id": "node_2572",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 150.82 kg\n  Factor of Safety: 0.53\n  Max Deflection: 1.07e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 150.81832095696723,
      "fos_buckling": 0.5279816812182158,
      "fos_yielding": 1.4687818223848692,
      "deflection": 0.010679538523646665,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.120)"
      },
      "parent_node_id": "node_2571",
      "improvement_over_parent": null
    },
    "node_2573": {
      "node_id": "node_2573",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 189.05 kg\n  Factor of Safety: 0.65\n  Max Deflection: 8.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.048161006206,
      "fos_buckling": 0.6519985449251796,
      "fos_yielding": 1.8360426204643483,
      "deflection": 0.00851933127228051,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.271)"
      },
      "parent_node_id": "node_2572",
      "improvement_over_parent": null
    },
    "node_2574": {
      "node_id": "node_2574",
      "content": "MODIFICATION: Increase 6 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 194.63 kg\n  Factor of Safety: 0.65\n  Max Deflection: 8.14e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.63126782266036,
      "fos_buckling": 0.6517450882205655,
      "fos_yielding": 1.8360426204643483,
      "deflection": 0.008142578767511264,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.205)"
      },
      "parent_node_id": "node_2573",
      "improvement_over_parent": null
    },
    "node_2575": {
      "node_id": "node_2575",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 221.19 kg\n  Factor of Safety: 0.67\n  Max Deflection: 8.13e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.1947724874807,
      "fos_buckling": 0.665936005904873,
      "fos_yielding": 1.8173750307732761,
      "deflection": 0.008126356393996054,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004264)"
      },
      "parent_node_id": "node_2574",
      "improvement_over_parent": null
    },
    "node_2576": {
      "node_id": "node_2576",
      "content": "MODIFICATION: Increase 9 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0064)]\n\nPerformance:\n  Mass: 232.91 kg\n  Factor of Safety: 0.67\n  Max Deflection: 8.13e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.90863652951208,
      "fos_buckling": 0.6665155538461951,
      "fos_yielding": 1.8160462968012105,
      "deflection": 0.0081257085644348,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.493)"
      },
      "parent_node_id": "node_2575",
      "improvement_over_parent": null
    },
    "node_2577": {
      "node_id": "node_2577",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0080)]\n\nPerformance:\n  Mass: 288.40 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.55e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.40285973068256,
      "fos_buckling": 0.8102969932790176,
      "fos_yielding": 2.2483679027297567,
      "deflection": 0.006552857136814551,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.263)"
      },
      "parent_node_id": "node_2576",
      "improvement_over_parent": null
    },
    "node_2578": {
      "node_id": "node_2578",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0080)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.62 kg\n  Factor of Safety: 1.21\n  Max Deflection: 4.24e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.61668976449664,
      "fos_buckling": 1.2086546044024198,
      "fos_yielding": 1.968923263949226,
      "deflection": 0.004243387725859032,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2577",
      "improvement_over_parent": null
    },
    "node_2579": {
      "node_id": "node_2579",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2578",
      "improvement_over_parent": null
    },
    "node_2580": {
      "node_id": "node_2580",
      "content": "INITIAL DESIGN (Trace 372)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0020)]\n\nPerformance:\n  Mass: 125.66 kg\n  Factor of Safety: 0.35\n  Max Deflection: 1.40e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 125.65656589769515,
      "fos_buckling": 0.3463395137073596,
      "fos_yielding": 1.0311480538888125,
      "deflection": 0.01403395071892323,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2581": {
      "node_id": "node_2581",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0023)]\n\nPerformance:\n  Mass: 143.22 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.23e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 143.2208142047191,
      "fos_buckling": 0.3892399461757821,
      "fos_yielding": 1.1737640927319675,
      "deflection": 0.012324897525807545,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.147)"
      },
      "parent_node_id": "node_2580",
      "improvement_over_parent": null
    },
    "node_2582": {
      "node_id": "node_2582",
      "content": "MODIFICATION: Increase 9 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 153.56 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.16e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.55831354784732,
      "fos_buckling": 0.38896223560594984,
      "fos_yielding": 1.17331887109538,
      "deflection": 0.011648589233951715,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.639)"
      },
      "parent_node_id": "node_2581",
      "improvement_over_parent": null
    },
    "node_2583": {
      "node_id": "node_2583",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 195.81 kg\n  Factor of Safety: 0.48\n  Max Deflection: 9.16e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.81266698002403,
      "fos_buckling": 0.48052550540481326,
      "fos_yielding": 1.4927551120508038,
      "deflection": 0.009157327612502859,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.295)"
      },
      "parent_node_id": "node_2582",
      "improvement_over_parent": null
    },
    "node_2584": {
      "node_id": "node_2584",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n\nPerformance:\n  Mass: 223.59 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.32e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.5855507942553,
      "fos_buckling": 1.0969364349259985,
      "fos_yielding": 1.5793688337942438,
      "deflection": 0.0053159346688234,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003833)"
      },
      "parent_node_id": "node_2583",
      "improvement_over_parent": null
    },
    "node_2585": {
      "node_id": "node_2585",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 285.65 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.17e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.6546244119208,
      "fos_buckling": 1.356971019091018,
      "fos_yielding": 2.013868994781657,
      "deflection": 0.004174894375805083,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_2584",
      "improvement_over_parent": null
    },
    "node_2586": {
      "node_id": "node_2586",
      "content": "MODIFICATION: Increase 7 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0066)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 292.46 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.46320129113207,
      "fos_buckling": 1.3953517105482123,
      "fos_yielding": 2.014457740536069,
      "deflection": 0.004120153734617479,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.233)"
      },
      "parent_node_id": "node_2585",
      "improvement_over_parent": null
    },
    "node_2587": {
      "node_id": "node_2587",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2586",
      "improvement_over_parent": null
    },
    "node_2588": {
      "node_id": "node_2588",
      "content": "INITIAL DESIGN (Trace 373)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n\nPerformance:\n  Mass: 172.28 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.04e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.28134254868408,
      "fos_buckling": 0.3963741827506843,
      "fos_yielding": 1.1345926703892488,
      "deflection": 0.010403556915911829,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2589": {
      "node_id": "node_2589",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 199.83 kg\n  Factor of Safety: 0.45\n  Max Deflection: 8.99e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.82721556385576,
      "fos_buckling": 0.4497265066099914,
      "fos_yielding": 1.3144001202844184,
      "deflection": 0.008986474966765355,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.172)"
      },
      "parent_node_id": "node_2588",
      "improvement_over_parent": null
    },
    "node_2590": {
      "node_id": "node_2590",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 239.61 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.61447809489636,
      "fos_buckling": 0.5220005276470076,
      "fos_yielding": 1.5732988341623995,
      "deflection": 0.007515033010885106,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.218)"
      },
      "parent_node_id": "node_2589",
      "improvement_over_parent": null
    },
    "node_2591": {
      "node_id": "node_2591",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 284.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.24e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 284.1964092628422,
      "fos_buckling": 1.521993937941881,
      "fos_yielding": 1.9810664017760633,
      "deflection": 0.004239555133205148,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2590",
      "improvement_over_parent": null
    },
    "node_2592": {
      "node_id": "node_2592",
      "content": "MODIFICATION: Increase 1 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.26714655310076,
      "fos_buckling": 1.5231176303394993,
      "fos_yielding": 2.01284178842071,
      "deflection": 0.0040402260344766785,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.383)"
      },
      "parent_node_id": "node_2591",
      "improvement_over_parent": null
    },
    "node_2593": {
      "node_id": "node_2593",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2592",
      "improvement_over_parent": null
    },
    "node_2594": {
      "node_id": "node_2594",
      "content": "INITIAL DESIGN (Trace 374)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 166.39 kg\n  Factor of Safety: 0.66\n  Max Deflection: 8.96e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.3941924712746,
      "fos_buckling": 0.6606399374326197,
      "fos_yielding": 1.7588208743940306,
      "deflection": 0.008959425309851849,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2595": {
      "node_id": "node_2595",
      "content": "MODIFICATION: Increase 8 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 175.31 kg\n  Factor of Safety: 0.81\n  Max Deflection: 8.25e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.31076942677058,
      "fos_buckling": 0.8106978928527221,
      "fos_yielding": 1.7588208743940306,
      "deflection": 0.008250464130324257,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.377)"
      },
      "parent_node_id": "node_2594",
      "improvement_over_parent": null
    },
    "node_2596": {
      "node_id": "node_2596",
      "content": "MODIFICATION: Increase 0 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 181.56 kg\n  Factor of Safety: 0.81\n  Max Deflection: 7.69e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.5625982926331,
      "fos_buckling": 0.8103487191911374,
      "fos_yielding": 1.7588208743940306,
      "deflection": 0.007686748217776154,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.337)"
      },
      "parent_node_id": "node_2595",
      "improvement_over_parent": null
    },
    "node_2597": {
      "node_id": "node_2597",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n\nPerformance:\n  Mass: 201.46 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.29e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.46161472338164,
      "fos_buckling": 0.8614024013069075,
      "fos_yielding": 1.7588208743940306,
      "deflection": 0.006291628407831036,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003766)"
      },
      "parent_node_id": "node_2596",
      "improvement_over_parent": null
    },
    "node_2598": {
      "node_id": "node_2598",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 262.40 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.3970588230279,
      "fos_buckling": 1.0725735013703719,
      "fos_yielding": 2.289662383587707,
      "deflection": 0.004849154728350762,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_2597",
      "improvement_over_parent": null
    },
    "node_2599": {
      "node_id": "node_2599",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.38 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3756048721043,
      "fos_buckling": 1.5229406406445296,
      "fos_yielding": 2.0138096169128987,
      "deflection": 0.004038601101215752,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2598",
      "improvement_over_parent": null
    },
    "node_2600": {
      "node_id": "node_2600",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2599",
      "improvement_over_parent": null
    },
    "node_2601": {
      "node_id": "node_2601",
      "content": "INITIAL DESIGN (Trace 375)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 146.24 kg\n  Factor of Safety: 0.67\n  Max Deflection: 8.55e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.23840749940655,
      "fos_buckling": 0.6692956542701353,
      "fos_yielding": 1.3172745425717831,
      "deflection": 0.008550703879773053,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2602": {
      "node_id": "node_2602",
      "content": "MODIFICATION: Increase 2 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 150.83 kg\n  Factor of Safety: 0.67\n  Max Deflection: 8.38e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 150.82712927907272,
      "fos_buckling": 0.6690836535514493,
      "fos_yielding": 1.3172745425717831,
      "deflection": 0.008375585711881996,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.468)"
      },
      "parent_node_id": "node_2601",
      "improvement_over_parent": null
    },
    "node_2603": {
      "node_id": "node_2603",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 176.85 kg\n  Factor of Safety: 0.77\n  Max Deflection: 7.15e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.8520745208929,
      "fos_buckling": 0.7701689908164554,
      "fos_yielding": 1.5442390057018753,
      "deflection": 0.007154863960385982,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.183)"
      },
      "parent_node_id": "node_2602",
      "improvement_over_parent": null
    },
    "node_2604": {
      "node_id": "node_2604",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 207.50 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.11e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.49852540823676,
      "fos_buckling": 0.8838587625428656,
      "fos_yielding": 1.811383821940385,
      "deflection": 0.006109971875846392,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.186)"
      },
      "parent_node_id": "node_2603",
      "improvement_over_parent": null
    },
    "node_2605": {
      "node_id": "node_2605",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 230.47 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.51e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.4718259952538,
      "fos_buckling": 0.9653112130079408,
      "fos_yielding": 2.0115539722871065,
      "deflection": 0.005508927004716286,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.120)"
      },
      "parent_node_id": "node_2604",
      "improvement_over_parent": null
    },
    "node_2606": {
      "node_id": "node_2606",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n\nPerformance:\n  Mass: 257.70 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.59e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.70213073474497,
      "fos_buckling": 1.3704876250130398,
      "fos_yielding": 1.7701869731950837,
      "deflection": 0.004588120368013935,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004536)"
      },
      "parent_node_id": "node_2605",
      "improvement_over_parent": null
    },
    "node_2607": {
      "node_id": "node_2607",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.12 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.12078514294706,
      "fos_buckling": 1.5225594410206804,
      "fos_yielding": 2.0118734442431374,
      "deflection": 0.0040420164144526595,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.151)"
      },
      "parent_node_id": "node_2606",
      "improvement_over_parent": null
    },
    "node_2608": {
      "node_id": "node_2608",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2607",
      "improvement_over_parent": null
    },
    "node_2609": {
      "node_id": "node_2609",
      "content": "INITIAL DESIGN (Trace 376)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 223.81 kg\n  Factor of Safety: 0.94\n  Max Deflection: 5.49e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.81283503177832,
      "fos_buckling": 0.9412449497650721,
      "fos_yielding": 1.5117321949949136,
      "deflection": 0.005487582950450416,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2610": {
      "node_id": "node_2610",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.95 kg\n  Factor of Safety: 1.11\n  Max Deflection: 4.57e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.9545171826915,
      "fos_buckling": 1.11379139894007,
      "fos_yielding": 1.8233036487019196,
      "deflection": 0.00457477888128844,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.220)"
      },
      "parent_node_id": "node_2609",
      "improvement_over_parent": null
    },
    "node_2611": {
      "node_id": "node_2611",
      "content": "MODIFICATION: Increase 0 thickness by 62%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 281.21 kg\n  Factor of Safety: 1.16\n  Max Deflection: 4.30e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.21326912408625,
      "fos_buckling": 1.1637720353987573,
      "fos_yielding": 1.905123167964047,
      "deflection": 0.0043005474597484,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.618)"
      },
      "parent_node_id": "node_2610",
      "improvement_over_parent": null
    },
    "node_2612": {
      "node_id": "node_2612",
      "content": "MODIFICATION: Increase 7 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 290.99 kg\n  Factor of Safety: 1.20\n  Max Deflection: 4.11e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.9900424269455,
      "fos_buckling": 1.2015152102741804,
      "fos_yielding": 1.9669096645463,
      "deflection": 0.0041093885815784775,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.321)"
      },
      "parent_node_id": "node_2611",
      "improvement_over_parent": null
    },
    "node_2613": {
      "node_id": "node_2613",
      "content": "MODIFICATION: Increase 4 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.40 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.40358676971437,
      "fos_buckling": 1.523636752348673,
      "fos_yielding": 2.013681928442895,
      "deflection": 0.004038263558097106,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.570)"
      },
      "parent_node_id": "node_2612",
      "improvement_over_parent": null
    },
    "node_2614": {
      "node_id": "node_2614",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2613",
      "improvement_over_parent": null
    },
    "node_2615": {
      "node_id": "node_2615",
      "content": "INITIAL DESIGN (Trace 377)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 144.80 kg\n  Factor of Safety: 0.65\n  Max Deflection: 8.72e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 144.80262807000585,
      "fos_buckling": 0.6450325359523738,
      "fos_yielding": 1.264604224099578,
      "deflection": 0.008721091256756918,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2616": {
      "node_id": "node_2616",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 167.55 kg\n  Factor of Safety: 0.73\n  Max Deflection: 7.55e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 167.54601995688392,
      "fos_buckling": 0.7344428735134197,
      "fos_yielding": 1.4629579076113448,
      "deflection": 0.007548137390128897,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.166)"
      },
      "parent_node_id": "node_2615",
      "improvement_over_parent": null
    },
    "node_2617": {
      "node_id": "node_2617",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 187.33 kg\n  Factor of Safety: 1.04\n  Max Deflection: 6.29e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.331176816288,
      "fos_buckling": 1.0425072537256699,
      "fos_yielding": 1.2888240729206222,
      "deflection": 0.006285920354256486,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003223)"
      },
      "parent_node_id": "node_2616",
      "improvement_over_parent": null
    },
    "node_2618": {
      "node_id": "node_2618",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 239.40 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.93e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.3967467044323,
      "fos_buckling": 1.2883874420214907,
      "fos_yielding": 1.6450957383282319,
      "deflection": 0.004933741747427126,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_2617",
      "improvement_over_parent": null
    },
    "node_2619": {
      "node_id": "node_2619",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.46 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.46060465970726,
      "fos_buckling": 1.523846120531302,
      "fos_yielding": 2.014155939064961,
      "deflection": 0.004037447385066191,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.248)"
      },
      "parent_node_id": "node_2618",
      "improvement_over_parent": null
    },
    "node_2620": {
      "node_id": "node_2620",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2619",
      "improvement_over_parent": null
    },
    "node_2621": {
      "node_id": "node_2621",
      "content": "INITIAL DESIGN (Trace 378)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 247.28 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.78e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.28048175676707,
      "fos_buckling": 1.32199496547845,
      "fos_yielding": 1.7842225594614514,
      "deflection": 0.004778229885739164,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2622": {
      "node_id": "node_2622",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.29 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.19e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.286874044031,
      "fos_buckling": 1.4732377375631605,
      "fos_yielding": 2.034157452660698,
      "deflection": 0.004193975288391346,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.155)"
      },
      "parent_node_id": "node_2621",
      "improvement_over_parent": null
    },
    "node_2623": {
      "node_id": "node_2623",
      "content": "MODIFICATION: Increase 0 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 287.14 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.1397061968735,
      "fos_buckling": 1.4747891980738879,
      "fos_yielding": 2.0332573030778223,
      "deflection": 0.004102202574132139,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.183)"
      },
      "parent_node_id": "node_2622",
      "improvement_over_parent": null
    },
    "node_2624": {
      "node_id": "node_2624",
      "content": "MODIFICATION: Increase 3 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.37 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3698345085963,
      "fos_buckling": 1.5235935131953353,
      "fos_yielding": 2.013321031445232,
      "deflection": 0.0040389078809947325,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.376)"
      },
      "parent_node_id": "node_2623",
      "improvement_over_parent": null
    },
    "node_2625": {
      "node_id": "node_2625",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2624",
      "improvement_over_parent": null
    },
    "node_2626": {
      "node_id": "node_2626",
      "content": "INITIAL DESIGN (Trace 379)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 210.11 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.71e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.10572811557233,
      "fos_buckling": 1.1838296053032893,
      "fos_yielding": 1.4674275256530427,
      "deflection": 0.005713014732734202,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2627": {
      "node_id": "node_2627",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 253.20 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.75e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.19816076967447,
      "fos_buckling": 1.38540032301495,
      "fos_yielding": 1.766368942569574,
      "deflection": 0.00475097744348797,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.222)"
      },
      "parent_node_id": "node_2626",
      "improvement_over_parent": null
    },
    "node_2628": {
      "node_id": "node_2628",
      "content": "MODIFICATION: Increase 1 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 261.36 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 261.35910374154065,
      "fos_buckling": 1.3864188571003293,
      "fos_yielding": 1.795006848050218,
      "deflection": 0.004524975350693256,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.383)"
      },
      "parent_node_id": "node_2627",
      "improvement_over_parent": null
    },
    "node_2629": {
      "node_id": "node_2629",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.23115534814,
      "fos_buckling": 1.522838555588608,
      "fos_yielding": 2.0124577899872653,
      "deflection": 0.004040602216545454,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.134)"
      },
      "parent_node_id": "node_2628",
      "improvement_over_parent": null
    },
    "node_2630": {
      "node_id": "node_2630",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2629",
      "improvement_over_parent": null
    },
    "node_2631": {
      "node_id": "node_2631",
      "content": "INITIAL DESIGN (Trace 380)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 234.62 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.70e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.61840936270505,
      "fos_buckling": 0.9277599803571643,
      "fos_yielding": 1.7848030395956218,
      "deflection": 0.005702699292480728,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2632": {
      "node_id": "node_2632",
      "content": "MODIFICATION: Increase 1 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 241.68 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.53e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.6808681710433,
      "fos_buckling": 0.9273103872907037,
      "fos_yielding": 1.8076185563644633,
      "deflection": 0.005531496307082915,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.311)"
      },
      "parent_node_id": "node_2631",
      "improvement_over_parent": null
    },
    "node_2633": {
      "node_id": "node_2633",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n\nPerformance:\n  Mass: 265.09 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.46e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.0911514037976,
      "fos_buckling": 1.4025437567407797,
      "fos_yielding": 1.820422522094382,
      "deflection": 0.00446214889014854,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004488)"
      },
      "parent_node_id": "node_2632",
      "improvement_over_parent": null
    },
    "node_2634": {
      "node_id": "node_2634",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.31 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.31280968470134,
      "fos_buckling": 1.522954982093099,
      "fos_yielding": 2.012945907141667,
      "deflection": 0.004039417438038542,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.117)"
      },
      "parent_node_id": "node_2633",
      "improvement_over_parent": null
    },
    "node_2635": {
      "node_id": "node_2635",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2634",
      "improvement_over_parent": null
    },
    "node_2636": {
      "node_id": "node_2636",
      "content": "INITIAL DESIGN (Trace 381)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 144.30 kg\n  Factor of Safety: 0.81\n  Max Deflection: 2.19e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 144.3026451783418,
      "fos_buckling": 0.812445316272223,
      "fos_yielding": 0.9467875272427922,
      "deflection": 21936195844719.316,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2637": {
      "node_id": "node_2637",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 160.80 kg\n  Factor of Safety: 0.03\n  Max Deflection: 2.09e+14 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.80132460128246,
      "fos_buckling": 0.0311423004433461,
      "fos_yielding": 0.07033171070477347,
      "deflection": 209333742676598.88,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.122)"
      },
      "parent_node_id": "node_2636",
      "improvement_over_parent": null
    },
    "node_2638": {
      "node_id": "node_2638",
      "content": "MODIFICATION: Increase 2 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 166.11 kg\n  Factor of Safety: 0.50\n  Max Deflection: 1.12e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.10655884290867,
      "fos_buckling": 0.4982768070935376,
      "fos_yielding": 1.1253073712763755,
      "deflection": 11159446068031.984,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.383)"
      },
      "parent_node_id": "node_2637",
      "improvement_over_parent": null
    },
    "node_2639": {
      "node_id": "node_2639",
      "content": "MODIFICATION: Increase 1 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 174.49 kg\n  Factor of Safety: 1.00\n  Max Deflection: 5.63e+12 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.48932938021431,
      "fos_buckling": 0.9965536141870752,
      "fos_yielding": 1.5564679033758362,
      "deflection": 5632855745588.897,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.475)"
      },
      "parent_node_id": "node_2638",
      "improvement_over_parent": null
    },
    "node_2640": {
      "node_id": "node_2640",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 224.09 kg\n  Factor of Safety: 0.76\n  Max Deflection: 2.11e+13 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.08995802231902,
      "fos_buckling": 0.7594780565879461,
      "fos_yielding": 0.5626536856381877,
      "deflection": 21092318900416.23,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.312)"
      },
      "parent_node_id": "node_2639",
      "improvement_over_parent": null
    },
    "node_2641": {
      "node_id": "node_2641",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.67 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.6718891902649,
      "fos_buckling": 1.0721375237899418,
      "fos_yielding": 2.2855170315127338,
      "deflection": 0.004855303137893052,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2640",
      "improvement_over_parent": null
    },
    "node_2642": {
      "node_id": "node_2642",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.05 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.05336115109696,
      "fos_buckling": 1.5228392051765152,
      "fos_yielding": 2.011055248521008,
      "deflection": 0.004043016351283135,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2641",
      "improvement_over_parent": null
    },
    "node_2643": {
      "node_id": "node_2643",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2642",
      "improvement_over_parent": null
    },
    "node_2644": {
      "node_id": "node_2644",
      "content": "INITIAL DESIGN (Trace 382)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 185.59 kg\n  Factor of Safety: 0.76\n  Max Deflection: 6.99e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.59266366639133,
      "fos_buckling": 0.7589225446167163,
      "fos_yielding": 1.4275239072054098,
      "deflection": 0.006990494377010155,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2645": {
      "node_id": "node_2645",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 215.05 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.04e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.0490792775083,
      "fos_buckling": 0.8606476080884569,
      "fos_yielding": 1.6529147597108937,
      "deflection": 0.00604402379209209,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_2644",
      "improvement_over_parent": null
    },
    "node_2646": {
      "node_id": "node_2646",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 242.23 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.2250997462077,
      "fos_buckling": 1.301276614273517,
      "fos_yielding": 1.6644076982147913,
      "deflection": 0.00487693285618889,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004370)"
      },
      "parent_node_id": "node_2645",
      "improvement_over_parent": null
    },
    "node_2647": {
      "node_id": "node_2647",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.40 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3951430619222,
      "fos_buckling": 1.5236546075524415,
      "fos_yielding": 2.0136882679308292,
      "deflection": 0.004038331966198268,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.232)"
      },
      "parent_node_id": "node_2646",
      "improvement_over_parent": null
    },
    "node_2648": {
      "node_id": "node_2648",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2647",
      "improvement_over_parent": null
    },
    "node_2649": {
      "node_id": "node_2649",
      "content": "INITIAL DESIGN (Trace 383)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 186.50 kg\n  Factor of Safety: 0.43\n  Max Deflection: 9.44e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.496244227649,
      "fos_buckling": 0.4311513619710506,
      "fos_yielding": 1.2505403993563011,
      "deflection": 0.009442023919728256,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2650": {
      "node_id": "node_2650",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 208.74 kg\n  Factor of Safety: 0.47\n  Max Deflection: 8.45e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.74367329675204,
      "fos_buckling": 0.47381117507576587,
      "fos_yielding": 1.398231853075624,
      "deflection": 0.008449295110115194,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.129)"
      },
      "parent_node_id": "node_2649",
      "improvement_over_parent": null
    },
    "node_2651": {
      "node_id": "node_2651",
      "content": "MODIFICATION: Increase 1 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 214.32 kg\n  Factor of Safety: 0.47\n  Max Deflection: 8.45e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.32054431606113,
      "fos_buckling": 0.47362952547654913,
      "fos_yielding": 1.398065153667747,
      "deflection": 0.008451812974671884,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.311)"
      },
      "parent_node_id": "node_2650",
      "improvement_over_parent": null
    },
    "node_2652": {
      "node_id": "node_2652",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 247.95 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.84e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.95416498334856,
      "fos_buckling": 1.301582225388345,
      "fos_yielding": 1.7515776568009769,
      "deflection": 0.0048360006318851805,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004616)"
      },
      "parent_node_id": "node_2651",
      "improvement_over_parent": null
    },
    "node_2653": {
      "node_id": "node_2653",
      "content": "MODIFICATION: Increase 10 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 253.91 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.71e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.90825190859363,
      "fos_buckling": 1.382267192434174,
      "fos_yielding": 1.7668528704554554,
      "deflection": 0.004713112235148257,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.192)"
      },
      "parent_node_id": "node_2652",
      "improvement_over_parent": null
    },
    "node_2654": {
      "node_id": "node_2654",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 286.10 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.19e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 286.09928736913486,
      "fos_buckling": 1.5233232314137224,
      "fos_yielding": 1.9891586469003057,
      "deflection": 0.004189848456363415,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.139)"
      },
      "parent_node_id": "node_2653",
      "improvement_over_parent": null
    },
    "node_2655": {
      "node_id": "node_2655",
      "content": "MODIFICATION: Increase 1 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.37 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.37474315329666,
      "fos_buckling": 1.523120668944279,
      "fos_yielding": 2.013378562365361,
      "deflection": 0.00403859728664396,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.287)"
      },
      "parent_node_id": "node_2654",
      "improvement_over_parent": null
    },
    "node_2656": {
      "node_id": "node_2656",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2655",
      "improvement_over_parent": null
    },
    "node_2657": {
      "node_id": "node_2657",
      "content": "INITIAL DESIGN (Trace 384)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 219.16 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.91e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.1636571845625,
      "fos_buckling": 0.8966368365152843,
      "fos_yielding": 1.716147967803191,
      "deflection": 0.005910506405787298,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2658": {
      "node_id": "node_2658",
      "content": "MODIFICATION: Increase 9 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 225.72 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.76e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.72107209910902,
      "fos_buckling": 0.8962329678564739,
      "fos_yielding": 1.7344599911791252,
      "deflection": 0.005762117681851555,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.221)"
      },
      "parent_node_id": "node_2657",
      "improvement_over_parent": null
    },
    "node_2659": {
      "node_id": "node_2659",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n\nPerformance:\n  Mass: 254.26 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.65e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.25819101033278,
      "fos_buckling": 1.3552485378961865,
      "fos_yielding": 1.7464995921342503,
      "deflection": 0.0046494528569030955,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004607)"
      },
      "parent_node_id": "node_2658",
      "improvement_over_parent": null
    },
    "node_2660": {
      "node_id": "node_2660",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1417769896269,
      "fos_buckling": 1.5226539908626382,
      "fos_yielding": 2.0118280882101804,
      "deflection": 0.004041830917575825,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.168)"
      },
      "parent_node_id": "node_2659",
      "improvement_over_parent": null
    },
    "node_2661": {
      "node_id": "node_2661",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2660",
      "improvement_over_parent": null
    },
    "node_2662": {
      "node_id": "node_2662",
      "content": "INITIAL DESIGN (Trace 385)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 199.22 kg\n  Factor of Safety: 0.92\n  Max Deflection: 6.01e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.21500047810147,
      "fos_buckling": 0.9238337737232534,
      "fos_yielding": 1.4298769376188727,
      "deflection": 0.006006878351554291,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2663": {
      "node_id": "node_2663",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 252.06 kg\n  Factor of Safety: 1.14\n  Max Deflection: 4.76e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.05872979882815,
      "fos_buckling": 1.1422006188416305,
      "fos_yielding": 1.8058539973406094,
      "deflection": 0.004760227314196219,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.287)"
      },
      "parent_node_id": "node_2662",
      "improvement_over_parent": null
    },
    "node_2664": {
      "node_id": "node_2664",
      "content": "MODIFICATION: Increase 7 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 262.63 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.50e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.63243093553297,
      "fos_buckling": 1.3921119726442706,
      "fos_yielding": 1.8037933877543944,
      "deflection": 0.004503416272054311,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.408)"
      },
      "parent_node_id": "node_2663",
      "improvement_over_parent": null
    },
    "node_2665": {
      "node_id": "node_2665",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 292.99 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.98816715021076,
      "fos_buckling": 1.521940598259025,
      "fos_yielding": 2.0109036620191953,
      "deflection": 0.004043937862867491,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.127)"
      },
      "parent_node_id": "node_2664",
      "improvement_over_parent": null
    },
    "node_2666": {
      "node_id": "node_2666",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2665",
      "improvement_over_parent": null
    },
    "node_2667": {
      "node_id": "node_2667",
      "content": "INITIAL DESIGN (Trace 386)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 192.70 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.87e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 192.69578751186586,
      "fos_buckling": 0.8927350340688667,
      "fos_yielding": 1.9701625749018912,
      "deflection": 0.006872557979392376,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2668": {
      "node_id": "node_2668",
      "content": "MODIFICATION: Increase 7 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 200.30 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.88e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.29862727406137,
      "fos_buckling": 0.8922679615014174,
      "fos_yielding": 1.9692317851146202,
      "deflection": 0.006877555459712772,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.431)"
      },
      "parent_node_id": "node_2667",
      "improvement_over_parent": null
    },
    "node_2669": {
      "node_id": "node_2669",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n\nPerformance:\n  Mass: 222.59 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.76e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.591290350795,
      "fos_buckling": 0.9489207833330378,
      "fos_yielding": 1.9692317851146202,
      "deflection": 0.005755203936090906,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004256)"
      },
      "parent_node_id": "node_2668",
      "improvement_over_parent": null
    },
    "node_2670": {
      "node_id": "node_2670",
      "content": "MODIFICATION: Increase 7 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n\nPerformance:\n  Mass: 231.91 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.76e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.91190900313316,
      "fos_buckling": 0.9483134643315133,
      "fos_yielding": 1.9680918928173745,
      "deflection": 0.005758519975726023,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.391)"
      },
      "parent_node_id": "node_2669",
      "improvement_over_parent": null
    },
    "node_2671": {
      "node_id": "node_2671",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0073)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 269.36 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.97e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 269.3550945512721,
      "fos_buckling": 1.072316659490976,
      "fos_yielding": 2.286000749816077,
      "deflection": 0.004965455814331963,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.178)"
      },
      "parent_node_id": "node_2670",
      "improvement_over_parent": null
    },
    "node_2672": {
      "node_id": "node_2672",
      "content": "MODIFICATION: Increase 4 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0065)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0073)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 273.09 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.97e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 273.09268895466016,
      "fos_buckling": 1.072316659490976,
      "fos_yielding": 2.9814913873382562,
      "deflection": 0.004965455814331963,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.431)"
      },
      "parent_node_id": "node_2671",
      "improvement_over_parent": null
    },
    "node_2673": {
      "node_id": "node_2673",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0065)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0073)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 297.47 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.07e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 297.47416091549223,
      "fos_buckling": 1.3895229864588907,
      "fos_yielding": 2.728896780774729,
      "deflection": 0.0040748484648435645,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2672",
      "improvement_over_parent": null
    },
    "node_2674": {
      "node_id": "node_2674",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2673",
      "improvement_over_parent": null
    },
    "node_2675": {
      "node_id": "node_2675",
      "content": "INITIAL DESIGN (Trace 387)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 167.43 kg\n  Factor of Safety: 0.47\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 167.42809596400613,
      "fos_buckling": 0.47143438994099635,
      "fos_yielding": 1.45855766106882,
      "deflection": 0.010216252177946968,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2676": {
      "node_id": "node_2676",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 191.11 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.38e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 191.10786300471014,
      "fos_buckling": 0.47066581337774277,
      "fos_yielding": 1.4572929348820045,
      "deflection": 0.009380135424855324,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003902)"
      },
      "parent_node_id": "node_2675",
      "improvement_over_parent": null
    },
    "node_2677": {
      "node_id": "node_2677",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n\nPerformance:\n  Mass: 216.54 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.29e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.53703062043905,
      "fos_buckling": 0.5230389826414149,
      "fos_yielding": 1.6489311956766417,
      "deflection": 0.008290755489269835,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_2676",
      "improvement_over_parent": null
    },
    "node_2678": {
      "node_id": "node_2678",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 250.05 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.19e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.04523611323526,
      "fos_buckling": 0.5884337624771012,
      "fos_yielding": 1.900650563321249,
      "deflection": 0.007193624795775197,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.170)"
      },
      "parent_node_id": "node_2677",
      "improvement_over_parent": null
    },
    "node_2679": {
      "node_id": "node_2679",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n\nPerformance:\n  Mass: 278.54 kg\n  Factor of Safety: 1.19\n  Max Deflection: 4.35e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 278.5362229358863,
      "fos_buckling": 1.1857810649179263,
      "fos_yielding": 2.0156507308865708,
      "deflection": 0.0043479604609123635,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003938)"
      },
      "parent_node_id": "node_2678",
      "improvement_over_parent": null
    },
    "node_2680": {
      "node_id": "node_2680",
      "content": "MODIFICATION: Increase 7 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0084)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n\nPerformance:\n  Mass: 294.49 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.22e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.48560424964154,
      "fos_buckling": 1.261138958315492,
      "fos_yielding": 2.016809799404832,
      "deflection": 0.0042187757951593925,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.565)"
      },
      "parent_node_id": "node_2679",
      "improvement_over_parent": null
    },
    "node_2681": {
      "node_id": "node_2681",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2680",
      "improvement_over_parent": null
    },
    "node_2682": {
      "node_id": "node_2682",
      "content": "INITIAL DESIGN (Trace 388)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 182.54 kg\n  Factor of Safety: 0.76\n  Max Deflection: 7.17e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.54317990731934,
      "fos_buckling": 0.7568546704454642,
      "fos_yielding": 0.9418137401830929,
      "deflection": 0.00716516398731574,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2683": {
      "node_id": "node_2683",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n\nPerformance:\n  Mass: 205.93 kg\n  Factor of Safety: 0.85\n  Max Deflection: 5.80e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 205.93259470793728,
      "fos_buckling": 0.846609609356389,
      "fos_yielding": 0.9484389317806874,
      "deflection": 0.005801243977798836,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003721)"
      },
      "parent_node_id": "node_2682",
      "improvement_over_parent": null
    },
    "node_2684": {
      "node_id": "node_2684",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 237.89 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.03e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.8906071005922,
      "fos_buckling": 0.96891796237954,
      "fos_yielding": 1.0988157844270112,
      "deflection": 0.005030280915270486,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.167)"
      },
      "parent_node_id": "node_2683",
      "improvement_over_parent": null
    },
    "node_2685": {
      "node_id": "node_2685",
      "content": "MODIFICATION: Increase 6 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 240.71 kg\n  Factor of Safety: 1.29\n  Max Deflection: 4.91e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.71392241672802,
      "fos_buckling": 1.294335171261828,
      "fos_yielding": 1.6532674709449042,
      "deflection": 0.004907245177846747,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.567)"
      },
      "parent_node_id": "node_2684",
      "improvement_over_parent": null
    },
    "node_2686": {
      "node_id": "node_2686",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.11 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.10708580110054,
      "fos_buckling": 1.5223403651949334,
      "fos_yielding": 2.0107557914427465,
      "deflection": 0.004042335065141988,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.239)"
      },
      "parent_node_id": "node_2685",
      "improvement_over_parent": null
    },
    "node_2687": {
      "node_id": "node_2687",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2686",
      "improvement_over_parent": null
    },
    "node_2688": {
      "node_id": "node_2688",
      "content": "INITIAL DESIGN (Trace 389)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 227.64 kg\n  Factor of Safety: 0.86\n  Max Deflection: 5.89e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.63740062275247,
      "fos_buckling": 0.8581128556949579,
      "fos_yielding": 2.2892797716277644,
      "deflection": 0.0058894685884908395,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2689": {
      "node_id": "node_2689",
      "content": "MODIFICATION: Increase 1 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 236.17 kg\n  Factor of Safety: 0.86\n  Max Deflection: 5.46e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.17380842677363,
      "fos_buckling": 0.8576099975069237,
      "fos_yielding": 2.2892797716277644,
      "deflection": 0.00545909082744597,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.353)"
      },
      "parent_node_id": "node_2688",
      "improvement_over_parent": null
    },
    "node_2690": {
      "node_id": "node_2690",
      "content": "MODIFICATION: Increase 3 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 244.65 kg\n  Factor of Safety: 0.86\n  Max Deflection: 5.46e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.6528971127514,
      "fos_buckling": 0.8571110989355805,
      "fos_yielding": 2.2880734972210215,
      "deflection": 0.005462203712569167,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.585)"
      },
      "parent_node_id": "node_2689",
      "improvement_over_parent": null
    },
    "node_2691": {
      "node_id": "node_2691",
      "content": "MODIFICATION: Increase 9 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 255.07 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.99e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.07365453510536,
      "fos_buckling": 1.072722749515726,
      "fos_yielding": 2.2880734972210215,
      "deflection": 0.004988018285591419,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.335)"
      },
      "parent_node_id": "node_2690",
      "improvement_over_parent": null
    },
    "node_2692": {
      "node_id": "node_2692",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 286.05 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.19e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 286.0522005841817,
      "fos_buckling": 1.5193553738679766,
      "fos_yielding": 2.013943686207937,
      "deflection": 0.004186044377424478,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2691",
      "improvement_over_parent": null
    },
    "node_2693": {
      "node_id": "node_2693",
      "content": "MODIFICATION: Increase 0 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1898521224266,
      "fos_buckling": 1.5223131613611511,
      "fos_yielding": 2.0124495548199945,
      "deflection": 0.004041152394389481,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.292)"
      },
      "parent_node_id": "node_2692",
      "improvement_over_parent": null
    },
    "node_2694": {
      "node_id": "node_2694",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2693",
      "improvement_over_parent": null
    },
    "node_2695": {
      "node_id": "node_2695",
      "content": "INITIAL DESIGN (Trace 390)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 178.76 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.68e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.76207523000494,
      "fos_buckling": 0.9033102489743667,
      "fos_yielding": 1.4150857289346206,
      "deflection": 0.00668046726961597,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2696": {
      "node_id": "node_2696",
      "content": "MODIFICATION: Increase 7 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 183.80 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.51e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.79995721182232,
      "fos_buckling": 0.8997534210281596,
      "fos_yielding": 1.4144264571721399,
      "deflection": 0.006510046166137617,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.212)"
      },
      "parent_node_id": "node_2695",
      "improvement_over_parent": null
    },
    "node_2697": {
      "node_id": "node_2697",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 217.48 kg\n  Factor of Safety: 1.05\n  Max Deflection: 5.51e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.47972819489615,
      "fos_buckling": 1.0497915659712347,
      "fos_yielding": 1.6704683957738877,
      "deflection": 0.005510559640372479,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.196)"
      },
      "parent_node_id": "node_2696",
      "improvement_over_parent": null
    },
    "node_2698": {
      "node_id": "node_2698",
      "content": "MODIFICATION: Increase 3 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 224.20 kg\n  Factor of Safety: 1.34\n  Max Deflection: 5.38e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.19936412787007,
      "fos_buckling": 1.3405691333647245,
      "fos_yielding": 1.6466238733441658,
      "deflection": 0.005377952142010364,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.536)"
      },
      "parent_node_id": "node_2697",
      "improvement_over_parent": null
    },
    "node_2699": {
      "node_id": "node_2699",
      "content": "MODIFICATION: Increase 8 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 228.91 kg\n  Factor of Safety: 1.33\n  Max Deflection: 5.30e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.90979954903452,
      "fos_buckling": 1.334481126984164,
      "fos_yielding": 1.6471631532597588,
      "deflection": 0.0053017582174801235,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.225)"
      },
      "parent_node_id": "node_2698",
      "improvement_over_parent": null
    },
    "node_2700": {
      "node_id": "node_2700",
      "content": "MODIFICATION: Increase 0 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 236.03 kg\n  Factor of Safety: 1.30\n  Max Deflection: 5.08e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.02744718729457,
      "fos_buckling": 1.304543457421919,
      "fos_yielding": 1.6457496665566178,
      "deflection": 0.005081444521970318,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.364)"
      },
      "parent_node_id": "node_2699",
      "improvement_over_parent": null
    },
    "node_2701": {
      "node_id": "node_2701",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 284.93 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.22e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 284.9343019205503,
      "fos_buckling": 1.5226242354587463,
      "fos_yielding": 1.984175325758707,
      "deflection": 0.0042197361784343315,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.227)"
      },
      "parent_node_id": "node_2700",
      "improvement_over_parent": null
    },
    "node_2702": {
      "node_id": "node_2702",
      "content": "MODIFICATION: Increase 1 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.35 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3464761578295,
      "fos_buckling": 1.5231433062468844,
      "fos_yielding": 2.0130605490237503,
      "deflection": 0.0040388679193884384,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.346)"
      },
      "parent_node_id": "node_2701",
      "improvement_over_parent": null
    },
    "node_2703": {
      "node_id": "node_2703",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2702",
      "improvement_over_parent": null
    },
    "node_2704": {
      "node_id": "node_2704",
      "content": "INITIAL DESIGN (Trace 391)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 156.02 kg\n  Factor of Safety: 1.17\n  Max Deflection: 7.98e+12 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 156.02280618806486,
      "fos_buckling": 1.1675980158649941,
      "fos_yielding": 1.5895416476863928,
      "deflection": 7976517990649.336,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2705": {
      "node_id": "node_2705",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 182.66 kg\n  Factor of Safety: 0.49\n  Max Deflection: 9.65e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.66155556188897,
      "fos_buckling": 0.49489135014159125,
      "fos_yielding": 1.5435842308422734,
      "deflection": 0.009653893742160188,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004277)"
      },
      "parent_node_id": "node_2704",
      "improvement_over_parent": null
    },
    "node_2706": {
      "node_id": "node_2706",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n\nPerformance:\n  Mass: 202.40 kg\n  Factor of Safety: 0.49\n  Max Deflection: 8.86e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 202.4008842430041,
      "fos_buckling": 0.49421928853202335,
      "fos_yielding": 1.542469185285583,
      "deflection": 0.008862711726432923,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003865)"
      },
      "parent_node_id": "node_2705",
      "improvement_over_parent": null
    },
    "node_2707": {
      "node_id": "node_2707",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 249.96 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.20e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.96150445618838,
      "fos_buckling": 0.5882769238501112,
      "fos_yielding": 1.9000287713277466,
      "deflection": 0.007196122838590377,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.258)"
      },
      "parent_node_id": "node_2706",
      "improvement_over_parent": null
    },
    "node_2708": {
      "node_id": "node_2708",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1595623936406,
      "fos_buckling": 1.5225740712941942,
      "fos_yielding": 2.01189516454934,
      "deflection": 0.004041568519652857,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2707",
      "improvement_over_parent": null
    },
    "node_2709": {
      "node_id": "node_2709",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2708",
      "improvement_over_parent": null
    },
    "node_2710": {
      "node_id": "node_2710",
      "content": "INITIAL DESIGN (Trace 392)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2711": {
      "node_id": "node_2711",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 216.52 kg\n  Factor of Safety: 0.65\n  Max Deflection: 1.59e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.51599144005465,
      "fos_buckling": 0.6545951193452767,
      "fos_yielding": 1.1253073712763755,
      "deflection": 15865731448821.848,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2710",
      "improvement_over_parent": null
    },
    "node_2712": {
      "node_id": "node_2712",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 247.49 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.72e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.494537489131,
      "fos_buckling": 0.5216621332867974,
      "fos_yielding": 1.5726989312953537,
      "deflection": 0.007718254011294596,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2711",
      "improvement_over_parent": null
    },
    "node_2713": {
      "node_id": "node_2713",
      "content": "MODIFICATION: Increase 5 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0060)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 250.22 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.57e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.22496142923075,
      "fos_buckling": 0.5216621332867974,
      "fos_yielding": 1.6289331209834133,
      "deflection": 0.007568064276547469,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.311)"
      },
      "parent_node_id": "node_2712",
      "improvement_over_parent": null
    },
    "node_2714": {
      "node_id": "node_2714",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0060)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 294.81 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.8068925971766,
      "fos_buckling": 1.4753148785702723,
      "fos_yielding": 2.556946221785321,
      "deflection": 0.0040511173763685656,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2713",
      "improvement_over_parent": null
    },
    "node_2715": {
      "node_id": "node_2715",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2714",
      "improvement_over_parent": null
    },
    "node_2716": {
      "node_id": "node_2716",
      "content": "INITIAL DESIGN (Trace 393)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 249.36 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.04e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.3620729426449,
      "fos_buckling": 1.0733793258776287,
      "fos_yielding": 1.7981632048192344,
      "deflection": 0.005043422832551332,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2717": {
      "node_id": "node_2717",
      "content": "MODIFICATION: Increase 6 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 251.50 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.04e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.49542380860152,
      "fos_buckling": 1.0733793258776287,
      "fos_yielding": 2.287645625767265,
      "deflection": 0.005043422832551332,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.299)"
      },
      "parent_node_id": "node_2716",
      "improvement_over_parent": null
    },
    "node_2718": {
      "node_id": "node_2718",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 282.47 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.25e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.4739698576779,
      "fos_buckling": 1.2823485353407762,
      "fos_yielding": 2.014150547791207,
      "deflection": 0.004245071745248123,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2717",
      "improvement_over_parent": null
    },
    "node_2719": {
      "node_id": "node_2719",
      "content": "MODIFICATION: Increase 7 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.23643272156994,
      "fos_buckling": 1.522850539373779,
      "fos_yielding": 2.0120784683763544,
      "deflection": 0.00404052833751919,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.364)"
      },
      "parent_node_id": "node_2718",
      "improvement_over_parent": null
    },
    "node_2720": {
      "node_id": "node_2720",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2719",
      "improvement_over_parent": null
    },
    "node_2721": {
      "node_id": "node_2721",
      "content": "INITIAL DESIGN (Trace 394)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2722": {
      "node_id": "node_2722",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 183.91 kg\n  Factor of Safety: 0.34\n  Max Deflection: 2.82e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.90855805146234,
      "fos_buckling": 0.335122358894305,
      "fos_yielding": 1.154441039946126,
      "deflection": 0.028175432723844405,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003447)"
      },
      "parent_node_id": "node_2721",
      "improvement_over_parent": null
    },
    "node_2723": {
      "node_id": "node_2723",
      "content": "MODIFICATION: Increase 8 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 194.43 kg\n  Factor of Safety: 0.42\n  Max Deflection: 2.50e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.4349108763279,
      "fos_buckling": 0.41990911802686187,
      "fos_yielding": 1.5421558636902573,
      "deflection": 0.025041965242694614,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.443)"
      },
      "parent_node_id": "node_2722",
      "improvement_over_parent": null
    },
    "node_2724": {
      "node_id": "node_2724",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 240.38 kg\n  Factor of Safety: 0.51\n  Max Deflection: 2.03e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.37852968264443,
      "fos_buckling": 0.5050382786410501,
      "fos_yielding": 1.9013323370011759,
      "deflection": 0.020279447760324375,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.259)"
      },
      "parent_node_id": "node_2723",
      "improvement_over_parent": null
    },
    "node_2725": {
      "node_id": "node_2725",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 245.59 kg\n  Factor of Safety: 0.50\n  Max Deflection: 7.56e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.59235971645853,
      "fos_buckling": 0.5046769884217633,
      "fos_yielding": 1.9006082933871122,
      "deflection": 0.007562036507977585,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2724",
      "improvement_over_parent": null
    },
    "node_2726": {
      "node_id": "node_2726",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 288.79 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.79041765391077,
      "fos_buckling": 1.4910556630535425,
      "fos_yielding": 2.010968206401512,
      "deflection": 0.0040855175549445325,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2725",
      "improvement_over_parent": null
    },
    "node_2727": {
      "node_id": "node_2727",
      "content": "MODIFICATION: Increase 2 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.12805283162066,
      "fos_buckling": 1.5224382777940464,
      "fos_yielding": 2.0115576818583016,
      "deflection": 0.004041959600965796,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.221)"
      },
      "parent_node_id": "node_2726",
      "improvement_over_parent": null
    },
    "node_2728": {
      "node_id": "node_2728",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2727",
      "improvement_over_parent": null
    },
    "node_2729": {
      "node_id": "node_2729",
      "content": "INITIAL DESIGN (Trace 395)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2730": {
      "node_id": "node_2730",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 188.05 kg\n  Factor of Safety: 0.88\n  Max Deflection: 1.47e+11 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 188.04737713977647,
      "fos_buckling": 0.8782285280424161,
      "fos_yielding": 1.918607104428292,
      "deflection": 146792642805.38254,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004440)"
      },
      "parent_node_id": "node_2729",
      "improvement_over_parent": null
    },
    "node_2731": {
      "node_id": "node_2731",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 192.42 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.05e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 192.41654314685965,
      "fos_buckling": 0.8725344172520175,
      "fos_yielding": 1.918607104428292,
      "deflection": 0.007052521507410416,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002727)"
      },
      "parent_node_id": "node_2730",
      "improvement_over_parent": null
    },
    "node_2732": {
      "node_id": "node_2732",
      "content": "MODIFICATION: Increase 2 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 198.05 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.06e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.04617883273326,
      "fos_buckling": 0.8721963758754355,
      "fos_yielding": 1.9179356533557748,
      "deflection": 0.00705525014731051,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.410)"
      },
      "parent_node_id": "node_2731",
      "improvement_over_parent": null
    },
    "node_2733": {
      "node_id": "node_2733",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n\nPerformance:\n  Mass: 219.75 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.77e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.74708033899006,
      "fos_buckling": 0.9276124409648904,
      "fos_yielding": 1.9179356533557748,
      "deflection": 0.005774119102987629,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004134)"
      },
      "parent_node_id": "node_2732",
      "improvement_over_parent": null
    },
    "node_2734": {
      "node_id": "node_2734",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 245.70 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.81e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.70451256827536,
      "fos_buckling": 1.3168973980362875,
      "fos_yielding": 1.688124744727875,
      "deflection": 0.004808921876231619,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004307)"
      },
      "parent_node_id": "node_2733",
      "improvement_over_parent": null
    },
    "node_2735": {
      "node_id": "node_2735",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.13433168433255,
      "fos_buckling": 1.5224864980222461,
      "fos_yielding": 2.0118415113180124,
      "deflection": 0.004041929335765918,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.212)"
      },
      "parent_node_id": "node_2734",
      "improvement_over_parent": null
    },
    "node_2736": {
      "node_id": "node_2736",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2735",
      "improvement_over_parent": null
    },
    "node_2737": {
      "node_id": "node_2737",
      "content": "INITIAL DESIGN (Trace 396)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 200.11 kg\n  Factor of Safety: 0.98\n  Max Deflection: 6.02e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.11426158669673,
      "fos_buckling": 0.9814738316774668,
      "fos_yielding": 1.1150158003245778,
      "deflection": 0.006017914632508003,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2738": {
      "node_id": "node_2738",
      "content": "MODIFICATION: Increase 6 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 201.73 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.72579821943265,
      "fos_buckling": 1.13999636094342,
      "fos_yielding": 1.4320310251834356,
      "deflection": 0.005938351085231358,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.314)"
      },
      "parent_node_id": "node_2737",
      "improvement_over_parent": null
    },
    "node_2739": {
      "node_id": "node_2739",
      "content": "MODIFICATION: Increase 0 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 208.19 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.66e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.18808555336443,
      "fos_buckling": 1.1431825784441167,
      "fos_yielding": 1.4306565559209516,
      "deflection": 0.005663138212338124,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.389)"
      },
      "parent_node_id": "node_2738",
      "improvement_over_parent": null
    },
    "node_2740": {
      "node_id": "node_2740",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 252.85 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.67e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.85426070951806,
      "fos_buckling": 1.3487858272251982,
      "fos_yielding": 1.7358681718849143,
      "deflection": 0.004674877486202466,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.232)"
      },
      "parent_node_id": "node_2739",
      "improvement_over_parent": null
    },
    "node_2741": {
      "node_id": "node_2741",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.136236518331,
      "fos_buckling": 1.5223900194261315,
      "fos_yielding": 2.010601678336677,
      "deflection": 0.004041897628399714,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.175)"
      },
      "parent_node_id": "node_2740",
      "improvement_over_parent": null
    },
    "node_2742": {
      "node_id": "node_2742",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2741",
      "improvement_over_parent": null
    },
    "node_2743": {
      "node_id": "node_2743",
      "content": "INITIAL DESIGN (Trace 397)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 209.99 kg\n  Factor of Safety: 0.59\n  Max Deflection: 6.93e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.99246186149665,
      "fos_buckling": 0.5868010461492563,
      "fos_yielding": 1.7217335275683132,
      "deflection": 0.0069340593229143144,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2744": {
      "node_id": "node_2744",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 244.17 kg\n  Factor of Safety: 0.67\n  Max Deflection: 5.97e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.17172809357746,
      "fos_buckling": 0.6739363234478979,
      "fos_yielding": 1.999005799320797,
      "deflection": 0.005965261087090127,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.178)"
      },
      "parent_node_id": "node_2743",
      "improvement_over_parent": null
    },
    "node_2745": {
      "node_id": "node_2745",
      "content": "MODIFICATION: Increase 7 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.36 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.3575331051524,
      "fos_buckling": 1.007893628422676,
      "fos_yielding": 1.9986751656402009,
      "deflection": 0.005005556201275767,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.656)"
      },
      "parent_node_id": "node_2744",
      "improvement_over_parent": null
    },
    "node_2746": {
      "node_id": "node_2746",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2700697367694,
      "fos_buckling": 1.5229102115895743,
      "fos_yielding": 2.0124593426676927,
      "deflection": 0.004040045372791036,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2745",
      "improvement_over_parent": null
    },
    "node_2747": {
      "node_id": "node_2747",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2746",
      "improvement_over_parent": null
    },
    "node_2748": {
      "node_id": "node_2748",
      "content": "INITIAL DESIGN (Trace 398)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0019)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0020)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 114.07 kg\n  Factor of Safety: 0.56\n  Max Deflection: 1.17e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 114.06567227550593,
      "fos_buckling": 0.56034398574985,
      "fos_yielding": 1.0820938851108264,
      "deflection": 0.011678305460048104,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2749": {
      "node_id": "node_2749",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 144.73 kg\n  Factor of Safety: 0.69\n  Max Deflection: 9.21e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 144.73330025894882,
      "fos_buckling": 0.6942623724522483,
      "fos_yielding": 1.3716353421617486,
      "deflection": 0.009214909782575916,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.282)"
      },
      "parent_node_id": "node_2748",
      "improvement_over_parent": null
    },
    "node_2750": {
      "node_id": "node_2750",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 170.96 kg\n  Factor of Safety: 0.80\n  Max Deflection: 7.81e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.96258943035838,
      "fos_buckling": 0.8032586648233647,
      "fos_yielding": 1.6187655976211048,
      "deflection": 0.007809022367639482,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_2749",
      "improvement_over_parent": null
    },
    "node_2751": {
      "node_id": "node_2751",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 208.33 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.42e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.32886165918654,
      "fos_buckling": 0.9497886622728225,
      "fos_yielding": 1.9699767877465983,
      "deflection": 0.006417331960879504,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.235)"
      },
      "parent_node_id": "node_2750",
      "improvement_over_parent": null
    },
    "node_2752": {
      "node_id": "node_2752",
      "content": "MODIFICATION: Increase 1 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 216.41 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.40796277963517,
      "fos_buckling": 0.9492612422556737,
      "fos_yielding": 1.9699767877465983,
      "deflection": 0.0058485898090740755,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.395)"
      },
      "parent_node_id": "node_2751",
      "improvement_over_parent": null
    },
    "node_2753": {
      "node_id": "node_2753",
      "content": "MODIFICATION: Increase 7 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 225.72 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.62e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.71885385041816,
      "fos_buckling": 0.948654134566684,
      "fos_yielding": 1.9699767877465983,
      "deflection": 0.005623616217351672,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.361)"
      },
      "parent_node_id": "node_2752",
      "improvement_over_parent": null
    },
    "node_2754": {
      "node_id": "node_2754",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 252.37 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.68e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.37242791778272,
      "fos_buckling": 1.3467746115996664,
      "fos_yielding": 1.7337594705655424,
      "deflection": 0.0046836045288188325,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004432)"
      },
      "parent_node_id": "node_2753",
      "improvement_over_parent": null
    },
    "node_2755": {
      "node_id": "node_2755",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2655701073498,
      "fos_buckling": 1.523073771497353,
      "fos_yielding": 2.012831577111337,
      "deflection": 0.004040088527962239,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.178)"
      },
      "parent_node_id": "node_2754",
      "improvement_over_parent": null
    },
    "node_2756": {
      "node_id": "node_2756",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2755",
      "improvement_over_parent": null
    },
    "node_2757": {
      "node_id": "node_2757",
      "content": "INITIAL DESIGN (Trace 399)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 143.83 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.59e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 143.83313945477465,
      "fos_buckling": 0.4342727109144216,
      "fos_yielding": 0.7769485620674502,
      "deflection": 0.015911067029028395,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2758": {
      "node_id": "node_2758",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 180.75 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.27e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.74546816726894,
      "fos_buckling": 0.5241393189388992,
      "fos_yielding": 0.9811486612729965,
      "deflection": 0.012677423442334782,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.279)"
      },
      "parent_node_id": "node_2757",
      "improvement_over_parent": null
    },
    "node_2759": {
      "node_id": "node_2759",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 223.94 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.28e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.94352610472117,
      "fos_buckling": 0.5225841068982027,
      "fos_yielding": 0.9802429603821471,
      "deflection": 0.008284012519943061,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2758",
      "improvement_over_parent": null
    },
    "node_2760": {
      "node_id": "node_2760",
      "content": "MODIFICATION: Increase 6 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 227.70 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.86e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.70457780202213,
      "fos_buckling": 0.5225841068982027,
      "fos_yielding": 1.5737535502167825,
      "deflection": 0.007861218121765367,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.664)"
      },
      "parent_node_id": "node_2759",
      "improvement_over_parent": null
    },
    "node_2761": {
      "node_id": "node_2761",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 272.29 kg\n  Factor of Safety: 1.50\n  Max Deflection: 4.39e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 272.286508969968,
      "fos_buckling": 1.5032398700799532,
      "fos_yielding": 2.0130053046411205,
      "deflection": 0.004394599144376651,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2760",
      "improvement_over_parent": null
    },
    "node_2762": {
      "node_id": "node_2762",
      "content": "MODIFICATION: Increase 0 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 281.15 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.17e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.15164186639345,
      "fos_buckling": 1.4239356794316067,
      "fos_yielding": 2.0111876476744643,
      "deflection": 0.004172933098575874,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.387)"
      },
      "parent_node_id": "node_2761",
      "improvement_over_parent": null
    },
    "node_2763": {
      "node_id": "node_2763",
      "content": "MODIFICATION: Increase 8 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0086)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 298.15 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 298.153779399004,
      "fos_buckling": 1.419322343991241,
      "fos_yielding": 1.981643521101328,
      "deflection": 0.004080940023318572,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.645)"
      },
      "parent_node_id": "node_2762",
      "improvement_over_parent": null
    },
    "node_2764": {
      "node_id": "node_2764",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2763",
      "improvement_over_parent": null
    },
    "node_2765": {
      "node_id": "node_2765",
      "content": "INITIAL DESIGN (Trace 400)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0021)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n\nPerformance:\n  Mass: 101.55 kg\n  Factor of Safety: 0.28\n  Max Deflection: 1.69e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 101.55309682897122,
      "fos_buckling": 0.28082455849287363,
      "fos_yielding": 0.7711003218287948,
      "deflection": 0.01686956790850211,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2766": {
      "node_id": "node_2766",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0021)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0023)]\n\nPerformance:\n  Mass: 118.83 kg\n  Factor of Safety: 0.54\n  Max Deflection: 1.08e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 118.83253020829851,
      "fos_buckling": 0.54204643333376,
      "fos_yielding": 0.9551349794304415,
      "deflection": 0.010786420077860726,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.002296)"
      },
      "parent_node_id": "node_2765",
      "improvement_over_parent": null
    },
    "node_2767": {
      "node_id": "node_2767",
      "content": "MODIFICATION: Increase 1 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0023)]\n\nPerformance:\n  Mass: 122.60 kg\n  Factor of Safety: 0.54\n  Max Deflection: 1.05e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 122.60329203639556,
      "fos_buckling": 0.5419050789505193,
      "fos_yielding": 0.9658776668080467,
      "deflection": 0.010503747215841491,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.294)"
      },
      "parent_node_id": "node_2766",
      "improvement_over_parent": null
    },
    "node_2768": {
      "node_id": "node_2768",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 158.09 kg\n  Factor of Safety: 0.68\n  Max Deflection: 8.16e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 158.08845024374529,
      "fos_buckling": 0.680624732434929,
      "fos_yielding": 1.2440511080451582,
      "deflection": 0.008163859220858218,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.305)"
      },
      "parent_node_id": "node_2767",
      "improvement_over_parent": null
    },
    "node_2769": {
      "node_id": "node_2769",
      "content": "MODIFICATION: Increase 9 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 163.82 kg\n  Factor of Safety: 0.68\n  Max Deflection: 7.91e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 163.82136803552572,
      "fos_buckling": 0.6803556156689203,
      "fos_yielding": 1.2605652448328828,
      "deflection": 0.007909067158352085,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.271)"
      },
      "parent_node_id": "node_2768",
      "improvement_over_parent": null
    },
    "node_2770": {
      "node_id": "node_2770",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n\nPerformance:\n  Mass: 184.53 kg\n  Factor of Safety: 1.03\n  Max Deflection: 6.38e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.5281834891474,
      "fos_buckling": 1.0288545144446557,
      "fos_yielding": 1.2694123350343514,
      "deflection": 0.00638024775691196,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003270)"
      },
      "parent_node_id": "node_2769",
      "improvement_over_parent": null
    },
    "node_2771": {
      "node_id": "node_2771",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n\nPerformance:\n  Mass: 235.04 kg\n  Factor of Safety: 1.27\n  Max Deflection: 5.02e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.03517717095593,
      "fos_buckling": 1.2686420187158491,
      "fos_yielding": 1.615023286812568,
      "deflection": 0.005023936194376488,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.294)"
      },
      "parent_node_id": "node_2770",
      "improvement_over_parent": null
    },
    "node_2772": {
      "node_id": "node_2772",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2629358792096,
      "fos_buckling": 1.5231512702147256,
      "fos_yielding": 2.0124924061117553,
      "deflection": 0.004040053240724398,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.272)"
      },
      "parent_node_id": "node_2771",
      "improvement_over_parent": null
    },
    "node_2773": {
      "node_id": "node_2773",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2772",
      "improvement_over_parent": null
    },
    "node_2774": {
      "node_id": "node_2774",
      "content": "INITIAL DESIGN (Trace 401)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0019)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0024)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 119.55 kg\n  Factor of Safety: 0.59\n  Max Deflection: 1.05e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 119.55199935480636,
      "fos_buckling": 0.5872130050714742,
      "fos_yielding": 1.138992028927665,
      "deflection": 0.010473848010795183,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2775": {
      "node_id": "node_2775",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0021)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0024)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 132.94 kg\n  Factor of Safety: 0.65\n  Max Deflection: 9.43e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 132.94053637119399,
      "fos_buckling": 0.6461973779177751,
      "fos_yielding": 1.2659744505076944,
      "deflection": 0.009426909801980167,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.117)"
      },
      "parent_node_id": "node_2774",
      "improvement_over_parent": null
    },
    "node_2776": {
      "node_id": "node_2776",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 166.00 kg\n  Factor of Safety: 0.79\n  Max Deflection: 7.56e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.0041877318728,
      "fos_buckling": 0.7861014588229958,
      "fos_yielding": 1.5790282138734983,
      "deflection": 0.007564929730385465,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.263)"
      },
      "parent_node_id": "node_2775",
      "improvement_over_parent": null
    },
    "node_2777": {
      "node_id": "node_2777",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 187.48 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.71e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.48006256749855,
      "fos_buckling": 0.8726079895831852,
      "fos_yielding": 1.7819427118594322,
      "deflection": 0.006707349170343997,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_2776",
      "improvement_over_parent": null
    },
    "node_2778": {
      "node_id": "node_2778",
      "content": "MODIFICATION: Increase 0 thickness by 45%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 195.32 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.47e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.3159316082973,
      "fos_buckling": 0.872137365690753,
      "fos_yielding": 1.7819427118594322,
      "deflection": 0.00647327699904474,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.451)"
      },
      "parent_node_id": "node_2777",
      "improvement_over_parent": null
    },
    "node_2779": {
      "node_id": "node_2779",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 251.38 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.05e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.38215833708253,
      "fos_buckling": 1.0743379575977312,
      "fos_yielding": 2.2905356288756793,
      "deflection": 0.005046685141681958,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.314)"
      },
      "parent_node_id": "node_2778",
      "improvement_over_parent": null
    },
    "node_2780": {
      "node_id": "node_2780",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 282.36 kg\n  Factor of Safety: 1.27\n  Max Deflection: 4.25e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.3607043861589,
      "fos_buckling": 1.2744948181176474,
      "fos_yielding": 2.016845190264692,
      "deflection": 0.004249934578220702,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2779",
      "improvement_over_parent": null
    },
    "node_2781": {
      "node_id": "node_2781",
      "content": "MODIFICATION: Increase 7 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.51 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.5060384033419,
      "fos_buckling": 1.5239939749194165,
      "fos_yielding": 2.014682367559341,
      "deflection": 0.00403670399725146,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.381)"
      },
      "parent_node_id": "node_2780",
      "improvement_over_parent": null
    },
    "node_2782": {
      "node_id": "node_2782",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2781",
      "improvement_over_parent": null
    },
    "node_2783": {
      "node_id": "node_2783",
      "content": "INITIAL DESIGN (Trace 402)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 173.06 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.49e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.0585277486877,
      "fos_buckling": 0.7391065750605911,
      "fos_yielding": 1.473601059968934,
      "deflection": 0.007493619725863724,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2784": {
      "node_id": "node_2784",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 194.33 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.68e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.3266750565006,
      "fos_buckling": 0.8176686098970141,
      "fos_yielding": 1.6543670788823963,
      "deflection": 0.006682411942104689,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.131)"
      },
      "parent_node_id": "node_2783",
      "improvement_over_parent": null
    },
    "node_2785": {
      "node_id": "node_2785",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 235.60 kg\n  Factor of Safety: 0.96\n  Max Deflection: 5.53e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.59623700896324,
      "fos_buckling": 0.9625691773549012,
      "fos_yielding": 2.00492506789283,
      "deflection": 0.0055261480494083175,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.230)"
      },
      "parent_node_id": "node_2784",
      "improvement_over_parent": null
    },
    "node_2786": {
      "node_id": "node_2786",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n\nPerformance:\n  Mass: 256.95 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.60e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.94738625714007,
      "fos_buckling": 1.3670148330641594,
      "fos_yielding": 1.7650538012708716,
      "deflection": 0.004601405378568775,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004207)"
      },
      "parent_node_id": "node_2785",
      "improvement_over_parent": null
    },
    "node_2787": {
      "node_id": "node_2787",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.43 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4284108816205,
      "fos_buckling": 1.5236910329298605,
      "fos_yielding": 2.0139951343634257,
      "deflection": 0.004037859173299243,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.156)"
      },
      "parent_node_id": "node_2786",
      "improvement_over_parent": null
    },
    "node_2788": {
      "node_id": "node_2788",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2787",
      "improvement_over_parent": null
    },
    "node_2789": {
      "node_id": "node_2789",
      "content": "INITIAL DESIGN (Trace 403)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 158.03 kg\n  Factor of Safety: 0.76\n  Max Deflection: 9.45e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 158.02598132592777,
      "fos_buckling": 0.7602356717546531,
      "fos_yielding": 1.6316189786556012,
      "deflection": 0.009452324795094471,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2790": {
      "node_id": "node_2790",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n\nPerformance:\n  Mass: 181.49 kg\n  Factor of Safety: 0.81\n  Max Deflection: 7.25e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.48619975757504,
      "fos_buckling": 0.808437064264359,
      "fos_yielding": 1.5932310752617285,
      "deflection": 0.007249672856517347,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003733)"
      },
      "parent_node_id": "node_2789",
      "improvement_over_parent": null
    },
    "node_2791": {
      "node_id": "node_2791",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n\nPerformance:\n  Mass: 201.99 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.52e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.99432864601056,
      "fos_buckling": 0.885943139620162,
      "fos_yielding": 1.7742721509805723,
      "deflection": 0.00652066801970136,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.121)"
      },
      "parent_node_id": "node_2790",
      "improvement_over_parent": null
    },
    "node_2792": {
      "node_id": "node_2792",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 254.64 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.19e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.63726712303784,
      "fos_buckling": 1.0722842019370054,
      "fos_yielding": 2.240431249154954,
      "deflection": 0.005186825104553827,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.285)"
      },
      "parent_node_id": "node_2791",
      "improvement_over_parent": null
    },
    "node_2793": {
      "node_id": "node_2793",
      "content": "MODIFICATION: Increase 3 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 255.98 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 255.9805009528063,
      "fos_buckling": 1.072284201937005,
      "fos_yielding": 2.2851524708697024,
      "deflection": 0.005144653455350042,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.259)"
      },
      "parent_node_id": "node_2792",
      "improvement_over_parent": null
    },
    "node_2794": {
      "node_id": "node_2794",
      "content": "MODIFICATION: Increase 0 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 259.76 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.04e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.7565092360794,
      "fos_buckling": 1.072006700109789,
      "fos_yielding": 2.2851524708697033,
      "deflection": 0.00503504167603752,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.189)"
      },
      "parent_node_id": "node_2793",
      "improvement_over_parent": null
    },
    "node_2795": {
      "node_id": "node_2795",
      "content": "MODIFICATION: Increase 0 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 268.61 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.86e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.61087512396165,
      "fos_buckling": 1.071356548721648,
      "fos_yielding": 2.2851524708697024,
      "deflection": 0.0048569979085891475,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.387)"
      },
      "parent_node_id": "node_2794",
      "improvement_over_parent": null
    },
    "node_2796": {
      "node_id": "node_2796",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 292.99 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.9923470847938,
      "fos_buckling": 1.521962416732209,
      "fos_yielding": 2.010648971130428,
      "deflection": 0.004043980777420119,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2795",
      "improvement_over_parent": null
    },
    "node_2797": {
      "node_id": "node_2797",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2796",
      "improvement_over_parent": null
    },
    "node_2798": {
      "node_id": "node_2798",
      "content": "INITIAL DESIGN (Trace 404)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0033)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n\nPerformance:\n  Mass: 109.07 kg\n  Factor of Safety: 0.52\n  Max Deflection: 2.68e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 109.07489516601825,
      "fos_buckling": 0.5155285969988027,
      "fos_yielding": 1.3389980680505715,
      "deflection": 26844751930416.15,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2799": {
      "node_id": "node_2799",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n\nPerformance:\n  Mass: 140.11 kg\n  Factor of Safety: 0.13\n  Max Deflection: 1.60e+14 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 140.10788719454865,
      "fos_buckling": 0.12842456540666358,
      "fos_yielding": 0.47062559318184194,
      "deflection": 160220099630812.66,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_2798",
      "improvement_over_parent": null
    },
    "node_2800": {
      "node_id": "node_2800",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M7: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n\nPerformance:\n  Mass: 144.02 kg\n  Factor of Safety: 0.25\n  Max Deflection: 2.23e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 144.02343859051757,
      "fos_buckling": 0.25031836163417115,
      "fos_yielding": 0.5626536856381877,
      "deflection": 22303712370333.04,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002424)"
      },
      "parent_node_id": "node_2799",
      "improvement_over_parent": null
    },
    "node_2801": {
      "node_id": "node_2801",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M7: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n\nPerformance:\n  Mass: 163.47 kg\n  Factor of Safety: 0.26\n  Max Deflection: 4.23e+13 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 163.47296564313584,
      "fos_buckling": 0.25684913081332716,
      "fos_yielding": 0.9412511863636839,
      "deflection": 42283265798926.484,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003675)"
      },
      "parent_node_id": "node_2800",
      "improvement_over_parent": null
    },
    "node_2802": {
      "node_id": "node_2802",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M7: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n\nPerformance:\n  Mass: 186.74 kg\n  Factor of Safety: 0.41\n  Max Deflection: 9.98e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.74426792677934,
      "fos_buckling": 0.41097199724286254,
      "fos_yielding": 1.1834133473732764,
      "deflection": 0.009978089130225062,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003830)"
      },
      "parent_node_id": "node_2801",
      "improvement_over_parent": null
    },
    "node_2803": {
      "node_id": "node_2803",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 213.86 kg\n  Factor of Safety: 0.46\n  Max Deflection: 8.73e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.85540204685458,
      "fos_buckling": 0.46096024609729275,
      "fos_yielding": 1.354057855575939,
      "deflection": 0.008726495923017174,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.157)"
      },
      "parent_node_id": "node_2802",
      "improvement_over_parent": null
    },
    "node_2804": {
      "node_id": "node_2804",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 252.23 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.69e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.23183417849,
      "fos_buckling": 1.346742305131308,
      "fos_yielding": 1.7325288621789288,
      "deflection": 0.00468620645589288,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005320)"
      },
      "parent_node_id": "node_2803",
      "improvement_over_parent": null
    },
    "node_2805": {
      "node_id": "node_2805",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.10 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1047987777244,
      "fos_buckling": 1.5230330145919089,
      "fos_yielding": 2.0114266679399693,
      "deflection": 0.004042291810484273,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.178)"
      },
      "parent_node_id": "node_2804",
      "improvement_over_parent": null
    },
    "node_2806": {
      "node_id": "node_2806",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2805",
      "improvement_over_parent": null
    },
    "node_2807": {
      "node_id": "node_2807",
      "content": "INITIAL DESIGN (Trace 405)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 222.40 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.43e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.40133648129392,
      "fos_buckling": 0.9883547449350908,
      "fos_yielding": 1.5894637335010868,
      "deflection": 0.005426985885536388,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2808": {
      "node_id": "node_2808",
      "content": "MODIFICATION: Increase 7 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 231.39 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.3932087964749,
      "fos_buckling": 1.0266065532534834,
      "fos_yielding": 1.6013904778202597,
      "deflection": 0.0051407337268645605,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.381)"
      },
      "parent_node_id": "node_2807",
      "improvement_over_parent": null
    },
    "node_2809": {
      "node_id": "node_2809",
      "content": "MODIFICATION: Increase 4 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 233.09 kg\n  Factor of Safety: 1.26\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.09433282253127,
      "fos_buckling": 1.259758163202701,
      "fos_yielding": 1.6021109046162276,
      "deflection": 0.005065464728649621,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.468)"
      },
      "parent_node_id": "node_2808",
      "improvement_over_parent": null
    },
    "node_2810": {
      "node_id": "node_2810",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.39 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3897765057687,
      "fos_buckling": 1.5237026435704486,
      "fos_yielding": 2.0137911681568146,
      "deflection": 0.004038545130649029,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.284)"
      },
      "parent_node_id": "node_2809",
      "improvement_over_parent": null
    },
    "node_2811": {
      "node_id": "node_2811",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2810",
      "improvement_over_parent": null
    },
    "node_2812": {
      "node_id": "node_2812",
      "content": "INITIAL DESIGN (Trace 406)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n\nPerformance:\n  Mass: 154.17 kg\n  Factor of Safety: 0.58\n  Max Deflection: 4.00e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 154.17169198865648,
      "fos_buckling": 0.5800543919489807,
      "fos_yielding": 0.28132684281909387,
      "deflection": 40023298405582.65,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2813": {
      "node_id": "node_2813",
      "content": "MODIFICATION: Increase 6 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n\nPerformance:\n  Mass: 163.16 kg\n  Factor of Safety: 0.50\n  Max Deflection: 1.94e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 163.16067714255306,
      "fos_buckling": 0.4995846572121324,
      "fos_yielding": 1.8233562255929197,
      "deflection": 19410050160344.84,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.427)"
      },
      "parent_node_id": "node_2812",
      "improvement_over_parent": null
    },
    "node_2814": {
      "node_id": "node_2814",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n\nPerformance:\n  Mass: 180.90 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.03e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.9002303539713,
      "fos_buckling": 0.3999037979580371,
      "fos_yielding": 1.1466391214352096,
      "deflection": 0.010297164928432186,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003447)"
      },
      "parent_node_id": "node_2813",
      "improvement_over_parent": null
    },
    "node_2815": {
      "node_id": "node_2815",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n\nPerformance:\n  Mass: 200.92 kg\n  Factor of Safety: 0.44\n  Max Deflection: 9.28e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.91524116136185,
      "fos_buckling": 0.43742991283099325,
      "fos_yielding": 1.2726984514651316,
      "deflection": 0.00928186856844579,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.119)"
      },
      "parent_node_id": "node_2814",
      "improvement_over_parent": null
    },
    "node_2816": {
      "node_id": "node_2816",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 236.91 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.98e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.91285061880177,
      "fos_buckling": 1.2766246677544666,
      "fos_yielding": 1.6281825773623702,
      "deflection": 0.004984939358094037,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004965)"
      },
      "parent_node_id": "node_2815",
      "improvement_over_parent": null
    },
    "node_2817": {
      "node_id": "node_2817",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22953432514834,
      "fos_buckling": 1.5223819020761222,
      "fos_yielding": 2.0126579196040995,
      "deflection": 0.0040407248663915565,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.261)"
      },
      "parent_node_id": "node_2816",
      "improvement_over_parent": null
    },
    "node_2818": {
      "node_id": "node_2818",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2817",
      "improvement_over_parent": null
    },
    "node_2819": {
      "node_id": "node_2819",
      "content": "INITIAL DESIGN (Trace 407)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0021)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0027)]\n\nPerformance:\n  Mass: 117.39 kg\n  Factor of Safety: 0.50\n  Max Deflection: 1.31e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 117.38501382758753,
      "fos_buckling": 0.5007114118048076,
      "fos_yielding": 1.021239963454767,
      "deflection": 0.013053719046503669,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2820": {
      "node_id": "node_2820",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 151.47 kg\n  Factor of Safety: 0.63\n  Max Deflection: 1.01e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.4693562525962,
      "fos_buckling": 0.6309297749857391,
      "fos_yielding": 1.315670064486433,
      "deflection": 0.010126752108390199,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.305)"
      },
      "parent_node_id": "node_2819",
      "improvement_over_parent": null
    },
    "node_2821": {
      "node_id": "node_2821",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n\nPerformance:\n  Mass: 154.49 kg\n  Factor of Safety: 0.63\n  Max Deflection: 8.61e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 154.48503030392624,
      "fos_buckling": 0.6306671631776156,
      "fos_yielding": 1.157937135989148,
      "deflection": 0.00860714096521877,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001838)"
      },
      "parent_node_id": "node_2820",
      "improvement_over_parent": null
    },
    "node_2822": {
      "node_id": "node_2822",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n\nPerformance:\n  Mass: 169.46 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.94e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.46174229353733,
      "fos_buckling": 0.9537387582622275,
      "fos_yielding": 1.166188226598999,
      "deflection": 0.00694163677769228,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002786)"
      },
      "parent_node_id": "node_2821",
      "improvement_over_parent": null
    },
    "node_2823": {
      "node_id": "node_2823",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n\nPerformance:\n  Mass: 212.55 kg\n  Factor of Safety: 1.16\n  Max Deflection: 5.55e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.5528225981359,
      "fos_buckling": 1.163945416655444,
      "fos_yielding": 1.4613086239054802,
      "deflection": 0.0055482619466073226,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.271)"
      },
      "parent_node_id": "node_2822",
      "improvement_over_parent": null
    },
    "node_2824": {
      "node_id": "node_2824",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n\nPerformance:\n  Mass: 253.62 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.66e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.61896032102038,
      "fos_buckling": 1.3522569132986084,
      "fos_yielding": 1.7420279202945919,
      "deflection": 0.004660994811273639,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.209)"
      },
      "parent_node_id": "node_2823",
      "improvement_over_parent": null
    },
    "node_2825": {
      "node_id": "node_2825",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.10 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0988164358571,
      "fos_buckling": 1.5223145091961792,
      "fos_yielding": 2.011414964959475,
      "deflection": 0.004042410475596859,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_2824",
      "improvement_over_parent": null
    },
    "node_2826": {
      "node_id": "node_2826",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2825",
      "improvement_over_parent": null
    },
    "node_2827": {
      "node_id": "node_2827",
      "content": "INITIAL DESIGN (Trace 408)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0025)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 156.17 kg\n  Factor of Safety: 0.26\n  Max Deflection: 3.25e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 156.16623516071746,
      "fos_buckling": 0.26168990658105823,
      "fos_yielding": 0.9083568925401585,
      "deflection": 32544235719239.664,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2828": {
      "node_id": "node_2828",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 177.23 kg\n  Factor of Safety: 0.49\n  Max Deflection: 1.04e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.23143119176152,
      "fos_buckling": 0.4937204638081375,
      "fos_yielding": 1.1253073712763755,
      "deflection": 10431087547984.021,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.145)"
      },
      "parent_node_id": "node_2827",
      "improvement_over_parent": null
    },
    "node_2829": {
      "node_id": "node_2829",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 213.14 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.01e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.14152806509716,
      "fos_buckling": 0.8654164916795238,
      "fos_yielding": 1.6623028996035625,
      "deflection": 0.006007178010503277,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005043)"
      },
      "parent_node_id": "node_2828",
      "improvement_over_parent": null
    },
    "node_2830": {
      "node_id": "node_2830",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 256.36 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.3641525466958,
      "fos_buckling": 1.006915586833938,
      "fos_yielding": 1.9962523558573746,
      "deflection": 0.005010268248578881,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.222)"
      },
      "parent_node_id": "node_2829",
      "improvement_over_parent": null
    },
    "node_2831": {
      "node_id": "node_2831",
      "content": "MODIFICATION: Increase 7 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0080)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 270.41 kg\n  Factor of Safety: 1.01\n  Max Deflection: 4.92e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 270.4109552061537,
      "fos_buckling": 1.0059469152298075,
      "fos_yielding": 1.9698333673681407,
      "deflection": 0.004922717519024072,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.527)"
      },
      "parent_node_id": "node_2830",
      "improvement_over_parent": null
    },
    "node_2832": {
      "node_id": "node_2832",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0080)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 296.31 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 296.30839234854346,
      "fos_buckling": 1.4345959311255503,
      "fos_yielding": 1.9830403201033884,
      "deflection": 0.004076946777311996,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2831",
      "improvement_over_parent": null
    },
    "node_2833": {
      "node_id": "node_2833",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2832",
      "improvement_over_parent": null
    },
    "node_2834": {
      "node_id": "node_2834",
      "content": "INITIAL DESIGN (Trace 409)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0022)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0009)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0020)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0024)]\n\nPerformance:\n  Mass: 87.95 kg\n  Factor of Safety: 0.28\n  Max Deflection: 7.42e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 87.95134981587384,
      "fos_buckling": 0.28181695087142833,
      "fos_yielding": 0.6636531010842038,
      "deflection": 74191192052211.02,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2835": {
      "node_id": "node_2835",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0011)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0029)]\n\nPerformance:\n  Mass: 104.42 kg\n  Factor of Safety: 0.26\n  Max Deflection: 2.09e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 104.42177685199664,
      "fos_buckling": 0.2617240050543241,
      "fos_yielding": 0.5626536856381877,
      "deflection": 20925391891790.234,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.195)"
      },
      "parent_node_id": "node_2834",
      "improvement_over_parent": null
    },
    "node_2836": {
      "node_id": "node_2836",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 136.56 kg\n  Factor of Safety: 0.51\n  Max Deflection: 1.55e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 136.5641352421497,
      "fos_buckling": 0.5105090262911445,
      "fos_yielding": 1.1253073712763755,
      "deflection": 15524120565683.547,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.325)"
      },
      "parent_node_id": "node_2835",
      "improvement_over_parent": null
    },
    "node_2837": {
      "node_id": "node_2837",
      "content": "MODIFICATION: Increase 4 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 138.20 kg\n  Factor of Safety: 0.51\n  Max Deflection: 1.55e+13 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 138.20421970468405,
      "fos_buckling": 0.5105090262911445,
      "fos_yielding": 1.1253073712763755,
      "deflection": 15524120565683.547,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.608)"
      },
      "parent_node_id": "node_2836",
      "improvement_over_parent": null
    },
    "node_2838": {
      "node_id": "node_2838",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 173.47 kg\n  Factor of Safety: 0.99\n  Max Deflection: 7.85e+12 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.4660753069432,
      "fos_buckling": 0.9929557195641102,
      "fos_yielding": 1.8153811184773034,
      "deflection": 7845518393572.5625,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.274)"
      },
      "parent_node_id": "node_2837",
      "improvement_over_parent": null
    },
    "node_2839": {
      "node_id": "node_2839",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 217.08 kg\n  Factor of Safety: 0.46\n  Max Deflection: 1.68e+13 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.07524876777293,
      "fos_buckling": 0.4647327164882809,
      "fos_yielding": 1.198200074312941,
      "deflection": 16837809678740.293,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.276)"
      },
      "parent_node_id": "node_2838",
      "improvement_over_parent": null
    },
    "node_2840": {
      "node_id": "node_2840",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 260.27 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.27330670522514,
      "fos_buckling": 1.0071890115631725,
      "fos_yielding": 1.9982127680992066,
      "deflection": 0.0050077139252452055,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2839",
      "improvement_over_parent": null
    },
    "node_2841": {
      "node_id": "node_2841",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.18584333684214,
      "fos_buckling": 1.5226113465720372,
      "fos_yielding": 2.0119995272232893,
      "deflection": 0.004041251472780624,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2840",
      "improvement_over_parent": null
    },
    "node_2842": {
      "node_id": "node_2842",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2841",
      "improvement_over_parent": null
    },
    "node_2843": {
      "node_id": "node_2843",
      "content": "INITIAL DESIGN (Trace 410)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0013)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 151.63 kg\n  Factor of Safety: 0.63\n  Max Deflection: 8.68e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.62862745447416,
      "fos_buckling": 0.6257826170825014,
      "fos_yielding": 1.1479472679905154,
      "deflection": 0.008681718140542753,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2844": {
      "node_id": "node_2844",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 177.81 kg\n  Factor of Safety: 0.72\n  Max Deflection: 7.42e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.80919017915915,
      "fos_buckling": 0.7203848868932957,
      "fos_yielding": 1.345213969925385,
      "deflection": 0.007415976233882638,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.183)"
      },
      "parent_node_id": "node_2843",
      "improvement_over_parent": null
    },
    "node_2845": {
      "node_id": "node_2845",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 204.54 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.46e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.54241439587219,
      "fos_buckling": 0.8129555321174462,
      "fos_yielding": 1.5463571292684881,
      "deflection": 0.006457880777665494,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.161)"
      },
      "parent_node_id": "node_2844",
      "improvement_over_parent": null
    },
    "node_2846": {
      "node_id": "node_2846",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 264.77 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.77299465636986,
      "fos_buckling": 1.0067180827634916,
      "fos_yielding": 1.9984660970025379,
      "deflection": 0.005008304015052899,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.323)"
      },
      "parent_node_id": "node_2845",
      "improvement_over_parent": null
    },
    "node_2847": {
      "node_id": "node_2847",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 290.67 kg\n  Factor of Safety: 1.17\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.67043179875964,
      "fos_buckling": 1.1651269626181318,
      "fos_yielding": 1.8995977131983741,
      "deflection": 0.0041190589456465265,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2846",
      "improvement_over_parent": null
    },
    "node_2848": {
      "node_id": "node_2848",
      "content": "MODIFICATION: Increase 4 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0054)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.47 kg\n  Factor of Safety: 1.15\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.4729115885352,
      "fos_buckling": 1.1544841286388137,
      "fos_yielding": 1.8822458676590408,
      "deflection": 0.004055695719924304,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.631)"
      },
      "parent_node_id": "node_2847",
      "improvement_over_parent": null
    },
    "node_2849": {
      "node_id": "node_2849",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2848",
      "improvement_over_parent": null
    },
    "node_2850": {
      "node_id": "node_2850",
      "content": "INITIAL DESIGN (Trace 411)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 256.98 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.12e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.9827538567754,
      "fos_buckling": 1.0077313177099352,
      "fos_yielding": 2.2657141892111756,
      "deflection": 0.00611925309305073,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2851": {
      "node_id": "node_2851",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 282.88 kg\n  Factor of Safety: 1.04\n  Max Deflection: 6.11e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.88019099916517,
      "fos_buckling": 1.041963721009583,
      "fos_yielding": 2.3133402323894905,
      "deflection": 0.006114563865905389,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2850",
      "improvement_over_parent": null
    },
    "node_2852": {
      "node_id": "node_2852",
      "content": "MODIFICATION: Increase 0 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 288.00 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.0022917750056,
      "fos_buckling": 1.0366600924318385,
      "fos_yielding": 2.2959288957560133,
      "deflection": 0.005879644850069726,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.195)"
      },
      "parent_node_id": "node_2851",
      "improvement_over_parent": null
    },
    "node_2853": {
      "node_id": "node_2853",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.21612180881965,
      "fos_buckling": 1.5228787375766202,
      "fos_yielding": 2.0124438961893722,
      "deflection": 0.004040855834877491,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2852",
      "improvement_over_parent": null
    },
    "node_2854": {
      "node_id": "node_2854",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2853",
      "improvement_over_parent": null
    },
    "node_2855": {
      "node_id": "node_2855",
      "content": "INITIAL DESIGN (Trace 412)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 214.68 kg\n  Factor of Safety: 0.51\n  Max Deflection: 7.21e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.68432681259048,
      "fos_buckling": 0.5134050257519946,
      "fos_yielding": 1.7924630605243745,
      "deflection": 0.007205243669243255,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2856": {
      "node_id": "node_2856",
      "content": "MODIFICATION: Increase 7 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 221.63 kg\n  Factor of Safety: 0.67\n  Max Deflection: 6.31e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.62939935459357,
      "fos_buckling": 0.6729157037313364,
      "fos_yielding": 1.8142113133623847,
      "deflection": 0.006312612498061998,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.366)"
      },
      "parent_node_id": "node_2855",
      "improvement_over_parent": null
    },
    "node_2857": {
      "node_id": "node_2857",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 244.33 kg\n  Factor of Safety: 0.73\n  Max Deflection: 5.73e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.3277795519079,
      "fos_buckling": 0.7344845104821859,
      "fos_yielding": 1.9979694008933044,
      "deflection": 0.005729504578216368,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.112)"
      },
      "parent_node_id": "node_2856",
      "improvement_over_parent": null
    },
    "node_2858": {
      "node_id": "node_2858",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 277.24 kg\n  Factor of Safety: 1.13\n  Max Deflection: 4.40e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 277.2403161835249,
      "fos_buckling": 1.126908099070158,
      "fos_yielding": 1.8406438845666009,
      "deflection": 0.004403279111566407,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2857",
      "improvement_over_parent": null
    },
    "node_2859": {
      "node_id": "node_2859",
      "content": "MODIFICATION: Increase 4 thickness by 60%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 279.73 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.31e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 279.7308259074865,
      "fos_buckling": 1.2181916062715097,
      "fos_yielding": 2.014202545100775,
      "deflection": 0.004313214807704471,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.600)"
      },
      "parent_node_id": "node_2858",
      "improvement_over_parent": null
    },
    "node_2860": {
      "node_id": "node_2860",
      "content": "MODIFICATION: Increase 7 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.12822536070746,
      "fos_buckling": 1.5223001196024266,
      "fos_yielding": 2.0114755976851946,
      "deflection": 0.004042095576373443,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.493)"
      },
      "parent_node_id": "node_2859",
      "improvement_over_parent": null
    },
    "node_2861": {
      "node_id": "node_2861",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2860",
      "improvement_over_parent": null
    },
    "node_2862": {
      "node_id": "node_2862",
      "content": "INITIAL DESIGN (Trace 413)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0018)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 151.52 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.68e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.52066264813385,
      "fos_buckling": 0.84763725641647,
      "fos_yielding": 1.093840157602794,
      "deflection": 0.007677133321478569,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2863": {
      "node_id": "node_2863",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 194.69 kg\n  Factor of Safety: 1.06\n  Max Deflection: 5.99e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.69288567223515,
      "fos_buckling": 1.0592142996276221,
      "fos_yielding": 1.4035504472364009,
      "deflection": 0.005990288183877062,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.302)"
      },
      "parent_node_id": "node_2862",
      "improvement_over_parent": null
    },
    "node_2864": {
      "node_id": "node_2864",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 248.22 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.71e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.22032161275973,
      "fos_buckling": 1.3034076815058124,
      "fos_yielding": 1.7862728964317676,
      "deflection": 0.004713633068416316,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.297)"
      },
      "parent_node_id": "node_2863",
      "improvement_over_parent": null
    },
    "node_2865": {
      "node_id": "node_2865",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 283.78 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.78278091881475,
      "fos_buckling": 1.4546459838362904,
      "fos_yielding": 2.039736037765481,
      "deflection": 0.004131741730255449,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.157)"
      },
      "parent_node_id": "node_2864",
      "improvement_over_parent": null
    },
    "node_2866": {
      "node_id": "node_2866",
      "content": "MODIFICATION: Increase 9 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.08 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0834641212895,
      "fos_buckling": 1.5222820175812515,
      "fos_yielding": 2.011539921380828,
      "deflection": 0.004042583838021338,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.471)"
      },
      "parent_node_id": "node_2865",
      "improvement_over_parent": null
    },
    "node_2867": {
      "node_id": "node_2867",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2866",
      "improvement_over_parent": null
    },
    "node_2868": {
      "node_id": "node_2868",
      "content": "INITIAL DESIGN (Trace 414)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 187.42 kg\n  Factor of Safety: 0.64\n  Max Deflection: 9.00e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 187.42196311225914,
      "fos_buckling": 0.635445165027109,
      "fos_yielding": 1.6207086747295192,
      "deflection": 0.008995955087001496,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2869": {
      "node_id": "node_2869",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n\nPerformance:\n  Mass: 191.05 kg\n  Factor of Safety: 0.97\n  Max Deflection: 6.15e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 191.05053462171864,
      "fos_buckling": 0.9675286711517337,
      "fos_yielding": 1.424199843588965,
      "deflection": 0.006145948505010244,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002235)"
      },
      "parent_node_id": "node_2868",
      "improvement_over_parent": null
    },
    "node_2870": {
      "node_id": "node_2870",
      "content": "MODIFICATION: Increase 7 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n\nPerformance:\n  Mass: 196.97 kg\n  Factor of Safety: 1.00\n  Max Deflection: 6.05e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.97209490537168,
      "fos_buckling": 1.001765172566752,
      "fos_yielding": 1.4246919030659377,
      "deflection": 0.006046645225114253,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.280)"
      },
      "parent_node_id": "node_2869",
      "improvement_over_parent": null
    },
    "node_2871": {
      "node_id": "node_2871",
      "content": "MODIFICATION: Increase 9 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n\nPerformance:\n  Mass: 210.52 kg\n  Factor of Safety: 1.00\n  Max Deflection: 5.68e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.51807616404872,
      "fos_buckling": 1.0047489347701932,
      "fos_yielding": 1.4495261292952495,
      "deflection": 0.005684689698165023,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.479)"
      },
      "parent_node_id": "node_2870",
      "improvement_over_parent": null
    },
    "node_2872": {
      "node_id": "node_2872",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0053)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0071)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 237.39 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.05e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.39455079862694,
      "fos_buckling": 1.1196525528465608,
      "fos_yielding": 1.6346579999288777,
      "deflection": 0.005046795832454295,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_2871",
      "improvement_over_parent": null
    },
    "node_2873": {
      "node_id": "node_2873",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0069)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0093)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 301.62 kg\n  Factor of Safety: 1.38\n  Max Deflection: 3.98e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 301.6178629846415,
      "fos_buckling": 1.3818635555472112,
      "fos_yielding": 2.077271333697306,
      "deflection": 0.003982671188448556,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.300)"
      },
      "parent_node_id": "node_2872",
      "improvement_over_parent": null
    },
    "node_2874": {
      "node_id": "node_2874",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2873",
      "improvement_over_parent": null
    },
    "node_2875": {
      "node_id": "node_2875",
      "content": "INITIAL DESIGN (Trace 415)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 141.11 kg\n  Factor of Safety: 0.47\n  Max Deflection: 3.43e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.10865490063787,
      "fos_buckling": 0.46912139391644375,
      "fos_yielding": 1.5421375027931996,
      "deflection": 34318846231178.875,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2876": {
      "node_id": "node_2876",
      "content": "MODIFICATION: Increase 4 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 141.69 kg\n  Factor of Safety: 0.47\n  Max Deflection: 3.43e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.6863233608865,
      "fos_buckling": 0.46912139391644375,
      "fos_yielding": 1.5421375027931996,
      "deflection": 34318846231178.875,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.183)"
      },
      "parent_node_id": "node_2875",
      "improvement_over_parent": null
    },
    "node_2877": {
      "node_id": "node_2877",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 180.24 kg\n  Factor of Safety: 0.07\n  Max Deflection: 7.06e+14 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.23872434783954,
      "fos_buckling": 0.0712431837604633,
      "fos_yielding": 0.09678731732691195,
      "deflection": 705587070175615.4,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.294)"
      },
      "parent_node_id": "node_2876",
      "improvement_over_parent": null
    },
    "node_2878": {
      "node_id": "node_2878",
      "content": "MODIFICATION: Increase 4 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 181.35 kg\n  Factor of Safety: 0.07\n  Max Deflection: 7.06e+14 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.3489093164348,
      "fos_buckling": 0.0712431837604633,
      "fos_yielding": 0.09678731732691195,
      "deflection": 705587070175615.4,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.242)"
      },
      "parent_node_id": "node_2877",
      "improvement_over_parent": null
    },
    "node_2879": {
      "node_id": "node_2879",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 219.75 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.82e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.75199679662745,
      "fos_buckling": 0.8919180118350613,
      "fos_yielding": 1.9578702413803144,
      "deflection": 0.006818946442565072,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005324)"
      },
      "parent_node_id": "node_2878",
      "improvement_over_parent": null
    },
    "node_2880": {
      "node_id": "node_2880",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n\nPerformance:\n  Mass: 224.24 kg\n  Factor of Safety: 0.89\n  Max Deflection: 5.80e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.24403103516227,
      "fos_buckling": 0.891367545281223,
      "fos_yielding": 1.7232083108485483,
      "deflection": 0.00579948465279352,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002810)"
      },
      "parent_node_id": "node_2879",
      "improvement_over_parent": null
    },
    "node_2881": {
      "node_id": "node_2881",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n\nPerformance:\n  Mass: 252.60 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.68e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 252.5980503538051,
      "fos_buckling": 1.3477340668084725,
      "fos_yielding": 1.735171404403355,
      "deflection": 0.0046795953221781105,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004575)"
      },
      "parent_node_id": "node_2880",
      "improvement_over_parent": null
    },
    "node_2882": {
      "node_id": "node_2882",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.07 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0704863295829,
      "fos_buckling": 1.5222119334839745,
      "fos_yielding": 2.0113538797907453,
      "deflection": 0.004042828032311281,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.176)"
      },
      "parent_node_id": "node_2881",
      "improvement_over_parent": null
    },
    "node_2883": {
      "node_id": "node_2883",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2882",
      "improvement_over_parent": null
    },
    "node_2884": {
      "node_id": "node_2884",
      "content": "INITIAL DESIGN (Trace 416)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2885": {
      "node_id": "node_2885",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n\nPerformance:\n  Mass: 178.14 kg\n  Factor of Safety: 0.76\n  Max Deflection: 7.31e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.14473506588448,
      "fos_buckling": 0.7605443865176491,
      "fos_yielding": 1.4026260930472598,
      "deflection": 0.007310559750766918,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003483)"
      },
      "parent_node_id": "node_2884",
      "improvement_over_parent": null
    },
    "node_2886": {
      "node_id": "node_2886",
      "content": "MODIFICATION: Increase 1 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n\nPerformance:\n  Mass: 185.91 kg\n  Factor of Safety: 0.76\n  Max Deflection: 6.98e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.9142494238732,
      "fos_buckling": 0.7601374332551064,
      "fos_yielding": 1.4300997041596082,
      "deflection": 0.0069783470977431645,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.479)"
      },
      "parent_node_id": "node_2885",
      "improvement_over_parent": null
    },
    "node_2887": {
      "node_id": "node_2887",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n\nPerformance:\n  Mass: 236.23 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.51e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.2254074004012,
      "fos_buckling": 0.9307455552063896,
      "fos_yielding": 1.8148913610927697,
      "deflection": 0.005509293532890729,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.294)"
      },
      "parent_node_id": "node_2886",
      "improvement_over_parent": null
    },
    "node_2888": {
      "node_id": "node_2888",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 266.08 kg\n  Factor of Safety: 1.41\n  Max Deflection: 4.45e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 266.0780028933598,
      "fos_buckling": 1.407499457004111,
      "fos_yielding": 1.8274609301217517,
      "deflection": 0.004445953599885984,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004838)"
      },
      "parent_node_id": "node_2887",
      "improvement_over_parent": null
    },
    "node_2889": {
      "node_id": "node_2889",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1945025171668,
      "fos_buckling": 1.523153328857158,
      "fos_yielding": 2.012468162935126,
      "deflection": 0.004041109585302836,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.112)"
      },
      "parent_node_id": "node_2888",
      "improvement_over_parent": null
    },
    "node_2890": {
      "node_id": "node_2890",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2889",
      "improvement_over_parent": null
    },
    "node_2891": {
      "node_id": "node_2891",
      "content": "INITIAL DESIGN (Trace 417)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n\nPerformance:\n  Mass: 160.45 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.25e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.44538271811717,
      "fos_buckling": 0.33930952617775495,
      "fos_yielding": 1.146011065898357,
      "deflection": 0.012507002765330538,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2892": {
      "node_id": "node_2892",
      "content": "MODIFICATION: Increase 7 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n\nPerformance:\n  Mass: 166.66 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.23e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.65934891432317,
      "fos_buckling": 0.3391641237481271,
      "fos_yielding": 1.1458585481617645,
      "deflection": 0.012290396491753206,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.263)"
      },
      "parent_node_id": "node_2891",
      "improvement_over_parent": null
    },
    "node_2893": {
      "node_id": "node_2893",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 201.48 kg\n  Factor of Safety: 0.40\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.48345447360035,
      "fos_buckling": 0.40099967132267883,
      "fos_yielding": 1.3824290785883695,
      "deflection": 0.010171295486367566,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.225)"
      },
      "parent_node_id": "node_2892",
      "improvement_over_parent": null
    },
    "node_2894": {
      "node_id": "node_2894",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 229.74 kg\n  Factor of Safety: 0.45\n  Max Deflection: 8.92e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.74194424214545,
      "fos_buckling": 0.4488940949896223,
      "fos_yielding": 1.5736063402455092,
      "deflection": 0.008923348306985433,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.153)"
      },
      "parent_node_id": "node_2893",
      "improvement_over_parent": null
    },
    "node_2895": {
      "node_id": "node_2895",
      "content": "MODIFICATION: Increase 0 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 235.75 kg\n  Factor of Safety: 0.45\n  Max Deflection: 8.79e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.74876389825218,
      "fos_buckling": 0.44870898621469163,
      "fos_yielding": 1.573404307868681,
      "deflection": 0.008793362809840732,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.236)"
      },
      "parent_node_id": "node_2894",
      "improvement_over_parent": null
    },
    "node_2896": {
      "node_id": "node_2896",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 280.33 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 280.3306950661981,
      "fos_buckling": 1.4377310606736797,
      "fos_yielding": 2.048027481907178,
      "deflection": 0.004154905823515483,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_2895",
      "improvement_over_parent": null
    },
    "node_2897": {
      "node_id": "node_2897",
      "content": "MODIFICATION: Increase 9 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 289.12 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.12281998936,
      "fos_buckling": 1.493293003701713,
      "fos_yielding": 2.0237349728907774,
      "deflection": 0.004079463375892427,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.435)"
      },
      "parent_node_id": "node_2896",
      "improvement_over_parent": null
    },
    "node_2898": {
      "node_id": "node_2898",
      "content": "MODIFICATION: Increase 3 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.144042076919,
      "fos_buckling": 1.5227597352165134,
      "fos_yielding": 2.011849193443242,
      "deflection": 0.004041733630260646,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.217)"
      },
      "parent_node_id": "node_2897",
      "improvement_over_parent": null
    },
    "node_2899": {
      "node_id": "node_2899",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2898",
      "improvement_over_parent": null
    },
    "node_2900": {
      "node_id": "node_2900",
      "content": "INITIAL DESIGN (Trace 418)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 229.17 kg\n  Factor of Safety: 0.86\n  Max Deflection: 7.34e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.16896042262502,
      "fos_buckling": 0.8562818903649945,
      "fos_yielding": 1.8349971996167231,
      "deflection": 0.00733820137367822,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2901": {
      "node_id": "node_2901",
      "content": "MODIFICATION: Increase 4 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 230.33 kg\n  Factor of Safety: 0.86\n  Max Deflection: 7.34e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.33129951805608,
      "fos_buckling": 0.8606321212440626,
      "fos_yielding": 1.8391163899799416,
      "deflection": 0.007337625968646285,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.279)"
      },
      "parent_node_id": "node_2900",
      "improvement_over_parent": null
    },
    "node_2902": {
      "node_id": "node_2902",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 288.23 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.87e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.22989331011615,
      "fos_buckling": 1.037276498790483,
      "fos_yielding": 2.2976357696318743,
      "deflection": 0.005874931008143676,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.276)"
      },
      "parent_node_id": "node_2901",
      "improvement_over_parent": null
    },
    "node_2903": {
      "node_id": "node_2903",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.44 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.44372334393023,
      "fos_buckling": 1.5237566649251657,
      "fos_yielding": 2.0139788007158232,
      "deflection": 0.004037839556924887,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2902",
      "improvement_over_parent": null
    },
    "node_2904": {
      "node_id": "node_2904",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2903",
      "improvement_over_parent": null
    },
    "node_2905": {
      "node_id": "node_2905",
      "content": "INITIAL DESIGN (Trace 419)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 181.36 kg\n  Factor of Safety: 0.45\n  Max Deflection: 9.88e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.35576037105258,
      "fos_buckling": 0.4499498218336302,
      "fos_yielding": 1.3836610760408705,
      "deflection": 0.009878948640161382,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2906": {
      "node_id": "node_2906",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 212.92 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.43e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.91679407393514,
      "fos_buckling": 0.515728391095931,
      "fos_yielding": 1.6216827665460491,
      "deflection": 0.008429951425350276,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.188)"
      },
      "parent_node_id": "node_2905",
      "improvement_over_parent": null
    },
    "node_2907": {
      "node_id": "node_2907",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n\nPerformance:\n  Mass: 249.69 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.73e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.68972144496976,
      "fos_buckling": 1.3348334020091064,
      "fos_yielding": 1.7154128472495365,
      "deflection": 0.0047332987348612755,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005174)"
      },
      "parent_node_id": "node_2906",
      "improvement_over_parent": null
    },
    "node_2908": {
      "node_id": "node_2908",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.33 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3329566462264,
      "fos_buckling": 1.5233858587140323,
      "fos_yielding": 2.013267004260449,
      "deflection": 0.004039268236528451,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.192)"
      },
      "parent_node_id": "node_2907",
      "improvement_over_parent": null
    },
    "node_2909": {
      "node_id": "node_2909",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2908",
      "improvement_over_parent": null
    },
    "node_2910": {
      "node_id": "node_2910",
      "content": "INITIAL DESIGN (Trace 420)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0022)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0012)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 129.09 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.35e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 129.0855132641334,
      "fos_buckling": 0.4296887967146782,
      "fos_yielding": 1.0895579069992283,
      "deflection": 0.013456790154620504,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2911": {
      "node_id": "node_2911",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0022)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0012)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n\nPerformance:\n  Mass: 131.52 kg\n  Factor of Safety: 0.60\n  Max Deflection: 9.10e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 131.52403912420317,
      "fos_buckling": 0.5983010983292834,
      "fos_yielding": 0.9259076346649528,
      "deflection": 0.009104875009978291,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001472)"
      },
      "parent_node_id": "node_2910",
      "improvement_over_parent": null
    },
    "node_2912": {
      "node_id": "node_2912",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0013)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0024)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n\nPerformance:\n  Mass: 151.03 kg\n  Factor of Safety: 0.68\n  Max Deflection: 7.94e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.0339154876051,
      "fos_buckling": 0.6824120655474877,
      "fos_yielding": 1.0642648583882974,
      "deflection": 0.007936455533209201,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.155)"
      },
      "parent_node_id": "node_2911",
      "improvement_over_parent": null
    },
    "node_2913": {
      "node_id": "node_2913",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n\nPerformance:\n  Mass: 180.81 kg\n  Factor of Safety: 0.81\n  Max Deflection: 6.64e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.80816102789424,
      "fos_buckling": 0.8084621756903033,
      "fos_yielding": 1.2760265099900394,
      "deflection": 0.006639313617947096,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.208)"
      },
      "parent_node_id": "node_2912",
      "improvement_over_parent": null
    },
    "node_2914": {
      "node_id": "node_2914",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 233.15 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.16e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.15419803405123,
      "fos_buckling": 1.0232891413177942,
      "fos_yielding": 1.65033536682826,
      "deflection": 0.005161925780317617,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.311)"
      },
      "parent_node_id": "node_2913",
      "improvement_over_parent": null
    },
    "node_2915": {
      "node_id": "node_2915",
      "content": "MODIFICATION: Increase 7 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0057)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 240.68 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.08e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.6785743966774,
      "fos_buckling": 1.0051729733917956,
      "fos_yielding": 1.6211180601722226,
      "deflection": 0.005080261972784188,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.305)"
      },
      "parent_node_id": "node_2914",
      "improvement_over_parent": null
    },
    "node_2916": {
      "node_id": "node_2916",
      "content": "MODIFICATION: Increase 4 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0057)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 242.49 kg\n  Factor of Safety: 1.16\n  Max Deflection: 4.99e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.4933189341049,
      "fos_buckling": 1.1555048491170046,
      "fos_yielding": 1.6710369975340467,
      "deflection": 0.004989151547278431,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.486)"
      },
      "parent_node_id": "node_2915",
      "improvement_over_parent": null
    },
    "node_2917": {
      "node_id": "node_2917",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0070)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 292.96 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.9565578437716,
      "fos_buckling": 1.3628300923199623,
      "fos_yielding": 2.0170993776837007,
      "deflection": 0.004139064319875751,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.229)"
      },
      "parent_node_id": "node_2916",
      "improvement_over_parent": null
    },
    "node_2918": {
      "node_id": "node_2918",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2917",
      "improvement_over_parent": null
    },
    "node_2919": {
      "node_id": "node_2919",
      "content": "INITIAL DESIGN (Trace 421)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 171.18 kg\n  Factor of Safety: 0.23\n  Max Deflection: 3.22e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.18408150440257,
      "fos_buckling": 0.2324084421123359,
      "fos_yielding": 0.7020304314090497,
      "deflection": 32238500698643.42,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2920": {
      "node_id": "node_2920",
      "content": "MODIFICATION: Increase 5 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 172.56 kg\n  Factor of Safety: 0.14\n  Max Deflection: 4.31e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.55899339111795,
      "fos_buckling": 0.13890932154389887,
      "fos_yielding": 0.4838943878501439,
      "deflection": 43083682234679.32,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.393)"
      },
      "parent_node_id": "node_2919",
      "improvement_over_parent": null
    },
    "node_2921": {
      "node_id": "node_2921",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 208.29 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.70e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 208.29081444650058,
      "fos_buckling": 0.8621479398720746,
      "fos_yielding": 2.288809712542951,
      "deflection": 0.006704339964741275,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005016)"
      },
      "parent_node_id": "node_2920",
      "improvement_over_parent": null
    },
    "node_2922": {
      "node_id": "node_2922",
      "content": "MODIFICATION: Increase 0 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 216.71 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.25e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.70775322533717,
      "fos_buckling": 0.8616491212257239,
      "fos_yielding": 2.288809712542951,
      "deflection": 0.006252456855483805,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.361)"
      },
      "parent_node_id": "node_2921",
      "improvement_over_parent": null
    },
    "node_2923": {
      "node_id": "node_2923",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 249.62 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.97e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.62028985695417,
      "fos_buckling": 1.0735175464384725,
      "fos_yielding": 2.288809712542951,
      "deflection": 0.004973226997398567,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2922",
      "improvement_over_parent": null
    },
    "node_2924": {
      "node_id": "node_2924",
      "content": "MODIFICATION: Increase 7 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0077)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 258.73 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.71e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.72721649746404,
      "fos_buckling": 1.2444159735861036,
      "fos_yielding": 2.288809712542951,
      "deflection": 0.0047106740516072495,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.230)"
      },
      "parent_node_id": "node_2923",
      "improvement_over_parent": null
    },
    "node_2925": {
      "node_id": "node_2925",
      "content": "MODIFICATION: Increase 3 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0077)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 263.92 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.71e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.92009337386395,
      "fos_buckling": 1.2439732087102648,
      "fos_yielding": 2.2880711023039924,
      "deflection": 0.004712311453483177,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.297)"
      },
      "parent_node_id": "node_2924",
      "improvement_over_parent": null
    },
    "node_2926": {
      "node_id": "node_2926",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0077)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 294.90 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.89863942294033,
      "fos_buckling": 1.3615177205000506,
      "fos_yielding": 2.034004934528362,
      "deflection": 0.004049410612353533,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2925",
      "improvement_over_parent": null
    },
    "node_2927": {
      "node_id": "node_2927",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2926",
      "improvement_over_parent": null
    },
    "node_2928": {
      "node_id": "node_2928",
      "content": "INITIAL DESIGN (Trace 422)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 128.53 kg\n  Factor of Safety: 0.00\n  Max Deflection: 5.98e+15 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 128.53359814010733,
      "fos_buckling": 0.0019822945923437282,
      "fos_yielding": 0.0068570390799356975,
      "deflection": 5982271154372338.0,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2929": {
      "node_id": "node_2929",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n\nPerformance:\n  Mass: 142.45 kg\n  Factor of Safety: 0.06\n  Max Deflection: 1.39e+14 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 142.44564267019103,
      "fos_buckling": 0.06299618221617005,
      "fos_yielding": 0.14066342140954693,
      "deflection": 139169430221892.45,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002229)"
      },
      "parent_node_id": "node_2928",
      "improvement_over_parent": null
    },
    "node_2930": {
      "node_id": "node_2930",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n\nPerformance:\n  Mass: 165.88 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.8822631959455,
      "fos_buckling": 0.44327403258652615,
      "fos_yielding": 1.3594797630806275,
      "deflection": 0.010232105818579895,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003729)"
      },
      "parent_node_id": "node_2929",
      "improvement_over_parent": null
    },
    "node_2931": {
      "node_id": "node_2931",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 209.18 kg\n  Factor of Safety: 0.54\n  Max Deflection: 8.14e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.18429151119878,
      "fos_buckling": 0.5392105216219597,
      "fos_yielding": 1.7086337754673235,
      "deflection": 0.008140083875156572,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.282)"
      },
      "parent_node_id": "node_2930",
      "improvement_over_parent": null
    },
    "node_2932": {
      "node_id": "node_2932",
      "content": "MODIFICATION: Increase 3 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 214.20 kg\n  Factor of Safety: 0.54\n  Max Deflection: 8.11e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.20467178918855,
      "fos_buckling": 0.5390244242618173,
      "fos_yielding": 1.708320114273247,
      "deflection": 0.008105416242675294,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.323)"
      },
      "parent_node_id": "node_2931",
      "improvement_over_parent": null
    },
    "node_2933": {
      "node_id": "node_2933",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 238.65 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.29e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.65205523926033,
      "fos_buckling": 0.5885532619783919,
      "fos_yielding": 1.9001072433111066,
      "deflection": 0.007287019495254039,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.125)"
      },
      "parent_node_id": "node_2932",
      "improvement_over_parent": null
    },
    "node_2934": {
      "node_id": "node_2934",
      "content": "MODIFICATION: Increase 8 thickness by 62%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 249.87 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.20e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.86936550875603,
      "fos_buckling": 0.588100476882075,
      "fos_yielding": 1.8993292390577337,
      "deflection": 0.007198795113113489,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.623)"
      },
      "parent_node_id": "node_2933",
      "improvement_over_parent": null
    },
    "node_2935": {
      "node_id": "node_2935",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.07 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.06742344620824,
      "fos_buckling": 1.522136982242545,
      "fos_yielding": 2.011140951559934,
      "deflection": 0.004042792536564951,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_2934",
      "improvement_over_parent": null
    },
    "node_2936": {
      "node_id": "node_2936",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2935",
      "improvement_over_parent": null
    },
    "node_2937": {
      "node_id": "node_2937",
      "content": "INITIAL DESIGN (Trace 423)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 197.45 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.48e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.4462445714326,
      "fos_buckling": 0.8573122503782347,
      "fos_yielding": 1.7468615202005133,
      "deflection": 0.00648324602996891,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2938": {
      "node_id": "node_2938",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 224.69 kg\n  Factor of Safety: 0.96\n  Max Deflection: 5.71e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.69126253059727,
      "fos_buckling": 0.9558874345112982,
      "fos_yielding": 1.9867856098243388,
      "deflection": 0.005707289789882932,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.149)"
      },
      "parent_node_id": "node_2937",
      "improvement_over_parent": null
    },
    "node_2939": {
      "node_id": "node_2939",
      "content": "MODIFICATION: Increase 7 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 233.47 kg\n  Factor of Safety: 0.96\n  Max Deflection: 5.58e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.4676254432279,
      "fos_buckling": 0.95531148864278,
      "fos_yielding": 1.9867856098243388,
      "deflection": 0.005575879299623297,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.479)"
      },
      "parent_node_id": "node_2938",
      "improvement_over_parent": null
    },
    "node_2940": {
      "node_id": "node_2940",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n\nPerformance:\n  Mass: 254.66 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.64e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.65951664197883,
      "fos_buckling": 1.3569246394628196,
      "fos_yielding": 1.7490535316298133,
      "deflection": 0.004642428163198488,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004173)"
      },
      "parent_node_id": "node_2939",
      "improvement_over_parent": null
    },
    "node_2941": {
      "node_id": "node_2941",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.14 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1403650713173,
      "fos_buckling": 1.5225421759916802,
      "fos_yielding": 2.011606309511768,
      "deflection": 0.004042016542721299,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.166)"
      },
      "parent_node_id": "node_2940",
      "improvement_over_parent": null
    },
    "node_2942": {
      "node_id": "node_2942",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2941",
      "improvement_over_parent": null
    },
    "node_2943": {
      "node_id": "node_2943",
      "content": "INITIAL DESIGN (Trace 424)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 230.98 kg\n  Factor of Safety: 0.78\n  Max Deflection: 6.85e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.9782560448875,
      "fos_buckling": 0.7849905104533763,
      "fos_yielding": 2.270067190638536,
      "deflection": 0.0068548176821058284,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2944": {
      "node_id": "node_2944",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 236.19 kg\n  Factor of Safety: 0.78\n  Max Deflection: 5.77e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.1920860787016,
      "fos_buckling": 0.7844285875922021,
      "fos_yielding": 1.9812599699465185,
      "deflection": 0.005774519214201728,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2943",
      "improvement_over_parent": null
    },
    "node_2945": {
      "node_id": "node_2945",
      "content": "MODIFICATION: Increase 3 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 239.56 kg\n  Factor of Safety: 0.78\n  Max Deflection: 5.73e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.55700806173206,
      "fos_buckling": 0.7842474312539315,
      "fos_yielding": 1.9708889812753367,
      "deflection": 0.00573277249124219,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.176)"
      },
      "parent_node_id": "node_2944",
      "improvement_over_parent": null
    },
    "node_2946": {
      "node_id": "node_2946",
      "content": "MODIFICATION: Increase 7 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0072)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 249.83 kg\n  Factor of Safety: 0.78\n  Max Deflection: 5.65e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.82658570708819,
      "fos_buckling": 0.7836950679507408,
      "fos_yielding": 1.9498891349952656,
      "deflection": 0.005650003529511276,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.379)"
      },
      "parent_node_id": "node_2945",
      "improvement_over_parent": null
    },
    "node_2947": {
      "node_id": "node_2947",
      "content": "MODIFICATION: Increase 9 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0072)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0043)]\n\nPerformance:\n  Mass: 251.22 kg\n  Factor of Safety: 0.78\n  Max Deflection: 5.64e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.22371564341827,
      "fos_buckling": 0.783544909486494,
      "fos_yielding": 1.9466464455159638,
      "deflection": 0.0056368901724774415,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.304)"
      },
      "parent_node_id": "node_2946",
      "improvement_over_parent": null
    },
    "node_2948": {
      "node_id": "node_2948",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0072)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0043)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 284.14 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.31e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 284.1362522750353,
      "fos_buckling": 1.2829326709921647,
      "fos_yielding": 1.95862801206162,
      "deflection": 0.004309305358391401,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_2947",
      "improvement_over_parent": null
    },
    "node_2949": {
      "node_id": "node_2949",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2948",
      "improvement_over_parent": null
    },
    "node_2950": {
      "node_id": "node_2950",
      "content": "INITIAL DESIGN (Trace 425)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 143.23 kg\n  Factor of Safety: 0.25\n  Max Deflection: 1.48e+14 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 143.22859341320606,
      "fos_buckling": 0.2518627898059585,
      "fos_yielding": 0.41494091669412436,
      "deflection": 148214681500892.3,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2951": {
      "node_id": "node_2951",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n\nPerformance:\n  Mass: 146.86 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.29e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 146.85869148684606,
      "fos_buckling": 0.3856445676966414,
      "fos_yielding": 1.0982010918904002,
      "deflection": 0.0129176691888075,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002236)"
      },
      "parent_node_id": "node_2950",
      "improvement_over_parent": null
    },
    "node_2952": {
      "node_id": "node_2952",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 177.44 kg\n  Factor of Safety: 0.45\n  Max Deflection: 1.07e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.44478298350435,
      "fos_buckling": 0.45329931800932066,
      "fos_yielding": 1.3248576327069845,
      "deflection": 0.010703265127952657,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_2951",
      "improvement_over_parent": null
    },
    "node_2953": {
      "node_id": "node_2953",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 214.93 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.81e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.9330432009446,
      "fos_buckling": 0.8737462498741614,
      "fos_yielding": 1.6822028932919129,
      "deflection": 0.006806565570276634,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005187)"
      },
      "parent_node_id": "node_2952",
      "improvement_over_parent": null
    },
    "node_2954": {
      "node_id": "node_2954",
      "content": "MODIFICATION: Increase 0 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 224.78 kg\n  Factor of Safety: 0.87\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.7839333509038,
      "fos_buckling": 0.8731550008449616,
      "fos_yielding": 1.681985029022781,
      "deflection": 0.00594092069994677,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.567)"
      },
      "parent_node_id": "node_2953",
      "improvement_over_parent": null
    },
    "node_2955": {
      "node_id": "node_2955",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 267.35 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.35353588383407,
      "fos_buckling": 1.0067111939705022,
      "fos_yielding": 1.9984627267200927,
      "deflection": 0.005008080991830227,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.208)"
      },
      "parent_node_id": "node_2954",
      "improvement_over_parent": null
    },
    "node_2956": {
      "node_id": "node_2956",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.25097302622385,
      "fos_buckling": 1.52304102317205,
      "fos_yielding": 2.0125885591460126,
      "deflection": 0.004040329120064676,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2955",
      "improvement_over_parent": null
    },
    "node_2957": {
      "node_id": "node_2957",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2956",
      "improvement_over_parent": null
    },
    "node_2958": {
      "node_id": "node_2958",
      "content": "INITIAL DESIGN (Trace 426)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2959": {
      "node_id": "node_2959",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n\nPerformance:\n  Mass: 131.74 kg\n  Factor of Safety: 0.44\n  Max Deflection: 1.28e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 131.74335006424093,
      "fos_buckling": 0.44313586285223605,
      "fos_yielding": 0.9954151015919188,
      "deflection": 12788687198385.426,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003076)"
      },
      "parent_node_id": "node_2958",
      "improvement_over_parent": null
    },
    "node_2960": {
      "node_id": "node_2960",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 160.06 kg\n  Factor of Safety: 0.69\n  Max Deflection: 9.23e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 160.0583802767477,
      "fos_buckling": 0.686372360775932,
      "fos_yielding": 0.9954151015919188,
      "deflection": 0.00922787289908881,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003844)"
      },
      "parent_node_id": "node_2959",
      "improvement_over_parent": null
    },
    "node_2961": {
      "node_id": "node_2961",
      "content": "MODIFICATION: Increase 5 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0056)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 172.15 kg\n  Factor of Safety: 0.74\n  Max Deflection: 8.46e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.15316065078545,
      "fos_buckling": 0.7368820724085311,
      "fos_yielding": 0.995415101591919,
      "deflection": 0.008461725306879993,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.479)"
      },
      "parent_node_id": "node_2960",
      "improvement_over_parent": null
    },
    "node_2962": {
      "node_id": "node_2962",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0056)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n\nPerformance:\n  Mass: 175.47 kg\n  Factor of Safety: 0.79\n  Max Deflection: 7.21e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.46541089064235,
      "fos_buckling": 0.7946470428824631,
      "fos_yielding": 0.8863718506563679,
      "deflection": 0.007214392667409195,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002029)"
      },
      "parent_node_id": "node_2961",
      "improvement_over_parent": null
    },
    "node_2963": {
      "node_id": "node_2963",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0074)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 226.24 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.61e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.23702297186213,
      "fos_buckling": 1.008914375624812,
      "fos_yielding": 1.1499831768330873,
      "deflection": 0.005612701217345818,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.314)"
      },
      "parent_node_id": "node_2962",
      "improvement_over_parent": null
    },
    "node_2964": {
      "node_id": "node_2964",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0074)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 253.25 kg\n  Factor of Safety: 1.02\n  Max Deflection: 4.76e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.24569895081612,
      "fos_buckling": 1.0150115662488712,
      "fos_yielding": 1.1569328911131225,
      "deflection": 0.004758939782936986,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004341)"
      },
      "parent_node_id": "node_2963",
      "improvement_over_parent": null
    },
    "node_2965": {
      "node_id": "node_2965",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0091)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 307.84 kg\n  Factor of Safety: 1.22\n  Max Deflection: 3.92e-03 m\n  Status: INFEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 307.83631430985275,
      "fos_buckling": 1.2150447679736298,
      "fos_yielding": 1.4151582602471267,
      "deflection": 0.003923973900308118,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.239)"
      },
      "parent_node_id": "node_2964",
      "improvement_over_parent": null
    },
    "node_2966": {
      "node_id": "node_2966",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2965",
      "improvement_over_parent": null
    },
    "node_2967": {
      "node_id": "node_2967",
      "content": "INITIAL DESIGN (Trace 427)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 203.28 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.25e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.27967823751953,
      "fos_buckling": 0.8717866075286859,
      "fos_yielding": 1.7823706198293248,
      "deflection": 0.006245534217461223,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2968": {
      "node_id": "node_2968",
      "content": "MODIFICATION: Increase 4 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 204.19 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.21e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.1854448443999,
      "fos_buckling": 0.8717866075286859,
      "fos_yielding": 1.7823706198293248,
      "deflection": 0.0062080834470309735,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.212)"
      },
      "parent_node_id": "node_2967",
      "improvement_over_parent": null
    },
    "node_2969": {
      "node_id": "node_2969",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.22 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.2229688583999,
      "fos_buckling": 1.0725271899047666,
      "fos_yielding": 2.2879083317220577,
      "deflection": 0.0048518000279703,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.312)"
      },
      "parent_node_id": "node_2968",
      "improvement_over_parent": null
    },
    "node_2970": {
      "node_id": "node_2970",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2015149074763,
      "fos_buckling": 1.5228029754322332,
      "fos_yielding": 2.0122958148738466,
      "deflection": 0.004041048031764399,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2969",
      "improvement_over_parent": null
    },
    "node_2971": {
      "node_id": "node_2971",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2970",
      "improvement_over_parent": null
    },
    "node_2972": {
      "node_id": "node_2972",
      "content": "INITIAL DESIGN (Trace 428)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 226.76 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.20e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.76345788334777,
      "fos_buckling": 1.2295858511626638,
      "fos_yielding": 1.6929870013388477,
      "deflection": 0.005204795641550645,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2973": {
      "node_id": "node_2973",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 274.92 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.30e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 274.91610093761483,
      "fos_buckling": 1.441160233420325,
      "fos_yielding": 2.048093057955506,
      "deflection": 0.004304533517685194,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.232)"
      },
      "parent_node_id": "node_2972",
      "improvement_over_parent": null
    },
    "node_2974": {
      "node_id": "node_2974",
      "content": "MODIFICATION: Increase 0 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.70 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.70211248152987,
      "fos_buckling": 1.4435826078355405,
      "fos_yielding": 2.0466126439704464,
      "deflection": 0.004145070468660292,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.326)"
      },
      "parent_node_id": "node_2973",
      "improvement_over_parent": null
    },
    "node_2975": {
      "node_id": "node_2975",
      "content": "MODIFICATION: Increase 9 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.32 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.32381564050684,
      "fos_buckling": 1.5232427086010003,
      "fos_yielding": 2.0131062938662465,
      "deflection": 0.004039291097105552,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.572)"
      },
      "parent_node_id": "node_2974",
      "improvement_over_parent": null
    },
    "node_2976": {
      "node_id": "node_2976",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2975",
      "improvement_over_parent": null
    },
    "node_2977": {
      "node_id": "node_2977",
      "content": "INITIAL DESIGN (Trace 429)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 204.11 kg\n  Factor of Safety: 1.06\n  Max Deflection: 5.76e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.1053967832281,
      "fos_buckling": 1.0601295530536634,
      "fos_yielding": 1.4459262216619722,
      "deflection": 0.005764587359740526,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2978": {
      "node_id": "node_2978",
      "content": "MODIFICATION: Increase 2 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 209.37 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.66e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.3650646571367,
      "fos_buckling": 1.0348827798969906,
      "fos_yielding": 1.4467139706238878,
      "deflection": 0.005656071260101727,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.420)"
      },
      "parent_node_id": "node_2977",
      "improvement_over_parent": null
    },
    "node_2979": {
      "node_id": "node_2979",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 232.95 kg\n  Factor of Safety: 1.14\n  Max Deflection: 5.09e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.95065519932376,
      "fos_buckling": 1.1397318242111873,
      "fos_yielding": 1.6087790146167626,
      "deflection": 0.005090185517312927,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.121)"
      },
      "parent_node_id": "node_2978",
      "improvement_over_parent": null
    },
    "node_2980": {
      "node_id": "node_2980",
      "content": "MODIFICATION: Increase 4 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 234.17 kg\n  Factor of Safety: 1.26\n  Max Deflection: 5.04e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.1705591889846,
      "fos_buckling": 1.2645398111561281,
      "fos_yielding": 1.6092405480538938,
      "deflection": 0.005042418687539652,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.297)"
      },
      "parent_node_id": "node_2979",
      "improvement_over_parent": null
    },
    "node_2981": {
      "node_id": "node_2981",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.25 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.25236448407003,
      "fos_buckling": 1.5229621439133805,
      "fos_yielding": 2.0125753339708026,
      "deflection": 0.004040341896225085,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.277)"
      },
      "parent_node_id": "node_2980",
      "improvement_over_parent": null
    },
    "node_2982": {
      "node_id": "node_2982",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2981",
      "improvement_over_parent": null
    },
    "node_2983": {
      "node_id": "node_2983",
      "content": "INITIAL DESIGN (Trace 430)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0021)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 221.98 kg\n  Factor of Safety: 1.01\n  Max Deflection: 8.16e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.97972933058836,
      "fos_buckling": 1.0097940726288903,
      "fos_yielding": 1.4145398387448895,
      "deflection": 0.008162900662751143,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2984": {
      "node_id": "node_2984",
      "content": "MODIFICATION: Increase 0 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 225.27 kg\n  Factor of Safety: 1.01\n  Max Deflection: 7.43e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.2684435313217,
      "fos_buckling": 1.0095659280460347,
      "fos_yielding": 1.7715464103008953,
      "deflection": 0.007432972015801079,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.263)"
      },
      "parent_node_id": "node_2983",
      "improvement_over_parent": null
    },
    "node_2985": {
      "node_id": "node_2985",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 251.17 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.34e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.16588067371148,
      "fos_buckling": 1.0734037200408737,
      "fos_yielding": 2.2871339933597423,
      "deflection": 0.005340776102721667,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_2984",
      "improvement_over_parent": null
    },
    "node_2986": {
      "node_id": "node_2986",
      "content": "MODIFICATION: Increase 0 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 256.23 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.2324876799724,
      "fos_buckling": 1.0730308919090878,
      "fos_yielding": 2.287133993359741,
      "deflection": 0.005139309142681641,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.328)"
      },
      "parent_node_id": "node_2985",
      "improvement_over_parent": null
    },
    "node_2987": {
      "node_id": "node_2987",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 280.61 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.35e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 280.6139596408045,
      "fos_buckling": 1.448941583319683,
      "fos_yielding": 2.0155221560537533,
      "deflection": 0.004345378124027305,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_2986",
      "improvement_over_parent": null
    },
    "node_2988": {
      "node_id": "node_2988",
      "content": "MODIFICATION: Increase 0 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1898494980387,
      "fos_buckling": 1.5228696905944838,
      "fos_yielding": 2.0124487661798085,
      "deflection": 0.004041283387556221,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.645)"
      },
      "parent_node_id": "node_2987",
      "improvement_over_parent": null
    },
    "node_2989": {
      "node_id": "node_2989",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2988",
      "improvement_over_parent": null
    },
    "node_2990": {
      "node_id": "node_2990",
      "content": "INITIAL DESIGN (Trace 431)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2991": {
      "node_id": "node_2991",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n\nPerformance:\n  Mass: 169.47 kg\n  Factor of Safety: 0.46\n  Max Deflection: 1.17e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.46749435243024,
      "fos_buckling": 0.458587106728862,
      "fos_yielding": 1.640093558157093,
      "deflection": 11653068968591.75,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004181)"
      },
      "parent_node_id": "node_2990",
      "improvement_over_parent": null
    },
    "node_2992": {
      "node_id": "node_2992",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n\nPerformance:\n  Mass: 203.70 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.41e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.70117635031687,
      "fos_buckling": 0.8407178573063628,
      "fos_yielding": 1.8141276686285304,
      "deflection": 0.007405722428098703,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004790)"
      },
      "parent_node_id": "node_2991",
      "improvement_over_parent": null
    },
    "node_2993": {
      "node_id": "node_2993",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 256.96 kg\n  Factor of Safety: 1.02\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.95606909271993,
      "fos_buckling": 1.021785459151074,
      "fos_yielding": 2.2873946293338108,
      "deflection": 0.005882350582294693,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.287)"
      },
      "parent_node_id": "node_2992",
      "improvement_over_parent": null
    },
    "node_2994": {
      "node_id": "node_2994",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 262.17 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.169899126534,
      "fos_buckling": 1.0723332052796684,
      "fos_yielding": 2.2873946293338108,
      "deflection": 0.00485277981686593,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_2993",
      "improvement_over_parent": null
    },
    "node_2995": {
      "node_id": "node_2995",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.15 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1484451756104,
      "fos_buckling": 1.5225820560296275,
      "fos_yielding": 2.011824499241808,
      "deflection": 0.004041769462984589,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_2994",
      "improvement_over_parent": null
    },
    "node_2996": {
      "node_id": "node_2996",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_2995",
      "improvement_over_parent": null
    },
    "node_2997": {
      "node_id": "node_2997",
      "content": "INITIAL DESIGN (Trace 432)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 217.77 kg\n  Factor of Safety: 0.78\n  Max Deflection: 8.00e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.7742351074931,
      "fos_buckling": 0.7815270760502665,
      "fos_yielding": 1.47517420471442,
      "deflection": 0.00800489592482833,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_2998": {
      "node_id": "node_2998",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 221.91 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.39e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.91234876380233,
      "fos_buckling": 1.1100170997711492,
      "fos_yielding": 1.2783507312081177,
      "deflection": 0.005391714756924415,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002572)"
      },
      "parent_node_id": "node_2997",
      "improvement_over_parent": null
    },
    "node_2999": {
      "node_id": "node_2999",
      "content": "MODIFICATION: Increase 0 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 226.15 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.27e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.14661165267322,
      "fos_buckling": 1.1094792261818869,
      "fos_yielding": 1.2777312893127875,
      "deflection": 0.005271125850046984,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.200)"
      },
      "parent_node_id": "node_2998",
      "improvement_over_parent": null
    },
    "node_3000": {
      "node_id": "node_3000",
      "content": "MODIFICATION: Increase 6 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 233.76 kg\n  Factor of Safety: 1.11\n  Max Deflection: 5.08e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.76265642544675,
      "fos_buckling": 1.1086204736723493,
      "fos_yielding": 1.2767423073424016,
      "deflection": 0.005075986421339318,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.280)"
      },
      "parent_node_id": "node_2999",
      "improvement_over_parent": null
    },
    "node_3001": {
      "node_id": "node_3001",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0059)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 260.90 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.55e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.8986735089164,
      "fos_buckling": 1.2234855758800651,
      "fos_yielding": 1.4269953975274399,
      "deflection": 0.004554891836776543,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.126)"
      },
      "parent_node_id": "node_3000",
      "improvement_over_parent": null
    },
    "node_3002": {
      "node_id": "node_3002",
      "content": "MODIFICATION: Increase 7 thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0059)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0056)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 265.61 kg\n  Factor of Safety: 1.22\n  Max Deflection: 4.51e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.6057111799916,
      "fos_buckling": 1.2237673035467997,
      "fos_yielding": 1.4273239866761085,
      "deflection": 0.004514344211002732,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.178)"
      },
      "parent_node_id": "node_3001",
      "improvement_over_parent": null
    },
    "node_3003": {
      "node_id": "node_3003",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0067)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 299.82 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.01e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 299.81814802692156,
      "fos_buckling": 1.362334987025194,
      "fos_yielding": 1.614646365445234,
      "deflection": 0.004006146629500892,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.142)"
      },
      "parent_node_id": "node_3002",
      "improvement_over_parent": null
    },
    "node_3004": {
      "node_id": "node_3004",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3003",
      "improvement_over_parent": null
    },
    "node_3005": {
      "node_id": "node_3005",
      "content": "INITIAL DESIGN (Trace 433)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n\nPerformance:\n  Mass: 132.19 kg\n  Factor of Safety: 0.53\n  Max Deflection: 1.58e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 132.19269770183362,
      "fos_buckling": 0.5304331727652518,
      "fos_yielding": 1.0668771598402553,
      "deflection": 15817272494131.393,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3006": {
      "node_id": "node_3006",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n\nPerformance:\n  Mass: 147.97 kg\n  Factor of Safety: 1.19\n  Max Deflection: 2.27e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 147.97130881076825,
      "fos_buckling": 1.191741614040288,
      "fos_yielding": 1.3649095329079917,
      "deflection": 22685167418801.754,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.129)"
      },
      "parent_node_id": "node_3005",
      "improvement_over_parent": null
    },
    "node_3007": {
      "node_id": "node_3007",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 174.72 kg\n  Factor of Safety: 0.46\n  Max Deflection: 1.31e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.71930888864011,
      "fos_buckling": 0.46362949814367455,
      "fos_yielding": 0.9395538965122561,
      "deflection": 0.0131209045545319,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004449)"
      },
      "parent_node_id": "node_3006",
      "improvement_over_parent": null
    },
    "node_3008": {
      "node_id": "node_3008",
      "content": "MODIFICATION: Increase 6 thickness by 48%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 177.38 kg\n  Factor of Safety: 0.46\n  Max Deflection: 1.28e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.38135219299426,
      "fos_buckling": 0.46362949814367455,
      "fos_yielding": 1.1555778807173296,
      "deflection": 0.012759168448460825,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.484)"
      },
      "parent_node_id": "node_3007",
      "improvement_over_parent": null
    },
    "node_3009": {
      "node_id": "node_3009",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 215.87 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.32e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.8710467346377,
      "fos_buckling": 0.5216996799643923,
      "fos_yielding": 1.6439266150360243,
      "deflection": 0.008315994371818054,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005337)"
      },
      "parent_node_id": "node_3008",
      "improvement_over_parent": null
    },
    "node_3010": {
      "node_id": "node_3010",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n\nPerformance:\n  Mass: 253.16 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.67e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.1625938502652,
      "fos_buckling": 1.3502584188405555,
      "fos_yielding": 1.7389805931966056,
      "deflection": 0.004669295074952597,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005253)"
      },
      "parent_node_id": "node_3009",
      "improvement_over_parent": null
    },
    "node_3011": {
      "node_id": "node_3011",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2609888789067,
      "fos_buckling": 1.5230202121749148,
      "fos_yielding": 2.012599427232344,
      "deflection": 0.004040231103789348,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.174)"
      },
      "parent_node_id": "node_3010",
      "improvement_over_parent": null
    },
    "node_3012": {
      "node_id": "node_3012",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3011",
      "improvement_over_parent": null
    },
    "node_3013": {
      "node_id": "node_3013",
      "content": "INITIAL DESIGN (Trace 434)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 207.14 kg\n  Factor of Safety: 1.13\n  Max Deflection: 5.68e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.13977800423655,
      "fos_buckling": 1.128406006157925,
      "fos_yielding": 1.5870183548260888,
      "deflection": 0.005677646371736773,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3014": {
      "node_id": "node_3014",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.55 kg\n  Factor of Safety: 1.41\n  Max Deflection: 4.39e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.5502662364579,
      "fos_buckling": 1.4119162928912927,
      "fos_yielding": 2.0506894166857177,
      "deflection": 0.00439459454429016,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.323)"
      },
      "parent_node_id": "node_3013",
      "improvement_over_parent": null
    },
    "node_3015": {
      "node_id": "node_3015",
      "content": "MODIFICATION: Increase 0 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 274.74 kg\n  Factor of Safety: 1.36\n  Max Deflection: 4.28e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 274.73539690601626,
      "fos_buckling": 1.3589863928879449,
      "fos_yielding": 2.0496491223338626,
      "deflection": 0.004284324988518047,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.244)"
      },
      "parent_node_id": "node_3014",
      "improvement_over_parent": null
    },
    "node_3016": {
      "node_id": "node_3016",
      "content": "MODIFICATION: Increase 7 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 282.46 kg\n  Factor of Safety: 1.44\n  Max Deflection: 4.15e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.4557356802341,
      "fos_buckling": 1.441013359470534,
      "fos_yielding": 2.0484012365902067,
      "deflection": 0.004148285897620793,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.239)"
      },
      "parent_node_id": "node_3015",
      "improvement_over_parent": null
    },
    "node_3017": {
      "node_id": "node_3017",
      "content": "MODIFICATION: Increase 9 thickness by 60%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.38 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3808536131979,
      "fos_buckling": 1.5235404782552715,
      "fos_yielding": 2.01361287279501,
      "deflection": 0.004038520089826024,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.597)"
      },
      "parent_node_id": "node_3016",
      "improvement_over_parent": null
    },
    "node_3018": {
      "node_id": "node_3018",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3017",
      "improvement_over_parent": null
    },
    "node_3019": {
      "node_id": "node_3019",
      "content": "INITIAL DESIGN (Trace 435)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0022)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0024)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0027)]\n\nPerformance:\n  Mass: 149.24 kg\n  Factor of Safety: 0.75\n  Max Deflection: 8.15e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 149.24035711398943,
      "fos_buckling": 0.7460036149466552,
      "fos_yielding": 1.1235955901589016,
      "deflection": 0.008149300242668434,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3020": {
      "node_id": "node_3020",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 172.76 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.05e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.75975332757798,
      "fos_buckling": 0.854219855736246,
      "fos_yielding": 1.299166308132766,
      "deflection": 0.0070472382922245405,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.166)"
      },
      "parent_node_id": "node_3019",
      "improvement_over_parent": null
    },
    "node_3021": {
      "node_id": "node_3021",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 193.44 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.30e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.43902496846079,
      "fos_buckling": 0.947264367088481,
      "fos_yielding": 1.4531793775616058,
      "deflection": 0.006299611606395436,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.127)"
      },
      "parent_node_id": "node_3020",
      "improvement_over_parent": null
    },
    "node_3022": {
      "node_id": "node_3022",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 216.76 kg\n  Factor of Safety: 1.05\n  Max Deflection: 5.63e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.76263640789068,
      "fos_buckling": 1.049842946778989,
      "fos_yielding": 1.6264778699057412,
      "deflection": 0.005627508727943763,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.129)"
      },
      "parent_node_id": "node_3021",
      "improvement_over_parent": null
    },
    "node_3023": {
      "node_id": "node_3023",
      "content": "MODIFICATION: Increase 1 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 225.67 kg\n  Factor of Safety: 1.05\n  Max Deflection: 5.36e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.67205276171143,
      "fos_buckling": 1.0532270031099047,
      "fos_yielding": 1.65520731761082,
      "deflection": 0.005359451965062963,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.473)"
      },
      "parent_node_id": "node_3022",
      "improvement_over_parent": null
    },
    "node_3024": {
      "node_id": "node_3024",
      "content": "MODIFICATION: Increase 10 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 233.75 kg\n  Factor of Safety: 1.06\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.7540939987432,
      "fos_buckling": 1.0559360389427355,
      "fos_yielding": 1.6799729206178835,
      "deflection": 0.005136564503883464,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.300)"
      },
      "parent_node_id": "node_3023",
      "improvement_over_parent": null
    },
    "node_3025": {
      "node_id": "node_3025",
      "content": "MODIFICATION: Increase 7 thickness by 44%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 244.21 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.84e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.2074469471155,
      "fos_buckling": 1.3099463582171662,
      "fos_yielding": 1.6779184125290223,
      "deflection": 0.004838071614958315,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.441)"
      },
      "parent_node_id": "node_3024",
      "improvement_over_parent": null
    },
    "node_3026": {
      "node_id": "node_3026",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.35 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3479786344443,
      "fos_buckling": 1.5231592339662632,
      "fos_yielding": 2.013324782666338,
      "deflection": 0.004039109250849044,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.221)"
      },
      "parent_node_id": "node_3025",
      "improvement_over_parent": null
    },
    "node_3027": {
      "node_id": "node_3027",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3026",
      "improvement_over_parent": null
    },
    "node_3028": {
      "node_id": "node_3028",
      "content": "INITIAL DESIGN (Trace 436)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0018)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 126.84 kg\n  Factor of Safety: 0.36\n  Max Deflection: 1.17e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 126.83700197299612,
      "fos_buckling": 0.3637507255374817,
      "fos_yielding": 1.0113829953478075,
      "deflection": 0.011691295380803565,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3029": {
      "node_id": "node_3029",
      "content": "MODIFICATION: Increase 6 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0028)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0030)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0025)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0030)]\n\nPerformance:\n  Mass: 134.87 kg\n  Factor of Safety: 0.56\n  Max Deflection: 9.85e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 134.86594464141172,
      "fos_buckling": 0.5583014920292355,
      "fos_yielding": 1.0112997629266594,
      "deflection": 0.009846339381630412,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.608)"
      },
      "parent_node_id": "node_3028",
      "improvement_over_parent": null
    },
    "node_3030": {
      "node_id": "node_3030",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 153.23 kg\n  Factor of Safety: 0.63\n  Max Deflection: 8.68e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.22969546977015,
      "fos_buckling": 0.626343585504542,
      "fos_yielding": 1.1484907574810546,
      "deflection": 0.008676178111983714,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.143)"
      },
      "parent_node_id": "node_3029",
      "improvement_over_parent": null
    },
    "node_3031": {
      "node_id": "node_3031",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n\nPerformance:\n  Mass: 193.49 kg\n  Factor of Safety: 0.77\n  Max Deflection: 6.89e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.4925355617622,
      "fos_buckling": 0.7689200116586786,
      "fos_yielding": 1.448858118912548,
      "deflection": 0.006887934317640913,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.280)"
      },
      "parent_node_id": "node_3030",
      "improvement_over_parent": null
    },
    "node_3032": {
      "node_id": "node_3032",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 229.65 kg\n  Factor of Safety: 0.89\n  Max Deflection: 5.82e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.6460935355022,
      "fos_buckling": 0.8892601692113501,
      "fos_yielding": 1.7180718603598013,
      "deflection": 0.005816520906508815,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.202)"
      },
      "parent_node_id": "node_3031",
      "improvement_over_parent": null
    },
    "node_3033": {
      "node_id": "node_3033",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 267.48 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.48266372925946,
      "fos_buckling": 1.0074736892973568,
      "fos_yielding": 1.9993151035218917,
      "deflection": 0.00500539893567532,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.181)"
      },
      "parent_node_id": "node_3032",
      "improvement_over_parent": null
    },
    "node_3034": {
      "node_id": "node_3034",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.38 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.38010087164923,
      "fos_buckling": 1.5235131062949805,
      "fos_yielding": 2.0134415828920527,
      "deflection": 0.004038504201180951,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_3033",
      "improvement_over_parent": null
    },
    "node_3035": {
      "node_id": "node_3035",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3034",
      "improvement_over_parent": null
    },
    "node_3036": {
      "node_id": "node_3036",
      "content": "INITIAL DESIGN (Trace 437)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 209.77 kg\n  Factor of Safety: 1.12\n  Max Deflection: 5.59e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.7721328479632,
      "fos_buckling": 1.118318323512961,
      "fos_yielding": 1.4723663896784926,
      "deflection": 0.005594674248989547,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3037": {
      "node_id": "node_3037",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 243.81 kg\n  Factor of Safety: 1.28\n  Max Deflection: 4.82e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.81012768521737,
      "fos_buckling": 1.2787036677563728,
      "fos_yielding": 1.7096136568508353,
      "deflection": 0.00482323188910214,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.175)"
      },
      "parent_node_id": "node_3036",
      "improvement_over_parent": null
    },
    "node_3038": {
      "node_id": "node_3038",
      "content": "MODIFICATION: Increase 2 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 248.96 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.75e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.95710800277524,
      "fos_buckling": 1.3315445557216765,
      "fos_yielding": 1.7103773728726162,
      "deflection": 0.004746951763432202,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.330)"
      },
      "parent_node_id": "node_3037",
      "improvement_over_parent": null
    },
    "node_3039": {
      "node_id": "node_3039",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.15613520025516,
      "fos_buckling": 1.5226360337019946,
      "fos_yielding": 2.012026114500598,
      "deflection": 0.004041601429403581,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.195)"
      },
      "parent_node_id": "node_3038",
      "improvement_over_parent": null
    },
    "node_3040": {
      "node_id": "node_3040",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3039",
      "improvement_over_parent": null
    },
    "node_3041": {
      "node_id": "node_3041",
      "content": "INITIAL DESIGN (Trace 438)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0033)]\n\nPerformance:\n  Mass: 142.52 kg\n  Factor of Safety: 0.61\n  Max Deflection: 1.06e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 142.52157027073306,
      "fos_buckling": 0.610011251210175,
      "fos_yielding": 1.2605133359290677,
      "deflection": 0.01062870753228997,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3042": {
      "node_id": "node_3042",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 169.88 kg\n  Factor of Safety: 0.71\n  Max Deflection: 8.93e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.87891878990376,
      "fos_buckling": 0.7142688297489016,
      "fos_yielding": 1.5018765760758737,
      "deflection": 0.008925750617232876,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.203)"
      },
      "parent_node_id": "node_3041",
      "improvement_over_parent": null
    },
    "node_3043": {
      "node_id": "node_3043",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 189.96 kg\n  Factor of Safety: 0.79\n  Max Deflection: 7.99e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 189.95984074491358,
      "fos_buckling": 0.7881666965351449,
      "fos_yielding": 1.6789138420035303,
      "deflection": 0.007987934468439331,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.126)"
      },
      "parent_node_id": "node_3042",
      "improvement_over_parent": null
    },
    "node_3044": {
      "node_id": "node_3044",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n\nPerformance:\n  Mass: 207.85 kg\n  Factor of Safety: 0.80\n  Max Deflection: 8.00e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.8536444285522,
      "fos_buckling": 0.7985682379161473,
      "fos_yielding": 1.687769495861296,
      "deflection": 0.007996057854999641,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003479)"
      },
      "parent_node_id": "node_3043",
      "improvement_over_parent": null
    },
    "node_3045": {
      "node_id": "node_3045",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n\nPerformance:\n  Mass: 243.65 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.83e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.65446953598183,
      "fos_buckling": 0.9145411598791893,
      "fos_yielding": 1.9761951394055135,
      "deflection": 0.0068306510793556055,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.186)"
      },
      "parent_node_id": "node_3044",
      "improvement_over_parent": null
    },
    "node_3046": {
      "node_id": "node_3046",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 283.20 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.89e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.20115870572414,
      "fos_buckling": 1.0353590506291983,
      "fos_yielding": 2.293998911139622,
      "deflection": 0.005885877031273896,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.178)"
      },
      "parent_node_id": "node_3045",
      "improvement_over_parent": null
    },
    "node_3047": {
      "node_id": "node_3047",
      "content": "MODIFICATION: Increase 8 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0074)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 290.67 kg\n  Factor of Safety: 1.05\n  Max Deflection: 5.66e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.6699606582154,
      "fos_buckling": 1.0515238179811592,
      "fos_yielding": 2.3102435278373976,
      "deflection": 0.005655788913826856,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.188)"
      },
      "parent_node_id": "node_3046",
      "improvement_over_parent": null
    },
    "node_3048": {
      "node_id": "node_3048",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0074)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 295.88 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.97e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 295.8837906920295,
      "fos_buckling": 1.5286930980310411,
      "fos_yielding": 2.03874375518083,
      "deflection": 0.0039747355918548135,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3047",
      "improvement_over_parent": null
    },
    "node_3049": {
      "node_id": "node_3049",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3048",
      "improvement_over_parent": null
    },
    "node_3050": {
      "node_id": "node_3050",
      "content": "INITIAL DESIGN (Trace 439)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 122.22 kg\n  Factor of Safety: 0.21\n  Max Deflection: 5.32e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 122.22358874929718,
      "fos_buckling": 0.20903270076356148,
      "fos_yielding": 0.6080323364908599,
      "deflection": 53160739529204.52,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3051": {
      "node_id": "node_3051",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 143.99 kg\n  Factor of Safety: 1.00\n  Max Deflection: 2.17e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 143.99363235682478,
      "fos_buckling": 1.002316177669546,
      "fos_yielding": 1.5149236570266706,
      "deflection": 21735750191763.71,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.189)"
      },
      "parent_node_id": "node_3050",
      "improvement_over_parent": null
    },
    "node_3052": {
      "node_id": "node_3052",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n\nPerformance:\n  Mass: 173.34 kg\n  Factor of Safety: 0.73\n  Max Deflection: 8.63e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.33653487121882,
      "fos_buckling": 0.7280451938043472,
      "fos_yielding": 1.5472861617926978,
      "deflection": 0.008630044173391855,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004063)"
      },
      "parent_node_id": "node_3051",
      "improvement_over_parent": null
    },
    "node_3053": {
      "node_id": "node_3053",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n\nPerformance:\n  Mass: 225.80 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.64e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.80325122564523,
      "fos_buckling": 0.9120974546341423,
      "fos_yielding": 2.0113964098374755,
      "deflection": 0.006637975512778106,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.328)"
      },
      "parent_node_id": "node_3052",
      "improvement_over_parent": null
    },
    "node_3054": {
      "node_id": "node_3054",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n\nPerformance:\n  Mass: 254.93 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.64e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 254.9282860635579,
      "fos_buckling": 0.9374501095484301,
      "fos_yielding": 2.034274442502679,
      "deflection": 0.0066351134844157495,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004710)"
      },
      "parent_node_id": "node_3053",
      "improvement_over_parent": null
    },
    "node_3055": {
      "node_id": "node_3055",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 288.10 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.1049760551185,
      "fos_buckling": 1.036746716355841,
      "fos_yielding": 2.2968501950918134,
      "deflection": 0.005877502981706937,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.143)"
      },
      "parent_node_id": "node_3054",
      "improvement_over_parent": null
    },
    "node_3056": {
      "node_id": "node_3056",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.32 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3188060889326,
      "fos_buckling": 1.5233411269259798,
      "fos_yielding": 2.0132521161353907,
      "deflection": 0.004039473525953104,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3055",
      "improvement_over_parent": null
    },
    "node_3057": {
      "node_id": "node_3057",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3056",
      "improvement_over_parent": null
    },
    "node_3058": {
      "node_id": "node_3058",
      "content": "INITIAL DESIGN (Trace 440)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3059": {
      "node_id": "node_3059",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 169.43 kg\n  Factor of Safety: 0.48\n  Max Deflection: 8.29e+12 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.4290429743541,
      "fos_buckling": 0.4791060841389439,
      "fos_yielding": 0.8784964460501457,
      "deflection": 8292991010803.939,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_3058",
      "improvement_over_parent": null
    },
    "node_3060": {
      "node_id": "node_3060",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 214.01 kg\n  Factor of Safety: 0.96\n  Max Deflection: 4.44e+12 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.01097414229997,
      "fos_buckling": 0.9582121682778878,
      "fos_yielding": 1.219333817395628,
      "deflection": 4436444365189.084,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_3059",
      "improvement_over_parent": null
    },
    "node_3061": {
      "node_id": "node_3061",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 257.21 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.10e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.2090320797522,
      "fos_buckling": 1.0071858164387444,
      "fos_yielding": 1.3929082257194323,
      "deflection": 0.005099589148825242,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_3060",
      "improvement_over_parent": null
    },
    "node_3062": {
      "node_id": "node_3062",
      "content": "MODIFICATION: Increase 6 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0078)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 270.51 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.03e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 270.51082786914606,
      "fos_buckling": 1.006268475300886,
      "fos_yielding": 1.376902164508247,
      "deflection": 0.005025797495580554,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.497)"
      },
      "parent_node_id": "node_3061",
      "improvement_over_parent": null
    },
    "node_3063": {
      "node_id": "node_3063",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0078)]\n  M7: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 303.42 kg\n  Factor of Safety: 1.19\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 303.42336450076306,
      "fos_buckling": 1.192529277355232,
      "fos_yielding": 1.3872120518739086,
      "deflection": 0.004061310792083149,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_3062",
      "improvement_over_parent": null
    },
    "node_3064": {
      "node_id": "node_3064",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3063",
      "improvement_over_parent": null
    },
    "node_3065": {
      "node_id": "node_3065",
      "content": "INITIAL DESIGN (Trace 441)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 200.21 kg\n  Factor of Safety: 0.83\n  Max Deflection: 8.01e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.21059270210304,
      "fos_buckling": 0.8286471739819374,
      "fos_yielding": 1.7931112070127717,
      "deflection": 0.008009168888436976,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3066": {
      "node_id": "node_3066",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 220.65 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.98e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 220.65087582127776,
      "fos_buckling": 0.8442420046444368,
      "fos_yielding": 1.8406067046612757,
      "deflection": 0.007980183984055459,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003876)"
      },
      "parent_node_id": "node_3065",
      "improvement_over_parent": null
    },
    "node_3067": {
      "node_id": "node_3067",
      "content": "MODIFICATION: Increase 0 thickness by 36%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 227.32 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.43e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.3188792446862,
      "fos_buckling": 0.8510569445341842,
      "fos_yielding": 1.8153086224533836,
      "deflection": 0.007434280671254576,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.355)"
      },
      "parent_node_id": "node_3066",
      "improvement_over_parent": null
    },
    "node_3068": {
      "node_id": "node_3068",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 231.43 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.10e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.4345224226218,
      "fos_buckling": 1.252058942916805,
      "fos_yielding": 1.5906363688825345,
      "deflection": 0.005101236438971596,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002557)"
      },
      "parent_node_id": "node_3067",
      "improvement_over_parent": null
    },
    "node_3069": {
      "node_id": "node_3069",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 260.45 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.54e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.4466199916643,
      "fos_buckling": 1.3825176560663481,
      "fos_yielding": 1.788863559535774,
      "deflection": 0.004540634154217479,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.136)"
      },
      "parent_node_id": "node_3068",
      "improvement_over_parent": null
    },
    "node_3070": {
      "node_id": "node_3070",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1573444542166,
      "fos_buckling": 1.5226454806540084,
      "fos_yielding": 2.0120509298542277,
      "deflection": 0.0040416425123005585,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_3069",
      "improvement_over_parent": null
    },
    "node_3071": {
      "node_id": "node_3071",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3070",
      "improvement_over_parent": null
    },
    "node_3072": {
      "node_id": "node_3072",
      "content": "INITIAL DESIGN (Trace 442)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0039)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 175.86 kg\n  Factor of Safety: 0.79\n  Max Deflection: 4.32e+11 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 175.86182634027244,
      "fos_buckling": 0.7900526970470485,
      "fos_yielding": 1.6937935179172223,
      "deflection": 431942225037.9153,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3073": {
      "node_id": "node_3073",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 195.45 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.14e+11 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.4532619573336,
      "fos_buckling": 0.8647254678093466,
      "fos_yielding": 1.8685587892754525,
      "deflection": 614070844057.898,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.120)"
      },
      "parent_node_id": "node_3072",
      "improvement_over_parent": null
    },
    "node_3074": {
      "node_id": "node_3074",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n\nPerformance:\n  Mass: 216.75 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.13e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.74997695191735,
      "fos_buckling": 0.8703576726256105,
      "fos_yielding": 1.88125090526896,
      "deflection": 0.0071305514298100935,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004051)"
      },
      "parent_node_id": "node_3073",
      "improvement_over_parent": null
    },
    "node_3075": {
      "node_id": "node_3075",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 263.73 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.87e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.72534399134526,
      "fos_buckling": 1.0262633463706199,
      "fos_yielding": 2.2879304367464,
      "deflection": 0.0058685112132809214,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.238)"
      },
      "parent_node_id": "node_3074",
      "improvement_over_parent": null
    },
    "node_3076": {
      "node_id": "node_3076",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 268.94 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.93917402515933,
      "fos_buckling": 1.0724042350926402,
      "fos_yielding": 2.2879304367464006,
      "deflection": 0.004851160796574274,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3075",
      "improvement_over_parent": null
    },
    "node_3077": {
      "node_id": "node_3077",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.32 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3206459859914,
      "fos_buckling": 1.5232211585230087,
      "fos_yielding": 2.0131742117876796,
      "deflection": 0.004039433844226135,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_3076",
      "improvement_over_parent": null
    },
    "node_3078": {
      "node_id": "node_3078",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3077",
      "improvement_over_parent": null
    },
    "node_3079": {
      "node_id": "node_3079",
      "content": "INITIAL DESIGN (Trace 443)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0014)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n\nPerformance:\n  Mass: 127.65 kg\n  Factor of Safety: 0.30\n  Max Deflection: 1.42e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 127.64652831471251,
      "fos_buckling": 0.3028804486664754,
      "fos_yielding": 0.8385874343486592,
      "deflection": 0.014249293279845471,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3080": {
      "node_id": "node_3080",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0014)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 151.33 kg\n  Factor of Safety: 0.74\n  Max Deflection: 7.77e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.33119048551868,
      "fos_buckling": 0.7354768438336357,
      "fos_yielding": 1.0714829931863303,
      "deflection": 0.0077699202246696904,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003186)"
      },
      "parent_node_id": "node_3079",
      "improvement_over_parent": null
    },
    "node_3081": {
      "node_id": "node_3081",
      "content": "MODIFICATION: Increase 4 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 152.42 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.67e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.42028890394448,
      "fos_buckling": 0.832458805280676,
      "fos_yielding": 1.0718952958073447,
      "deflection": 0.007673733971105451,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.429)"
      },
      "parent_node_id": "node_3080",
      "improvement_over_parent": null
    },
    "node_3082": {
      "node_id": "node_3082",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 195.42 kg\n  Factor of Safety: 1.05\n  Max Deflection: 6.00e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.42076247739428,
      "fos_buckling": 1.0461103251036674,
      "fos_yielding": 1.3726271705828674,
      "deflection": 0.006000347884456245,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_3081",
      "improvement_over_parent": null
    },
    "node_3083": {
      "node_id": "node_3083",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 240.25 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.89e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.24640003851698,
      "fos_buckling": 1.258945298848379,
      "fos_yielding": 1.6853231235756698,
      "deflection": 0.004893643317243717,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.247)"
      },
      "parent_node_id": "node_3082",
      "improvement_over_parent": null
    },
    "node_3084": {
      "node_id": "node_3084",
      "content": "MODIFICATION: Increase 2 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 245.41 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.81e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.40794469774033,
      "fos_buckling": 1.3156333226707184,
      "fos_yielding": 1.6860930858520276,
      "deflection": 0.00481463506672128,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.337)"
      },
      "parent_node_id": "node_3083",
      "improvement_over_parent": null
    },
    "node_3085": {
      "node_id": "node_3085",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.45 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4457783275397,
      "fos_buckling": 1.5238606517903373,
      "fos_yielding": 2.013958851335745,
      "deflection": 0.004037699589452655,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.215)"
      },
      "parent_node_id": "node_3084",
      "improvement_over_parent": null
    },
    "node_3086": {
      "node_id": "node_3086",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3085",
      "improvement_over_parent": null
    },
    "node_3087": {
      "node_id": "node_3087",
      "content": "INITIAL DESIGN (Trace 444)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3088": {
      "node_id": "node_3088",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0027)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n\nPerformance:\n  Mass: 153.69 kg\n  Factor of Safety: 0.47\n  Max Deflection: 1.12e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.69054947860087,
      "fos_buckling": 0.4733824677513623,
      "fos_yielding": 1.4646226995278906,
      "deflection": 0.011248130475156038,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003917)"
      },
      "parent_node_id": "node_3087",
      "improvement_over_parent": null
    },
    "node_3089": {
      "node_id": "node_3089",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 200.72 kg\n  Factor of Safety: 0.59\n  Max Deflection: 8.63e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.71526730773277,
      "fos_buckling": 0.5903504812947973,
      "fos_yielding": 1.9037628646067257,
      "deflection": 0.008634288036258755,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.333)"
      },
      "parent_node_id": "node_3088",
      "improvement_over_parent": null
    },
    "node_3090": {
      "node_id": "node_3090",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 243.91 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.92e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 243.91332524518498,
      "fos_buckling": 1.0738460802673413,
      "fos_yielding": 2.2868966786205602,
      "deflection": 0.005920007827237808,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_3089",
      "improvement_over_parent": null
    },
    "node_3091": {
      "node_id": "node_3091",
      "content": "MODIFICATION: Increase 1 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 257.11 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.11e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 257.1097495557065,
      "fos_buckling": 1.072874674868822,
      "fos_yielding": 2.2868966786205585,
      "deflection": 0.005111092987022315,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.661)"
      },
      "parent_node_id": "node_3090",
      "improvement_over_parent": null
    },
    "node_3092": {
      "node_id": "node_3092",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 281.49 kg\n  Factor of Safety: 1.47\n  Max Deflection: 4.32e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.49122151653864,
      "fos_buckling": 1.4713821917433751,
      "fos_yielding": 2.0150675565785345,
      "deflection": 0.004315691074740555,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_3091",
      "improvement_over_parent": null
    },
    "node_3093": {
      "node_id": "node_3093",
      "content": "MODIFICATION: Increase 0 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.20 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.20086575606115,
      "fos_buckling": 1.5226229278567356,
      "fos_yielding": 2.012282528451442,
      "deflection": 0.004041013821013873,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.577)"
      },
      "parent_node_id": "node_3092",
      "improvement_over_parent": null
    },
    "node_3094": {
      "node_id": "node_3094",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3093",
      "improvement_over_parent": null
    },
    "node_3095": {
      "node_id": "node_3095",
      "content": "INITIAL DESIGN (Trace 445)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0035)]\n\nPerformance:\n  Mass: 153.63 kg\n  Factor of Safety: 0.63\n  Max Deflection: 8.65e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.63216780709968,
      "fos_buckling": 0.6275653521582916,
      "fos_yielding": 1.1515931303201468,
      "deflection": 0.008654391644723735,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3096": {
      "node_id": "node_3096",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 170.21 kg\n  Factor of Safety: 0.69\n  Max Deflection: 7.82e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.2050776472651,
      "fos_buckling": 0.6872929093667456,
      "fos_yielding": 1.2753079092000021,
      "deflection": 0.00781972675044534,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.114)"
      },
      "parent_node_id": "node_3095",
      "improvement_over_parent": null
    },
    "node_3097": {
      "node_id": "node_3097",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 211.13 kg\n  Factor of Safety: 0.83\n  Max Deflection: 6.32e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 211.13299756685865,
      "fos_buckling": 0.8282367036018465,
      "fos_yielding": 1.5804048228989547,
      "deflection": 0.006319837826896419,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.258)"
      },
      "parent_node_id": "node_3096",
      "improvement_over_parent": null
    },
    "node_3098": {
      "node_id": "node_3098",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 231.59 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.10e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.59292037534303,
      "fos_buckling": 1.252721542872215,
      "fos_yielding": 1.5916243663890135,
      "deflection": 0.005097813617937348,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003880)"
      },
      "parent_node_id": "node_3097",
      "improvement_over_parent": null
    },
    "node_3099": {
      "node_id": "node_3099",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.19 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.19480778848407,
      "fos_buckling": 1.5227278477401158,
      "fos_yielding": 2.0121892350620127,
      "deflection": 0.004041149719051582,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.292)"
      },
      "parent_node_id": "node_3098",
      "improvement_over_parent": null
    },
    "node_3100": {
      "node_id": "node_3100",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3099",
      "improvement_over_parent": null
    },
    "node_3101": {
      "node_id": "node_3101",
      "content": "INITIAL DESIGN (Trace 446)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 194.60 kg\n  Factor of Safety: 0.87\n  Max Deflection: 6.54e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.6006521552293,
      "fos_buckling": 0.8677112313187877,
      "fos_yielding": 1.7714220265492326,
      "deflection": 0.006542724403831791,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3102": {
      "node_id": "node_3102",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 251.69 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.08e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.6882478298524,
      "fos_buckling": 1.07347605565669,
      "fos_yielding": 2.2883590082730056,
      "deflection": 0.005075375814069377,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.321)"
      },
      "parent_node_id": "node_3101",
      "improvement_over_parent": null
    },
    "node_3103": {
      "node_id": "node_3103",
      "content": "MODIFICATION: Increase 0 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.29 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.28914351363204,
      "fos_buckling": 1.0726962559942612,
      "fos_yielding": 2.2883590082730056,
      "deflection": 0.004850615306006825,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.497)"
      },
      "parent_node_id": "node_3102",
      "improvement_over_parent": null
    },
    "node_3104": {
      "node_id": "node_3104",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 283.10 kg\n  Factor of Safety: 1.45\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 283.10448217590937,
      "fos_buckling": 1.4476131872313263,
      "fos_yielding": 2.044315700998678,
      "deflection": 0.004139900435874294,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003401)"
      },
      "parent_node_id": "node_3103",
      "improvement_over_parent": null
    },
    "node_3105": {
      "node_id": "node_3105",
      "content": "MODIFICATION: Increase 9 thickness by 54%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0096)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 303.66 kg\n  Factor of Safety: 1.54\n  Max Deflection: 3.88e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 303.6649479893661,
      "fos_buckling": 1.5351015649435389,
      "fos_yielding": 2.081053401004603,
      "deflection": 0.0038781368583898535,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.536)"
      },
      "parent_node_id": "node_3104",
      "improvement_over_parent": null
    },
    "node_3106": {
      "node_id": "node_3106",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3105",
      "improvement_over_parent": null
    },
    "node_3107": {
      "node_id": "node_3107",
      "content": "INITIAL DESIGN (Trace 447)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3108": {
      "node_id": "node_3108",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 227.30 kg\n  Factor of Safety: 0.53\n  Max Deflection: 2.08e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.29648658064048,
      "fos_buckling": 0.5283758223581874,
      "fos_yielding": 1.8183509820730588,
      "deflection": 0.020818074314124458,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_3107",
      "improvement_over_parent": null
    },
    "node_3109": {
      "node_id": "node_3109",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 270.49 kg\n  Factor of Safety: 1.03\n  Max Deflection: 6.39e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 270.4945445180927,
      "fos_buckling": 1.0264687570143383,
      "fos_yielding": 2.3320456518250867,
      "deflection": 0.006387070360383882,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_3108",
      "improvement_over_parent": null
    },
    "node_3110": {
      "node_id": "node_3110",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 275.71 kg\n  Factor of Safety: 1.41\n  Max Deflection: 4.34e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 275.7083745519068,
      "fos_buckling": 1.414665605579671,
      "fos_yielding": 2.041614013714616,
      "deflection": 0.004335281497131351,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3109",
      "improvement_over_parent": null
    },
    "node_3111": {
      "node_id": "node_3111",
      "content": "MODIFICATION: Increase 0 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 285.29 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 285.2921061125715,
      "fos_buckling": 1.4020321525972568,
      "fos_yielding": 2.0396578237756264,
      "deflection": 0.004127236782627058,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.431)"
      },
      "parent_node_id": "node_3110",
      "improvement_over_parent": null
    },
    "node_3112": {
      "node_id": "node_3112",
      "content": "MODIFICATION: Increase 3 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.226314140706,
      "fos_buckling": 1.5229000669299342,
      "fos_yielding": 2.0124467403596396,
      "deflection": 0.004040699762147771,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.529)"
      },
      "parent_node_id": "node_3111",
      "improvement_over_parent": null
    },
    "node_3113": {
      "node_id": "node_3113",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3112",
      "improvement_over_parent": null
    },
    "node_3114": {
      "node_id": "node_3114",
      "content": "INITIAL DESIGN (Trace 448)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 210.63 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.71e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.63031615231,
      "fos_buckling": 0.8971374919270745,
      "fos_yielding": 1.1974468762940278,
      "deflection": 0.005712322078416612,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3115": {
      "node_id": "node_3115",
      "content": "MODIFICATION: Increase 8 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 216.55 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.65e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.55441604544947,
      "fos_buckling": 0.8953379693105914,
      "fos_yielding": 1.1979003701860809,
      "deflection": 0.00565271292155225,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.295)"
      },
      "parent_node_id": "node_3114",
      "improvement_over_parent": null
    },
    "node_3116": {
      "node_id": "node_3116",
      "content": "MODIFICATION: Increase 2 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 223.11 kg\n  Factor of Safety: 0.89\n  Max Deflection: 5.56e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.106883417888,
      "fos_buckling": 0.8925302276089573,
      "fos_yielding": 1.1987014219013952,
      "deflection": 0.005556736894907556,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.466)"
      },
      "parent_node_id": "node_3115",
      "improvement_over_parent": null
    },
    "node_3117": {
      "node_id": "node_3117",
      "content": "MODIFICATION: Increase 6 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 225.50 kg\n  Factor of Safety: 0.92\n  Max Deflection: 5.45e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.4958427623563,
      "fos_buckling": 0.9243549682630493,
      "fos_yielding": 1.6623126355997735,
      "deflection": 0.0054549221286354765,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.431)"
      },
      "parent_node_id": "node_3116",
      "improvement_over_parent": null
    },
    "node_3118": {
      "node_id": "node_3118",
      "content": "MODIFICATION: Increase 9 thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 230.43 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.37e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.43128327358892,
      "fos_buckling": 0.9535931397500161,
      "fos_yielding": 1.648601869896488,
      "deflection": 0.005368029969798027,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.253)"
      },
      "parent_node_id": "node_3117",
      "improvement_over_parent": null
    },
    "node_3119": {
      "node_id": "node_3119",
      "content": "MODIFICATION: Increase 5 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 231.74 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.26e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.73542269122706,
      "fos_buckling": 0.9730530763819499,
      "fos_yielding": 1.6403432616385876,
      "deflection": 0.005257069703538293,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.458)"
      },
      "parent_node_id": "node_3118",
      "improvement_over_parent": null
    },
    "node_3120": {
      "node_id": "node_3120",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 276.65 kg\n  Factor of Safety: 1.14\n  Max Deflection: 4.41e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 276.64779905041365,
      "fos_buckling": 1.143085876676302,
      "fos_yielding": 1.9557060278886842,
      "deflection": 0.004412034597536091,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.212)"
      },
      "parent_node_id": "node_3119",
      "improvement_over_parent": null
    },
    "node_3121": {
      "node_id": "node_3121",
      "content": "MODIFICATION: Increase 10 thickness by 65%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.29 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.29138851542444,
      "fos_buckling": 1.523177066778782,
      "fos_yielding": 2.014524505764136,
      "deflection": 0.004039574953857229,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.653)"
      },
      "parent_node_id": "node_3120",
      "improvement_over_parent": null
    },
    "node_3122": {
      "node_id": "node_3122",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3121",
      "improvement_over_parent": null
    },
    "node_3123": {
      "node_id": "node_3123",
      "content": "INITIAL DESIGN (Trace 449)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0020)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0020)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0012)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0017)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0010)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0011)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0016)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0021)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0019)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0018)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0022)]\n\nPerformance:\n  Mass: 103.84 kg\n  Factor of Safety: 0.55\n  Max Deflection: 1.13e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 103.841605551355,
      "fos_buckling": 0.5506270457305616,
      "fos_yielding": 0.7404542410988122,
      "deflection": 0.011271802834687485,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3124": {
      "node_id": "node_3124",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0014)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0012)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 125.28 kg\n  Factor of Safety: 0.66\n  Max Deflection: 9.35e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 125.28285905218651,
      "fos_buckling": 0.6584540048513801,
      "fos_yielding": 0.8927589389470784,
      "deflection": 0.009354219554491863,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.214)"
      },
      "parent_node_id": "node_3123",
      "improvement_over_parent": null
    },
    "node_3125": {
      "node_id": "node_3125",
      "content": "MODIFICATION: Increase 4 thickness by 34%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0025)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0014)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0026)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 126.06 kg\n  Factor of Safety: 0.66\n  Max Deflection: 9.26e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 126.05592864001268,
      "fos_buckling": 0.65541790269414,
      "fos_yielding": 0.8930245494967123,
      "deflection": 0.009264953092294996,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.342)"
      },
      "parent_node_id": "node_3124",
      "improvement_over_parent": null
    },
    "node_3126": {
      "node_id": "node_3126",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0017)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0026)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0031)]\n\nPerformance:\n  Mass: 148.99 kg\n  Factor of Safety: 0.77\n  Max Deflection: 7.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 148.99362610862565,
      "fos_buckling": 0.7675197399897764,
      "fos_yielding": 1.054819342638806,
      "deflection": 0.007849069864238141,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.190)"
      },
      "parent_node_id": "node_3125",
      "improvement_over_parent": null
    },
    "node_3127": {
      "node_id": "node_3127",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0022)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 194.41 kg\n  Factor of Safety: 0.98\n  Max Deflection: 6.03e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.40753486346267,
      "fos_buckling": 0.9829804857110311,
      "fos_yielding": 1.3745012737893236,
      "deflection": 0.00603139364682184,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.323)"
      },
      "parent_node_id": "node_3126",
      "improvement_over_parent": null
    },
    "node_3128": {
      "node_id": "node_3128",
      "content": "MODIFICATION: Increase 2 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 199.99 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.89e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.9899792789558,
      "fos_buckling": 1.1040186257286462,
      "fos_yielding": 1.3754209899223981,
      "deflection": 0.005892538123003805,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.490)"
      },
      "parent_node_id": "node_3127",
      "improvement_over_parent": null
    },
    "node_3129": {
      "node_id": "node_3129",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 258.70 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.57e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.6951633860522,
      "fos_buckling": 1.374744866911589,
      "fos_yielding": 1.7768092572760532,
      "deflection": 0.004570925961485525,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.318)"
      },
      "parent_node_id": "node_3128",
      "improvement_over_parent": null
    },
    "node_3130": {
      "node_id": "node_3130",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3049547563711,
      "fos_buckling": 1.5231953517154904,
      "fos_yielding": 2.012951539330586,
      "deflection": 0.00403965581533215,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.147)"
      },
      "parent_node_id": "node_3129",
      "improvement_over_parent": null
    },
    "node_3131": {
      "node_id": "node_3131",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3130",
      "improvement_over_parent": null
    },
    "node_3132": {
      "node_id": "node_3132",
      "content": "INITIAL DESIGN (Trace 450)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3133": {
      "node_id": "node_3133",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n\nPerformance:\n  Mass: 229.89 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.48e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.88828040152077,
      "fos_buckling": 0.9311408965345914,
      "fos_yielding": 2.0611845302421345,
      "deflection": 0.006477000255247822,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004695)"
      },
      "parent_node_id": "node_3132",
      "improvement_over_parent": null
    },
    "node_3134": {
      "node_id": "node_3134",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 259.75 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.47e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.74654664103156,
      "fos_buckling": 0.9510928398497396,
      "fos_yielding": 2.078856658825029,
      "deflection": 0.006474845323407623,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004839)"
      },
      "parent_node_id": "node_3133",
      "improvement_over_parent": null
    },
    "node_3135": {
      "node_id": "node_3135",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n\nPerformance:\n  Mass: 264.48 kg\n  Factor of Safety: 1.24\n  Max Deflection: 4.50e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 264.4781375869184,
      "fos_buckling": 1.2354171186535383,
      "fos_yielding": 1.8264211236115542,
      "deflection": 0.004495823066445182,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002973)"
      },
      "parent_node_id": "node_3134",
      "improvement_over_parent": null
    },
    "node_3136": {
      "node_id": "node_3136",
      "content": "MODIFICATION: Increase 4 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0052)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0035)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n\nPerformance:\n  Mass: 266.05 kg\n  Factor of Safety: 1.41\n  Max Deflection: 4.45e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 266.0468317708948,
      "fos_buckling": 1.4069944040149696,
      "fos_yielding": 1.8270360869974906,
      "deflection": 0.0044464364043526414,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.353)"
      },
      "parent_node_id": "node_3135",
      "improvement_over_parent": null
    },
    "node_3137": {
      "node_id": "node_3137",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1605386448656,
      "fos_buckling": 1.5226209012474246,
      "fos_yielding": 2.012005637358074,
      "deflection": 0.00404154279912979,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.112)"
      },
      "parent_node_id": "node_3136",
      "improvement_over_parent": null
    },
    "node_3138": {
      "node_id": "node_3138",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3137",
      "improvement_over_parent": null
    },
    "node_3139": {
      "node_id": "node_3139",
      "content": "INITIAL DESIGN (Trace 451)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 177.64 kg\n  Factor of Safety: 0.71\n  Max Deflection: 9.09e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.64069498174402,
      "fos_buckling": 0.7121983767228268,
      "fos_yielding": 1.483847512409704,
      "deflection": 0.009086251737706191,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3140": {
      "node_id": "node_3140",
      "content": "MODIFICATION: Increase 7 thickness by 65%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0038)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 185.75 kg\n  Factor of Safety: 0.71\n  Max Deflection: 9.09e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 185.753196232309,
      "fos_buckling": 0.7137718065732753,
      "fos_yielding": 1.484919266026184,
      "deflection": 0.009085941902056019,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.653)"
      },
      "parent_node_id": "node_3139",
      "improvement_over_parent": null
    },
    "node_3141": {
      "node_id": "node_3141",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 236.66 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.14e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.6604792751956,
      "fos_buckling": 0.8806452450750857,
      "fos_yielding": 1.889140805351052,
      "deflection": 0.007143540615693238,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.295)"
      },
      "parent_node_id": "node_3140",
      "improvement_over_parent": null
    },
    "node_3142": {
      "node_id": "node_3142",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n\nPerformance:\n  Mass: 240.94 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.90e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 240.9434309386858,
      "fos_buckling": 1.295300160793964,
      "fos_yielding": 1.6554395266359252,
      "deflection": 0.004902821917978026,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002669)"
      },
      "parent_node_id": "node_3141",
      "improvement_over_parent": null
    },
    "node_3143": {
      "node_id": "node_3143",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.38 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.380865774617,
      "fos_buckling": 1.5234014907345128,
      "fos_yielding": 2.013341783339749,
      "deflection": 0.004038776050634451,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.239)"
      },
      "parent_node_id": "node_3142",
      "improvement_over_parent": null
    },
    "node_3144": {
      "node_id": "node_3144",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3143",
      "improvement_over_parent": null
    },
    "node_3145": {
      "node_id": "node_3145",
      "content": "INITIAL DESIGN (Trace 452)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3146": {
      "node_id": "node_3146",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 184.54 kg\n  Factor of Safety: 0.03\n  Max Deflection: 5.63e+14 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.53888805363619,
      "fos_buckling": 0.030935757134626134,
      "fos_yielding": 0.11256456814882607,
      "deflection": 562782178327453.3,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_3145",
      "improvement_over_parent": null
    },
    "node_3147": {
      "node_id": "node_3147",
      "content": "MODIFICATION: Increase 5 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 186.14 kg\n  Factor of Safety: 1.86\n  Max Deflection: 1.95e+13 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 186.13946721375544,
      "fos_buckling": 1.862202309736621,
      "fos_yielding": 2.288071782940979,
      "deflection": 19507490168048.18,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.486)"
      },
      "parent_node_id": "node_3146",
      "improvement_over_parent": null
    },
    "node_3148": {
      "node_id": "node_3148",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 219.05 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.83e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.05200384537244,
      "fos_buckling": 0.5896569359821663,
      "fos_yielding": 1.9026842018952594,
      "deflection": 0.00783319590251901,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_3147",
      "improvement_over_parent": null
    },
    "node_3149": {
      "node_id": "node_3149",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 262.25 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.2500617828247,
      "fos_buckling": 1.072610044753053,
      "fos_yielding": 2.288071782940979,
      "deflection": 0.004851293144725467,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_3148",
      "improvement_over_parent": null
    },
    "node_3150": {
      "node_id": "node_3150",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22860783190106,
      "fos_buckling": 1.5228740857486263,
      "fos_yielding": 2.0124565300294788,
      "deflection": 0.004040688633499489,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_3149",
      "improvement_over_parent": null
    },
    "node_3151": {
      "node_id": "node_3151",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3150",
      "improvement_over_parent": null
    },
    "node_3152": {
      "node_id": "node_3152",
      "content": "INITIAL DESIGN (Trace 453)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 221.33 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.18e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.32582999375535,
      "fos_buckling": 0.9116026579963553,
      "fos_yielding": 1.7973411581448517,
      "deflection": 0.00618072267419599,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3153": {
      "node_id": "node_3153",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n\nPerformance:\n  Mass: 244.23 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.83e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.23154349811657,
      "fos_buckling": 1.307893903926594,
      "fos_yielding": 1.809747018915708,
      "deflection": 0.0048296374132285255,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004383)"
      },
      "parent_node_id": "node_3152",
      "improvement_over_parent": null
    },
    "node_3154": {
      "node_id": "node_3154",
      "content": "MODIFICATION: Increase 9 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0083)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n\nPerformance:\n  Mass: 262.35 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.53e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.3497713007188,
      "fos_buckling": 1.4154630521765548,
      "fos_yielding": 1.8422755718330914,
      "deflection": 0.004533704876725247,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.522)"
      },
      "parent_node_id": "node_3153",
      "improvement_over_parent": null
    },
    "node_3155": {
      "node_id": "node_3155",
      "content": "MODIFICATION: Increase 0 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0083)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n\nPerformance:\n  Mass: 268.52 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.38e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.52135213507967,
      "fos_buckling": 1.3886574667325013,
      "fos_yielding": 1.8410440054437582,
      "deflection": 0.004376634115317496,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.280)"
      },
      "parent_node_id": "node_3154",
      "improvement_over_parent": null
    },
    "node_3156": {
      "node_id": "node_3156",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0095)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 303.36 kg\n  Factor of Safety: 1.54\n  Max Deflection: 3.88e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 303.360644096897,
      "fos_buckling": 1.535158876373186,
      "fos_yielding": 2.080059001560258,
      "deflection": 0.003880824465042613,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_3155",
      "improvement_over_parent": null
    },
    "node_3157": {
      "node_id": "node_3157",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3156",
      "improvement_over_parent": null
    },
    "node_3158": {
      "node_id": "node_3158",
      "content": "INITIAL DESIGN (Trace 454)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0018)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 172.81 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.87e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 172.8056666650502,
      "fos_buckling": 0.8943530188666599,
      "fos_yielding": 1.2918412163830257,
      "deflection": 0.006874074327935236,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3159": {
      "node_id": "node_3159",
      "content": "MODIFICATION: Increase 0 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0018)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 178.83 kg\n  Factor of Safety: 0.89\n  Max Deflection: 6.55e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.83095237472727,
      "fos_buckling": 0.8866875005569667,
      "fos_yielding": 1.2906896431622499,
      "deflection": 0.006545279788206393,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.414)"
      },
      "parent_node_id": "node_3158",
      "improvement_over_parent": null
    },
    "node_3160": {
      "node_id": "node_3160",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 198.37 kg\n  Factor of Safety: 0.98\n  Max Deflection: 5.91e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.36651085420894,
      "fos_buckling": 0.9762958743702809,
      "fos_yielding": 1.4307958168868031,
      "deflection": 0.005907373983449065,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.116)"
      },
      "parent_node_id": "node_3159",
      "improvement_over_parent": null
    },
    "node_3161": {
      "node_id": "node_3161",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 223.55 kg\n  Factor of Safety: 1.09\n  Max Deflection: 5.25e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.5475991391228,
      "fos_buckling": 1.0896989324124686,
      "fos_yielding": 1.6111194852240263,
      "deflection": 0.005249597324838321,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.136)"
      },
      "parent_node_id": "node_3160",
      "improvement_over_parent": null
    },
    "node_3162": {
      "node_id": "node_3162",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n\nPerformance:\n  Mass: 247.33 kg\n  Factor of Safety: 1.19\n  Max Deflection: 4.75e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 247.3311456812645,
      "fos_buckling": 1.1946358659869412,
      "fos_yielding": 1.7811495233342707,
      "deflection": 0.004751320441785931,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.115)"
      },
      "parent_node_id": "node_3161",
      "improvement_over_parent": null
    },
    "node_3163": {
      "node_id": "node_3163",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 284.33 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 284.3316056087958,
      "fos_buckling": 1.3536924420911454,
      "fos_yielding": 2.045102940742023,
      "deflection": 0.004141858198554975,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.164)"
      },
      "parent_node_id": "node_3162",
      "improvement_over_parent": null
    },
    "node_3164": {
      "node_id": "node_3164",
      "content": "MODIFICATION: Increase 3 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.30 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.29523510545033,
      "fos_buckling": 1.5232321704741438,
      "fos_yielding": 2.013001708530472,
      "deflection": 0.004039806420244688,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.637)"
      },
      "parent_node_id": "node_3163",
      "improvement_over_parent": null
    },
    "node_3165": {
      "node_id": "node_3165",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3164",
      "improvement_over_parent": null
    },
    "node_3166": {
      "node_id": "node_3166",
      "content": "INITIAL DESIGN (Trace 455)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 170.43 kg\n  Factor of Safety: 0.79\n  Max Deflection: 8.28e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 170.42645748904073,
      "fos_buckling": 0.7871064520014308,
      "fos_yielding": 1.398333448839408,
      "deflection": 0.008276682728797814,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3167": {
      "node_id": "node_3167",
      "content": "MODIFICATION: Increase 4 thickness by 49%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0039)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0034)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 171.96 kg\n  Factor of Safety: 0.79\n  Max Deflection: 8.18e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.95976047219116,
      "fos_buckling": 0.7871064520014309,
      "fos_yielding": 1.5820469270585344,
      "deflection": 0.00817978065988515,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.488)"
      },
      "parent_node_id": "node_3166",
      "improvement_over_parent": null
    },
    "node_3168": {
      "node_id": "node_3168",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0029)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 209.99 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.70e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.99281020742487,
      "fos_buckling": 0.9333647115365762,
      "fos_yielding": 1.9303410743851597,
      "deflection": 0.006702937293099818,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.238)"
      },
      "parent_node_id": "node_3167",
      "improvement_over_parent": null
    },
    "node_3169": {
      "node_id": "node_3169",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 249.32 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.65e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.32351031375995,
      "fos_buckling": 1.0742184112895317,
      "fos_yielding": 2.289832459146094,
      "deflection": 0.005649071318949239,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.205)"
      },
      "parent_node_id": "node_3168",
      "improvement_over_parent": null
    },
    "node_3170": {
      "node_id": "node_3170",
      "content": "MODIFICATION: Increase 1 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.47 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.4707107170639,
      "fos_buckling": 1.0732506487920825,
      "fos_yielding": 2.289832459146094,
      "deflection": 0.0048467969249739,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.656)"
      },
      "parent_node_id": "node_3169",
      "improvement_over_parent": null
    },
    "node_3171": {
      "node_id": "node_3171",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.45 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4492567661403,
      "fos_buckling": 1.5234864040508072,
      "fos_yielding": 2.0141124073008565,
      "deflection": 0.004037432941743583,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_3170",
      "improvement_over_parent": null
    },
    "node_3172": {
      "node_id": "node_3172",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3171",
      "improvement_over_parent": null
    },
    "node_3173": {
      "node_id": "node_3173",
      "content": "INITIAL DESIGN (Trace 456)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 212.88 kg\n  Factor of Safety: 0.41\n  Max Deflection: 2.29e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.87625109044717,
      "fos_buckling": 0.41388436198857537,
      "fos_yielding": 1.6889506393076918,
      "deflection": 0.022888770892467533,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3174": {
      "node_id": "node_3174",
      "content": "MODIFICATION: Increase 7 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 217.12 kg\n  Factor of Safety: 0.48\n  Max Deflection: 2.24e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.11802520214889,
      "fos_buckling": 0.47803389510800837,
      "fos_yielding": 1.6886886481779786,
      "deflection": 0.022433467649816005,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.198)"
      },
      "parent_node_id": "node_3173",
      "improvement_over_parent": null
    },
    "node_3175": {
      "node_id": "node_3175",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n\nPerformance:\n  Mass: 249.07 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.96e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 249.07127494736224,
      "fos_buckling": 0.8217658921206231,
      "fos_yielding": 2.0576531136704,
      "deflection": 0.006961046116420497,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004449)"
      },
      "parent_node_id": "node_3174",
      "improvement_over_parent": null
    },
    "node_3176": {
      "node_id": "node_3176",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n\nPerformance:\n  Mass: 280.88 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.18e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 280.88266122117255,
      "fos_buckling": 0.9118734138239538,
      "fos_yielding": 2.3174127342486424,
      "deflection": 0.006176929701247995,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.140)"
      },
      "parent_node_id": "node_3175",
      "improvement_over_parent": null
    },
    "node_3177": {
      "node_id": "node_3177",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 286.10 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.17e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.09649125498663,
      "fos_buckling": 1.3681754845076322,
      "fos_yielding": 2.0134749146125657,
      "deflection": 0.0041655666272066025,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3176",
      "improvement_over_parent": null
    },
    "node_3178": {
      "node_id": "node_3178",
      "content": "MODIFICATION: Increase 7 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0063)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 292.02 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.13e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.02042997438383,
      "fos_buckling": 1.3661026327483317,
      "fos_yielding": 2.0010663305839747,
      "deflection": 0.0041269893955028815,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.215)"
      },
      "parent_node_id": "node_3177",
      "improvement_over_parent": null
    },
    "node_3179": {
      "node_id": "node_3179",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3178",
      "improvement_over_parent": null
    },
    "node_3180": {
      "node_id": "node_3180",
      "content": "INITIAL DESIGN (Trace 457)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 228.27 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.46e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.2715460807978,
      "fos_buckling": 0.9724558609044344,
      "fos_yielding": 2.0293227692697626,
      "deflection": 0.00546091717086019,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3181": {
      "node_id": "node_3181",
      "content": "MODIFICATION: Increase 3 thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 232.46 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.46e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 232.46432502958623,
      "fos_buckling": 0.9721759186329705,
      "fos_yielding": 2.028793890309572,
      "deflection": 0.005462455980529019,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.261)"
      },
      "parent_node_id": "node_3180",
      "improvement_over_parent": null
    },
    "node_3182": {
      "node_id": "node_3182",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 259.93 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.55e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.92690701752707,
      "fos_buckling": 1.380174387981145,
      "fos_yielding": 1.7853216474876497,
      "deflection": 0.004549503391895584,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004578)"
      },
      "parent_node_id": "node_3181",
      "improvement_over_parent": null
    },
    "node_3183": {
      "node_id": "node_3183",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.05 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.04740337028676,
      "fos_buckling": 1.5221245099528595,
      "fos_yielding": 2.0113089164080655,
      "deflection": 0.004043069692393324,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.140)"
      },
      "parent_node_id": "node_3182",
      "improvement_over_parent": null
    },
    "node_3184": {
      "node_id": "node_3184",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3183",
      "improvement_over_parent": null
    },
    "node_3185": {
      "node_id": "node_3185",
      "content": "INITIAL DESIGN (Trace 458)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0017)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 137.10 kg\n  Factor of Safety: 0.66\n  Max Deflection: 9.75e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 137.0990172318985,
      "fos_buckling": 0.6568109790196864,
      "fos_yielding": 1.38298993404959,
      "deflection": 0.009748657802730508,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3186": {
      "node_id": "node_3186",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 179.61 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.47e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.61082799884525,
      "fos_buckling": 0.8307196748586133,
      "fos_yielding": 1.810453948210999,
      "deflection": 0.007468302108221716,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_3185",
      "improvement_over_parent": null
    },
    "node_3187": {
      "node_id": "node_3187",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n\nPerformance:\n  Mass: 200.09 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.0903874976411,
      "fos_buckling": 0.8835730900805131,
      "fos_yielding": 1.810453948210999,
      "deflection": 0.006112444385156532,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003884)"
      },
      "parent_node_id": "node_3186",
      "improvement_over_parent": null
    },
    "node_3188": {
      "node_id": "node_3188",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 253.08 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.0773806136998,
      "fos_buckling": 1.0727321509057786,
      "fos_yielding": 2.287977459515964,
      "deflection": 0.004851271459672853,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.290)"
      },
      "parent_node_id": "node_3187",
      "improvement_over_parent": null
    },
    "node_3189": {
      "node_id": "node_3189",
      "content": "MODIFICATION: Increase 3 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0063)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 256.94 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.80e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.94149406063195,
      "fos_buckling": 1.072732150905779,
      "fos_yielding": 2.287977459515964,
      "deflection": 0.004797723001797291,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.645)"
      },
      "parent_node_id": "node_3188",
      "improvement_over_parent": null
    },
    "node_3190": {
      "node_id": "node_3190",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0063)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 287.92 kg\n  Factor of Safety: 1.35\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 287.92004010970834,
      "fos_buckling": 1.3538177328132333,
      "fos_yielding": 2.044264746175287,
      "deflection": 0.00409534903201432,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_3189",
      "improvement_over_parent": null
    },
    "node_3191": {
      "node_id": "node_3191",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3190",
      "improvement_over_parent": null
    },
    "node_3192": {
      "node_id": "node_3192",
      "content": "INITIAL DESIGN (Trace 459)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0023)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0016)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 124.14 kg\n  Factor of Safety: 0.71\n  Max Deflection: 9.41e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 124.14105378089184,
      "fos_buckling": 0.7129825700839092,
      "fos_yielding": 0.8740428432013818,
      "deflection": 0.00940704018285591,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3193": {
      "node_id": "node_3193",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 153.48 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.62e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 153.47623774151845,
      "fos_buckling": 0.865433105784913,
      "fos_yielding": 1.079713180240698,
      "deflection": 0.007622272107015642,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.247)"
      },
      "parent_node_id": "node_3192",
      "improvement_over_parent": null
    },
    "node_3194": {
      "node_id": "node_3194",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0023)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0030)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 174.33 kg\n  Factor of Safety: 0.97\n  Max Deflection: 6.72e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.32777653742522,
      "fos_buckling": 0.9701092327641581,
      "fos_yielding": 1.2256977497026342,
      "deflection": 0.0067188767384940016,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.143)"
      },
      "parent_node_id": "node_3193",
      "improvement_over_parent": null
    },
    "node_3195": {
      "node_id": "node_3195",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 222.25 kg\n  Factor of Safety: 1.20\n  Max Deflection: 5.29e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 222.2487240106928,
      "fos_buckling": 1.1991373823714326,
      "fos_yielding": 1.5605397100539506,
      "deflection": 0.005285159481410733,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.294)"
      },
      "parent_node_id": "node_3194",
      "improvement_over_parent": null
    },
    "node_3196": {
      "node_id": "node_3196",
      "content": "MODIFICATION: Increase 3 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 225.60 kg\n  Factor of Safety: 1.23\n  Max Deflection: 5.23e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.60230237049046,
      "fos_buckling": 1.225106495314714,
      "fos_yielding": 1.550639359677116,
      "deflection": 0.005231372573658024,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.233)"
      },
      "parent_node_id": "node_3195",
      "improvement_over_parent": null
    },
    "node_3197": {
      "node_id": "node_3197",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0044)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0030)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0047)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 265.05 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.46e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.05431368141103,
      "fos_buckling": 1.4026782710705017,
      "fos_yielding": 1.8201871052348872,
      "deflection": 0.004462921150570258,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.190)"
      },
      "parent_node_id": "node_3196",
      "improvement_over_parent": null
    },
    "node_3198": {
      "node_id": "node_3198",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2725094027022,
      "fos_buckling": 1.5231022877456997,
      "fos_yielding": 2.012688469146927,
      "deflection": 0.004040107784588131,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.117)"
      },
      "parent_node_id": "node_3197",
      "improvement_over_parent": null
    },
    "node_3199": {
      "node_id": "node_3199",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3198",
      "improvement_over_parent": null
    },
    "node_3200": {
      "node_id": "node_3200",
      "content": "INITIAL DESIGN (Trace 460)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0018)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0013)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 105.71 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.19e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 105.7131369525215,
      "fos_buckling": 0.5172360919316259,
      "fos_yielding": 0.9919524849007255,
      "deflection": 0.01185069000846079,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3201": {
      "node_id": "node_3201",
      "content": "MODIFICATION: Increase 0 thickness by 35%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0013)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 109.39 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.14e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 109.39487857420617,
      "fos_buckling": 0.5171042774428509,
      "fos_yielding": 0.9919524849007255,
      "deflection": 0.01139773026599606,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.346)"
      },
      "parent_node_id": "node_3200",
      "improvement_over_parent": null
    },
    "node_3202": {
      "node_id": "node_3202",
      "content": "MODIFICATION: Increase 2 thickness by 61%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0021)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n\nPerformance:\n  Mass: 113.55 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 113.55016689134585,
      "fos_buckling": 0.5169555896142274,
      "fos_yielding": 0.9919524849007255,
      "deflection": 0.011099287223503505,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.610)"
      },
      "parent_node_id": "node_3201",
      "improvement_over_parent": null
    },
    "node_3203": {
      "node_id": "node_3203",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 148.83 kg\n  Factor of Safety: 0.66\n  Max Deflection: 8.49e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 148.8267986712283,
      "fos_buckling": 0.6611050860232986,
      "fos_yielding": 1.2997481578316143,
      "deflection": 0.008487411353470075,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.326)"
      },
      "parent_node_id": "node_3202",
      "improvement_over_parent": null
    },
    "node_3204": {
      "node_id": "node_3204",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0029)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n\nPerformance:\n  Mass: 166.41 kg\n  Factor of Safety: 0.94\n  Max Deflection: 7.07e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 166.40844716404902,
      "fos_buckling": 0.938407787293255,
      "fos_yielding": 1.1453933728869197,
      "deflection": 0.007067799432180573,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002846)"
      },
      "parent_node_id": "node_3203",
      "improvement_over_parent": null
    },
    "node_3205": {
      "node_id": "node_3205",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0044)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0037)]\n\nPerformance:\n  Mass: 213.09 kg\n  Factor of Safety: 1.17\n  Max Deflection: 5.53e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.08969060830563,
      "fos_buckling": 1.1665475882920928,
      "fos_yielding": 1.4651556618602743,
      "deflection": 0.005534498125312832,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_3204",
      "improvement_over_parent": null
    },
    "node_3206": {
      "node_id": "node_3206",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 260.64 kg\n  Factor of Safety: 1.38\n  Max Deflection: 4.54e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.6422305672877,
      "fos_buckling": 1.3833653328917472,
      "fos_yielding": 1.790193902825806,
      "deflection": 0.004537281745721312,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.242)"
      },
      "parent_node_id": "node_3205",
      "improvement_over_parent": null
    },
    "node_3207": {
      "node_id": "node_3207",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.37 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3746908749968,
      "fos_buckling": 1.5235388643092997,
      "fos_yielding": 2.0135268215564963,
      "deflection": 0.004038702565577523,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_3206",
      "improvement_over_parent": null
    },
    "node_3208": {
      "node_id": "node_3208",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3207",
      "improvement_over_parent": null
    },
    "node_3209": {
      "node_id": "node_3209",
      "content": "INITIAL DESIGN (Trace 461)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0045)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 253.09 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.78e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.09180342050726,
      "fos_buckling": 1.2636400496372469,
      "fos_yielding": 1.7762071697132573,
      "deflection": 0.004780584838766447,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3210": {
      "node_id": "node_3210",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 281.97 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.30e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.974363414155,
      "fos_buckling": 1.3890124237328079,
      "fos_yielding": 1.9772750239821342,
      "deflection": 0.004296780899327015,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.125)"
      },
      "parent_node_id": "node_3209",
      "improvement_over_parent": null
    },
    "node_3211": {
      "node_id": "node_3211",
      "content": "MODIFICATION: Increase 1 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 291.72 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.715026318707,
      "fos_buckling": 1.3859180581425405,
      "fos_yielding": 2.0119734667624085,
      "deflection": 0.004078669550775514,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.422)"
      },
      "parent_node_id": "node_3210",
      "improvement_over_parent": null
    },
    "node_3212": {
      "node_id": "node_3212",
      "content": "MODIFICATION: Increase 4 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.23531356107895,
      "fos_buckling": 1.5230130157647574,
      "fos_yielding": 2.0125487059884435,
      "deflection": 0.004040603926643027,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.302)"
      },
      "parent_node_id": "node_3211",
      "improvement_over_parent": null
    },
    "node_3213": {
      "node_id": "node_3213",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3212",
      "improvement_over_parent": null
    },
    "node_3214": {
      "node_id": "node_3214",
      "content": "INITIAL DESIGN (Trace 462)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 136.61 kg\n  Factor of Safety: 0.13\n  Max Deflection: 6.09e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 136.61251202429588,
      "fos_buckling": 0.12606612344643353,
      "fos_yielding": 0.28132684281909387,
      "deflection": 60946228620200.89,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3215": {
      "node_id": "node_3215",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n\nPerformance:\n  Mass: 150.11 kg\n  Factor of Safety: 0.41\n  Max Deflection: 1.01e+14 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 150.11475072187346,
      "fos_buckling": 0.4115798484635674,
      "fos_yielding": 0.14066342140954693,
      "deflection": 101388048161730.77,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002583)"
      },
      "parent_node_id": "node_3214",
      "improvement_over_parent": null
    },
    "node_3216": {
      "node_id": "node_3216",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n\nPerformance:\n  Mass: 180.73 kg\n  Factor of Safety: 0.76\n  Max Deflection: 7.11e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.73285796555527,
      "fos_buckling": 0.755310320710342,
      "fos_yielding": 1.4312507797170246,
      "deflection": 0.007113568553321449,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004251)"
      },
      "parent_node_id": "node_3215",
      "improvement_over_parent": null
    },
    "node_3217": {
      "node_id": "node_3217",
      "content": "MODIFICATION: Increase 3 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n\nPerformance:\n  Mass: 182.11 kg\n  Factor of Safety: 0.76\n  Max Deflection: 7.11e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 182.10823589987612,
      "fos_buckling": 0.755310320710342,
      "fos_yielding": 1.4312507797170246,
      "deflection": 0.007113568553321449,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.299)"
      },
      "parent_node_id": "node_3216",
      "improvement_over_parent": null
    },
    "node_3218": {
      "node_id": "node_3218",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0041)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n\nPerformance:\n  Mass: 212.21 kg\n  Factor of Safety: 0.86\n  Max Deflection: 6.12e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.21141065366106,
      "fos_buckling": 0.8607525500735275,
      "fos_yielding": 1.6664248999642186,
      "deflection": 0.00611548196767174,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.178)"
      },
      "parent_node_id": "node_3217",
      "improvement_over_parent": null
    },
    "node_3219": {
      "node_id": "node_3219",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0041)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 239.38 kg\n  Factor of Safety: 1.27\n  Max Deflection: 4.90e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.38166351410808,
      "fos_buckling": 1.2656958966734977,
      "fos_yielding": 1.6777356562026684,
      "deflection": 0.004904451051167629,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004369)"
      },
      "parent_node_id": "node_3218",
      "improvement_over_parent": null
    },
    "node_3220": {
      "node_id": "node_3220",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0050)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M9: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 289.98 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.9813175275773,
      "fos_buckling": 1.4827643975584064,
      "fos_yielding": 2.0296923514625953,
      "deflection": 0.004060657829128454,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.232)"
      },
      "parent_node_id": "node_3219",
      "improvement_over_parent": null
    },
    "node_3221": {
      "node_id": "node_3221",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3220",
      "improvement_over_parent": null
    },
    "node_3222": {
      "node_id": "node_3222",
      "content": "INITIAL DESIGN (Trace 463)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3223": {
      "node_id": "node_3223",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n\nPerformance:\n  Mass: 152.82 kg\n  Factor of Safety: 0.60\n  Max Deflection: 4.26e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.82255586018843,
      "fos_buckling": 0.6014381725653192,
      "fos_yielding": 1.1130050254065067,
      "deflection": 42611070637783.59,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003487)"
      },
      "parent_node_id": "node_3222",
      "improvement_over_parent": null
    },
    "node_3224": {
      "node_id": "node_3224",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n\nPerformance:\n  Mass: 180.41 kg\n  Factor of Safety: 0.44\n  Max Deflection: 9.70e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.40754862886564,
      "fos_buckling": 0.4443601680243391,
      "fos_yielding": 1.5985080528513527,
      "deflection": 0.009697440196529171,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004441)"
      },
      "parent_node_id": "node_3223",
      "improvement_over_parent": null
    },
    "node_3225": {
      "node_id": "node_3225",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 215.29 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.14e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.29008297344038,
      "fos_buckling": 0.5175746559620291,
      "fos_yielding": 1.9033615564333846,
      "deflection": 0.008140074981351069,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.212)"
      },
      "parent_node_id": "node_3224",
      "improvement_over_parent": null
    },
    "node_3226": {
      "node_id": "node_3226",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 246.27 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.50e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.26862902251673,
      "fos_buckling": 0.5164747409716505,
      "fos_yielding": 1.90120841706659,
      "deflection": 0.007501652352159577,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_3225",
      "improvement_over_parent": null
    },
    "node_3227": {
      "node_id": "node_3227",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 289.47 kg\n  Factor of Safety: 1.50\n  Max Deflection: 4.08e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.46668695996897,
      "fos_buckling": 1.4963552602855463,
      "fos_yielding": 2.011830383828403,
      "deflection": 0.004077724893268193,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_3226",
      "improvement_over_parent": null
    },
    "node_3228": {
      "node_id": "node_3228",
      "content": "MODIFICATION: Increase 2 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0058)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.51 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 293.5126277306124,
      "fos_buckling": 1.4946801682900934,
      "fos_yielding": 2.0024742415312393,
      "deflection": 0.004048239974825642,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.186)"
      },
      "parent_node_id": "node_3227",
      "improvement_over_parent": null
    },
    "node_3229": {
      "node_id": "node_3229",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3228",
      "improvement_over_parent": null
    },
    "node_3230": {
      "node_id": "node_3230",
      "content": "INITIAL DESIGN (Trace 464)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 235.09 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.70e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.08952451311112,
      "fos_buckling": 0.8662894440699471,
      "fos_yielding": 1.9179666196055036,
      "deflection": 0.007696364878780161,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3231": {
      "node_id": "node_3231",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 275.88 kg\n  Factor of Safety: 0.99\n  Max Deflection: 6.56e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 275.8837678588506,
      "fos_buckling": 0.9891317774345554,
      "fos_yielding": 2.2478581156552098,
      "deflection": 0.006560145662411891,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.190)"
      },
      "parent_node_id": "node_3230",
      "improvement_over_parent": null
    },
    "node_3232": {
      "node_id": "node_3232",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 279.89 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.39e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 279.886765950465,
      "fos_buckling": 1.367520241263776,
      "fos_yielding": 1.9728108069914743,
      "deflection": 0.004393744177131303,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002482)"
      },
      "parent_node_id": "node_3231",
      "improvement_over_parent": null
    },
    "node_3233": {
      "node_id": "node_3233",
      "content": "MODIFICATION: Increase 5 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0061)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 282.79 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.34e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.7932682928395,
      "fos_buckling": 1.3394188287709845,
      "fos_yielding": 2.5334641962287567,
      "deflection": 0.004343286643903561,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.332)"
      },
      "parent_node_id": "node_3232",
      "improvement_over_parent": null
    },
    "node_3234": {
      "node_id": "node_3234",
      "content": "MODIFICATION: Increase 1 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0061)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n\nPerformance:\n  Mass: 294.66 kg\n  Factor of Safety: 1.46\n  Max Deflection: 4.06e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.6587461109452,
      "fos_buckling": 1.4562734480502892,
      "fos_yielding": 2.5904752830944306,
      "deflection": 0.004056257097391406,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.562)"
      },
      "parent_node_id": "node_3233",
      "improvement_over_parent": null
    },
    "node_3235": {
      "node_id": "node_3235",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3234",
      "improvement_over_parent": null
    },
    "node_3236": {
      "node_id": "node_3236",
      "content": "INITIAL DESIGN (Trace 465)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0021)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0022)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0014)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0018)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0014)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0012)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0017)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0023)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0020)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0019)]\n\nPerformance:\n  Mass: 94.81 kg\n  Factor of Safety: 0.23\n  Max Deflection: 1.92e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 94.8073148922612,
      "fos_buckling": 0.22924104444033241,
      "fos_yielding": 0.6196363036332698,
      "deflection": 0.019168876903717446,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3237": {
      "node_id": "node_3237",
      "content": "MODIFICATION: Increase all_members thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0016)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0021)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0020)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0027)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0023)]\n\nPerformance:\n  Mass: 111.97 kg\n  Factor of Safety: 0.27\n  Max Deflection: 1.62e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 111.97049434634998,
      "fos_buckling": 0.2672828735671065,
      "fos_yielding": 0.7313123784746886,
      "deflection": 0.01624781121916972,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.188)"
      },
      "parent_node_id": "node_3236",
      "improvement_over_parent": null
    },
    "node_3238": {
      "node_id": "node_3238",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0031)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0019)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0033)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0028)]\n\nPerformance:\n  Mass: 133.15 kg\n  Factor of Safety: 0.31\n  Max Deflection: 1.37e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 133.15046716062852,
      "fos_buckling": 0.312780675943784,
      "fos_yielding": 0.8689112224017734,
      "deflection": 0.013681197077202131,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.198)"
      },
      "parent_node_id": "node_3237",
      "improvement_over_parent": null
    },
    "node_3239": {
      "node_id": "node_3239",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 171.87 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.06e-02 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.87066740785724,
      "fos_buckling": 0.3918479431548776,
      "fos_yielding": 1.1198474739260884,
      "deflection": 0.010624449694494421,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.309)"
      },
      "parent_node_id": "node_3238",
      "improvement_over_parent": null
    },
    "node_3240": {
      "node_id": "node_3240",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0025)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 203.53 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.76e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.5345448890344,
      "fos_buckling": 1.0707353124602481,
      "fos_yielding": 1.431622651138024,
      "deflection": 0.005763468516551233,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004328)"
      },
      "parent_node_id": "node_3239",
      "improvement_over_parent": null
    },
    "node_3241": {
      "node_id": "node_3241",
      "content": "MODIFICATION: Increase all_members thickness by 11%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 225.38 kg\n  Factor of Safety: 1.17\n  Max Deflection: 5.21e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.37667646175578,
      "fos_buckling": 1.173774780637356,
      "fos_yielding": 1.584257804274068,
      "deflection": 0.005211565967905998,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.115)"
      },
      "parent_node_id": "node_3240",
      "improvement_over_parent": null
    },
    "node_3242": {
      "node_id": "node_3242",
      "content": "MODIFICATION: Increase 2 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 230.62 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.12e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.62351321253277,
      "fos_buckling": 1.2481558848650642,
      "fos_yielding": 1.58506096333877,
      "deflection": 0.005118932959180316,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.372)"
      },
      "parent_node_id": "node_3241",
      "improvement_over_parent": null
    },
    "node_3243": {
      "node_id": "node_3243",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.43 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.4344977810207,
      "fos_buckling": 1.5236070976824763,
      "fos_yielding": 2.0139028597229607,
      "deflection": 0.00403788901246988,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_3242",
      "improvement_over_parent": null
    },
    "node_3244": {
      "node_id": "node_3244",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3243",
      "improvement_over_parent": null
    },
    "node_3245": {
      "node_id": "node_3245",
      "content": "INITIAL DESIGN (Trace 466)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0041)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0024)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 195.53 kg\n  Factor of Safety: 0.69\n  Max Deflection: 8.65e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.52663999797184,
      "fos_buckling": 0.6887940489068227,
      "fos_yielding": 1.6296835520194963,
      "deflection": 0.008652217315507534,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3246": {
      "node_id": "node_3246",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 241.17 kg\n  Factor of Safety: 0.83\n  Max Deflection: 7.02e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.17485247878983,
      "fos_buckling": 0.8300623976125284,
      "fos_yielding": 2.0064960344515876,
      "deflection": 0.007023358799243952,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.252)"
      },
      "parent_node_id": "node_3245",
      "improvement_over_parent": null
    },
    "node_3247": {
      "node_id": "node_3247",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 245.77 kg\n  Factor of Safety: 1.17\n  Max Deflection: 4.83e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 245.77004611845052,
      "fos_buckling": 1.1710981744400883,
      "fos_yielding": 1.7751685735754472,
      "deflection": 0.004826622685879139,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002880)"
      },
      "parent_node_id": "node_3246",
      "improvement_over_parent": null
    },
    "node_3248": {
      "node_id": "node_3248",
      "content": "MODIFICATION: Increase 10 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0035)]\n\nPerformance:\n  Mass: 246.70 kg\n  Factor of Safety: 1.17\n  Max Deflection: 4.79e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.70075854643915,
      "fos_buckling": 1.171744304769968,
      "fos_yielding": 1.7717598390397902,
      "deflection": 0.0047908067395033066,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(10, thickness, 1.224)"
      },
      "parent_node_id": "node_3247",
      "improvement_over_parent": null
    },
    "node_3249": {
      "node_id": "node_3249",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0040)]\n\nPerformance:\n  Mass: 280.06 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.23e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 280.0613838467757,
      "fos_buckling": 1.3110420274839614,
      "fos_yielding": 2.009032809518729,
      "deflection": 0.004227897284441285,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.148)"
      },
      "parent_node_id": "node_3248",
      "improvement_over_parent": null
    },
    "node_3250": {
      "node_id": "node_3250",
      "content": "MODIFICATION: Increase 3 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0040)]\n\nPerformance:\n  Mass: 286.72 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.7157900222832,
      "fos_buckling": 1.3687530443500602,
      "fos_yielding": 1.9862784819956976,
      "deflection": 0.004143863252606562,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.412)"
      },
      "parent_node_id": "node_3249",
      "improvement_over_parent": null
    },
    "node_3251": {
      "node_id": "node_3251",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3250",
      "improvement_over_parent": null
    },
    "node_3252": {
      "node_id": "node_3252",
      "content": "INITIAL DESIGN (Trace 467)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0028)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0027)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0029)]\n\nPerformance:\n  Mass: 124.88 kg\n  Factor of Safety: 0.33\n  Max Deflection: 1.42e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 124.88107272804142,
      "fos_buckling": 0.3275178435783718,
      "fos_yielding": 0.9137241867734104,
      "deflection": 0.014245628070661666,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3253": {
      "node_id": "node_3253",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0041)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0044)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n\nPerformance:\n  Mass: 159.06 kg\n  Factor of Safety: 0.41\n  Max Deflection: 1.12e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 159.05554699778384,
      "fos_buckling": 0.40516503759036765,
      "fos_yielding": 1.1624497140370071,
      "deflection": 0.01120750073886145,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.292)"
      },
      "parent_node_id": "node_3252",
      "improvement_over_parent": null
    },
    "node_3254": {
      "node_id": "node_3254",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n\nPerformance:\n  Mass: 191.62 kg\n  Factor of Safety: 0.47\n  Max Deflection: 9.32e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 191.61614356093932,
      "fos_buckling": 0.47441597924121426,
      "fos_yielding": 1.3989046532387936,
      "deflection": 0.009320982501044704,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.222)"
      },
      "parent_node_id": "node_3253",
      "improvement_over_parent": null
    },
    "node_3255": {
      "node_id": "node_3255",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 215.68 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.29e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.68216469865027,
      "fos_buckling": 0.5226517966557328,
      "fos_yielding": 1.5733439901800343,
      "deflection": 0.008292711627050888,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.138)"
      },
      "parent_node_id": "node_3254",
      "improvement_over_parent": null
    },
    "node_3256": {
      "node_id": "node_3256",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 248.59 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.52e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 248.59470133026727,
      "fos_buckling": 0.5214719392299488,
      "fos_yielding": 1.572238109922898,
      "deflection": 0.007522197340012802,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_3255",
      "improvement_over_parent": null
    },
    "node_3257": {
      "node_id": "node_3257",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.18 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.17663249821317,
      "fos_buckling": 1.5228287284559712,
      "fos_yielding": 2.0119834307359246,
      "deflection": 0.00404139718223869,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_3256",
      "improvement_over_parent": null
    },
    "node_3258": {
      "node_id": "node_3258",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3257",
      "improvement_over_parent": null
    },
    "node_3259": {
      "node_id": "node_3259",
      "content": "INITIAL DESIGN (Trace 468)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 173.84 kg\n  Factor of Safety: 0.84\n  Max Deflection: 7.17e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 173.84022195184534,
      "fos_buckling": 0.8381080218723456,
      "fos_yielding": 1.699426039721891,
      "deflection": 0.007167208486722686,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3260": {
      "node_id": "node_3260",
      "content": "MODIFICATION: Increase 0 thickness by 47%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0042)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0035)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0045)]\n\nPerformance:\n  Mass: 181.58 kg\n  Factor of Safety: 0.84\n  Max Deflection: 6.87e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.58376593950297,
      "fos_buckling": 0.8376609212132753,
      "fos_yielding": 1.699426039721891,
      "deflection": 0.006866229315505483,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.473)"
      },
      "parent_node_id": "node_3259",
      "improvement_over_parent": null
    },
    "node_3261": {
      "node_id": "node_3261",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 210.44 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.94e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 210.44133054023035,
      "fos_buckling": 0.9487083977940026,
      "fos_yielding": 1.9676798802838604,
      "deflection": 0.00593564789498533,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_3260",
      "improvement_over_parent": null
    },
    "node_3262": {
      "node_id": "node_3262",
      "content": "MODIFICATION: Increase 8 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n\nPerformance:\n  Mass: 217.76 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.81e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.75551020186492,
      "fos_buckling": 0.9482315010303767,
      "fos_yielding": 1.9676798802838604,
      "deflection": 0.005808429670456337,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.377)"
      },
      "parent_node_id": "node_3261",
      "improvement_over_parent": null
    },
    "node_3263": {
      "node_id": "node_3263",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n\nPerformance:\n  Mass: 244.40 kg\n  Factor of Safety: 1.16\n  Max Deflection: 4.88e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.3979714027821,
      "fos_buckling": 1.1644730676604704,
      "fos_yielding": 1.733114676630532,
      "deflection": 0.00487851794789028,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004430)"
      },
      "parent_node_id": "node_3262",
      "improvement_over_parent": null
    },
    "node_3264": {
      "node_id": "node_3264",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 284.33 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.20e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 284.3335349648357,
      "fos_buckling": 1.328004660395112,
      "fos_yielding": 2.0136679281475742,
      "deflection": 0.004202222142815715,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.179)"
      },
      "parent_node_id": "node_3263",
      "improvement_over_parent": null
    },
    "node_3265": {
      "node_id": "node_3265",
      "content": "MODIFICATION: Increase 7 thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.16 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.163706263755,
      "fos_buckling": 1.522716093453604,
      "fos_yielding": 2.012032466275259,
      "deflection": 0.004041497377481025,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.282)"
      },
      "parent_node_id": "node_3264",
      "improvement_over_parent": null
    },
    "node_3266": {
      "node_id": "node_3266",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3265",
      "improvement_over_parent": null
    },
    "node_3267": {
      "node_id": "node_3267",
      "content": "INITIAL DESIGN (Trace 469)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3268": {
      "node_id": "node_3268",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 195.89 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.84e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 195.89068200051517,
      "fos_buckling": 0.8667400434581705,
      "fos_yielding": 1.602684588397859,
      "deflection": 0.007842357531652957,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004345)"
      },
      "parent_node_id": "node_3267",
      "improvement_over_parent": null
    },
    "node_3269": {
      "node_id": "node_3269",
      "content": "MODIFICATION: Increase 2 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n\nPerformance:\n  Mass: 201.31 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 201.3123732634106,
      "fos_buckling": 0.8664132797690254,
      "fos_yielding": 1.602684588397859,
      "deflection": 0.00784529872603579,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.368)"
      },
      "parent_node_id": "node_3268",
      "improvement_over_parent": null
    },
    "node_3270": {
      "node_id": "node_3270",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 226.76 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.84e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 226.76098447596127,
      "fos_buckling": 0.8515962987146812,
      "fos_yielding": 1.5865783735049803,
      "deflection": 0.007835226746077834,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004216)"
      },
      "parent_node_id": "node_3269",
      "improvement_over_parent": null
    },
    "node_3271": {
      "node_id": "node_3271",
      "content": "MODIFICATION: Increase 1 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 235.36 kg\n  Factor of Safety: 0.89\n  Max Deflection: 7.15e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.35817323342735,
      "fos_buckling": 0.8855753193493094,
      "fos_yielding": 1.6140356106893416,
      "deflection": 0.007145509513475186,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.458)"
      },
      "parent_node_id": "node_3270",
      "improvement_over_parent": null
    },
    "node_3272": {
      "node_id": "node_3272",
      "content": "MODIFICATION: Increase 5 thickness by 19%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 236.56 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.15e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.56365168288067,
      "fos_buckling": 0.8804249936690853,
      "fos_yielding": 1.8878391237579673,
      "deflection": 0.00714614644487277,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.186)"
      },
      "parent_node_id": "node_3271",
      "improvement_over_parent": null
    },
    "node_3273": {
      "node_id": "node_3273",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 288.05 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.0502855464492,
      "fos_buckling": 1.0367717025195127,
      "fos_yielding": 2.2953745823348903,
      "deflection": 0.0058788477089856015,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.239)"
      },
      "parent_node_id": "node_3272",
      "improvement_over_parent": null
    },
    "node_3274": {
      "node_id": "node_3274",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.26 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.26411558026325,
      "fos_buckling": 1.5231793913283918,
      "fos_yielding": 2.011984001606059,
      "deflection": 0.004040311061442196,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3273",
      "improvement_over_parent": null
    },
    "node_3275": {
      "node_id": "node_3275",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3274",
      "improvement_over_parent": null
    },
    "node_3276": {
      "node_id": "node_3276",
      "content": "INITIAL DESIGN (Trace 470)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 152.41 kg\n  Factor of Safety: 0.39\n  Max Deflection: 1.17e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.40979901570077,
      "fos_buckling": 0.3887704921854079,
      "fos_yielding": 1.0450262866902709,
      "deflection": 0.011713938746844666,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3277": {
      "node_id": "node_3277",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 197.30 kg\n  Factor of Safety: 0.49\n  Max Deflection: 9.07e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 197.30374040132028,
      "fos_buckling": 0.4864570117786162,
      "fos_yielding": 1.3553460794039947,
      "deflection": 0.009072348943990014,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.316)"
      },
      "parent_node_id": "node_3276",
      "improvement_over_parent": null
    },
    "node_3278": {
      "node_id": "node_3278",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0033)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 221.67 kg\n  Factor of Safety: 0.54\n  Max Deflection: 8.09e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.6746366216763,
      "fos_buckling": 0.5363278764652861,
      "fos_yielding": 1.5244098219222364,
      "deflection": 0.008086423487832773,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.134)"
      },
      "parent_node_id": "node_3277",
      "improvement_over_parent": null
    },
    "node_3279": {
      "node_id": "node_3279",
      "content": "MODIFICATION: Increase 6 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n\nPerformance:\n  Mass: 223.18 kg\n  Factor of Safety: 0.54\n  Max Deflection: 8.05e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.1804653548436,
      "fos_buckling": 0.5363278764652861,
      "fos_yielding": 1.6989000119902415,
      "deflection": 0.008047066424950289,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.221)"
      },
      "parent_node_id": "node_3278",
      "improvement_over_parent": null
    },
    "node_3280": {
      "node_id": "node_3280",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 250.39 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.18e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 250.39216235888262,
      "fos_buckling": 0.5890865524237923,
      "fos_yielding": 1.9032406630685677,
      "deflection": 0.007183814196020634,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.134)"
      },
      "parent_node_id": "node_3279",
      "improvement_over_parent": null
    },
    "node_3281": {
      "node_id": "node_3281",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.59 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.59022029633485,
      "fos_buckling": 1.524662406210253,
      "fos_yielding": 2.01569814645853,
      "deflection": 0.004035858333156825,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_3280",
      "improvement_over_parent": null
    },
    "node_3282": {
      "node_id": "node_3282",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3281",
      "improvement_over_parent": null
    },
    "node_3283": {
      "node_id": "node_3283",
      "content": "INITIAL DESIGN (Trace 471)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 238.03 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.35e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 238.02686824502524,
      "fos_buckling": 0.5889303541040088,
      "fos_yielding": 1.7298214167482717,
      "deflection": 0.007354193224250881,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3284": {
      "node_id": "node_3284",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 281.22 kg\n  Factor of Safety: 1.43\n  Max Deflection: 4.34e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.2249261824775,
      "fos_buckling": 1.4251922695576913,
      "fos_yielding": 2.0216757512163985,
      "deflection": 0.004343001845549094,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_3283",
      "improvement_over_parent": null
    },
    "node_3285": {
      "node_id": "node_3285",
      "content": "MODIFICATION: Increase 0 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 292.22 kg\n  Factor of Safety: 1.51\n  Max Deflection: 4.08e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 292.21579930766177,
      "fos_buckling": 1.5068908274606985,
      "fos_yielding": 2.018571446561904,
      "deflection": 0.004084960138584105,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.524)"
      },
      "parent_node_id": "node_3284",
      "improvement_over_parent": null
    },
    "node_3286": {
      "node_id": "node_3286",
      "content": "MODIFICATION: Increase 5 thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2420428404496,
      "fos_buckling": 1.5229002279887351,
      "fos_yielding": 2.0124344333005855,
      "deflection": 0.004040412026708321,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.269)"
      },
      "parent_node_id": "node_3285",
      "improvement_over_parent": null
    },
    "node_3287": {
      "node_id": "node_3287",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3286",
      "improvement_over_parent": null
    },
    "node_3288": {
      "node_id": "node_3288",
      "content": "INITIAL DESIGN (Trace 472)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 218.90 kg\n  Factor of Safety: 0.69\n  Max Deflection: 6.26e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 218.8991375775251,
      "fos_buckling": 0.6946865642801928,
      "fos_yielding": 1.4606899674052989,
      "deflection": 0.006256849785442855,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3289": {
      "node_id": "node_3289",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 244.93 kg\n  Factor of Safety: 0.77\n  Max Deflection: 5.60e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.93394709599514,
      "fos_buckling": 0.768792021609743,
      "fos_yielding": 1.6386139369168475,
      "deflection": 0.005595511010220077,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.130)"
      },
      "parent_node_id": "node_3288",
      "improvement_over_parent": null
    },
    "node_3290": {
      "node_id": "node_3290",
      "content": "MODIFICATION: Increase 9 thickness by 52%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 259.35 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.3460970479274,
      "fos_buckling": 1.0724876360250544,
      "fos_yielding": 1.6386139369168475,
      "deflection": 0.00485255598676441,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.524)"
      },
      "parent_node_id": "node_3289",
      "improvement_over_parent": null
    },
    "node_3291": {
      "node_id": "node_3291",
      "content": "MODIFICATION: Increase 6 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.18 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.17603030472117,
      "fos_buckling": 1.0724876360250544,
      "fos_yielding": 2.2879506136794174,
      "deflection": 0.00485255598676441,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.435)"
      },
      "parent_node_id": "node_3290",
      "improvement_over_parent": null
    },
    "node_3292": {
      "node_id": "node_3292",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.15 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.15457635379755,
      "fos_buckling": 1.5227689119204744,
      "fos_yielding": 2.012325527823297,
      "deflection": 0.004041676352292586,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_3291",
      "improvement_over_parent": null
    },
    "node_3293": {
      "node_id": "node_3293",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3292",
      "improvement_over_parent": null
    },
    "node_3294": {
      "node_id": "node_3294",
      "content": "INITIAL DESIGN (Trace 473)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 167.30 kg\n  Factor of Safety: 0.38\n  Max Deflection: 1.11e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 167.300815018224,
      "fos_buckling": 0.376815553416085,
      "fos_yielding": 1.071161315039723,
      "deflection": 0.011110431007077379,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3295": {
      "node_id": "node_3295",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 202.90 kg\n  Factor of Safety: 0.44\n  Max Deflection: 9.18e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 202.89568838801208,
      "fos_buckling": 0.4446408464228808,
      "fos_yielding": 1.2974650075763141,
      "deflection": 0.00917967981714366,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.229)"
      },
      "parent_node_id": "node_3294",
      "improvement_over_parent": null
    },
    "node_3296": {
      "node_id": "node_3296",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 239.61 kg\n  Factor of Safety: 1.02\n  Max Deflection: 4.97e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 239.61303531761445,
      "fos_buckling": 1.0162550718526806,
      "fos_yielding": 1.6322342059054926,
      "deflection": 0.0049746561299392825,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005072)"
      },
      "parent_node_id": "node_3295",
      "improvement_over_parent": null
    },
    "node_3297": {
      "node_id": "node_3297",
      "content": "MODIFICATION: Increase 4 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0047)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 241.57 kg\n  Factor of Safety: 1.30\n  Max Deflection: 4.89e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 241.57171799806505,
      "fos_buckling": 1.2980427304818518,
      "fos_yielding": 1.659935142783943,
      "deflection": 0.004890087188223475,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.548)"
      },
      "parent_node_id": "node_3296",
      "improvement_over_parent": null
    },
    "node_3298": {
      "node_id": "node_3298",
      "content": "MODIFICATION: Increase all_members thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.27 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.26711142307033,
      "fos_buckling": 1.5228175707643388,
      "fos_yielding": 2.012806575172334,
      "deflection": 0.0040401856565914045,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.235)"
      },
      "parent_node_id": "node_3297",
      "improvement_over_parent": null
    },
    "node_3299": {
      "node_id": "node_3299",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3298",
      "improvement_over_parent": null
    },
    "node_3300": {
      "node_id": "node_3300",
      "content": "INITIAL DESIGN (Trace 474)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 176.55 kg\n  Factor of Safety: 0.71\n  Max Deflection: 7.54e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 176.5502078937074,
      "fos_buckling": 0.7097541826434558,
      "fos_yielding": 1.3226472549614028,
      "deflection": 0.007541647972293519,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3301": {
      "node_id": "node_3301",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n\nPerformance:\n  Mass: 193.65 kg\n  Factor of Safety: 1.07\n  Max Deflection: 6.08e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 193.65348559214948,
      "fos_buckling": 1.0733878494971953,
      "fos_yielding": 1.3320613377423693,
      "deflection": 0.006083044935044127,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003205)"
      },
      "parent_node_id": "node_3300",
      "improvement_over_parent": null
    },
    "node_3302": {
      "node_id": "node_3302",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0049)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0041)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0052)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0044)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0053)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n\nPerformance:\n  Mass: 251.55 kg\n  Factor of Safety: 1.34\n  Max Deflection: 4.70e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.54547478356497,
      "fos_buckling": 1.343076141754537,
      "fos_yielding": 1.728017683388031,
      "deflection": 0.004698852597926415,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.323)"
      },
      "parent_node_id": "node_3301",
      "improvement_over_parent": null
    },
    "node_3303": {
      "node_id": "node_3303",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2223127205812,
      "fos_buckling": 1.5228793993274783,
      "fos_yielding": 2.0124300384036866,
      "deflection": 0.004040738749623,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.182)"
      },
      "parent_node_id": "node_3302",
      "improvement_over_parent": null
    },
    "node_3304": {
      "node_id": "node_3304",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3303",
      "improvement_over_parent": null
    },
    "node_3305": {
      "node_id": "node_3305",
      "content": "INITIAL DESIGN (Trace 475)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 262.04 kg\n  Factor of Safety: 1.18\n  Max Deflection: 4.69e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.03931184071826,
      "fos_buckling": 1.1785640778890014,
      "fos_yielding": 1.967744187987274,
      "deflection": 0.0046858054421942295,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3306": {
      "node_id": "node_3306",
      "content": "MODIFICATION: Increase 7 thickness by 43%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 274.23 kg\n  Factor of Safety: 1.33\n  Max Deflection: 4.42e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 274.2251008904134,
      "fos_buckling": 1.332284386167713,
      "fos_yielding": 1.9655884077128007,
      "deflection": 0.004421816315368078,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.431)"
      },
      "parent_node_id": "node_3305",
      "improvement_over_parent": null
    },
    "node_3307": {
      "node_id": "node_3307",
      "content": "MODIFICATION: Increase 8 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0027)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 279.34 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.38e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 279.3363805179489,
      "fos_buckling": 1.3143292254736532,
      "fos_yielding": 1.9660302836974304,
      "deflection": 0.004379703690482266,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.202)"
      },
      "parent_node_id": "node_3306",
      "improvement_over_parent": null
    },
    "node_3308": {
      "node_id": "node_3308",
      "content": "MODIFICATION: Increase 4 thickness by 40%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0037)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 281.23 kg\n  Factor of Safety: 1.46\n  Max Deflection: 4.33e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 281.2312251187532,
      "fos_buckling": 1.4631996734994168,
      "fos_yielding": 1.9666972734738124,
      "deflection": 0.004329677705192399,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.403)"
      },
      "parent_node_id": "node_3307",
      "improvement_over_parent": null
    },
    "node_3309": {
      "node_id": "node_3309",
      "content": "MODIFICATION: Increase 1 thickness by 57%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22246428632116,
      "fos_buckling": 1.522966534728942,
      "fos_yielding": 2.012411304970026,
      "deflection": 0.004040684795456039,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.570)"
      },
      "parent_node_id": "node_3308",
      "improvement_over_parent": null
    },
    "node_3310": {
      "node_id": "node_3310",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3309",
      "improvement_over_parent": null
    },
    "node_3311": {
      "node_id": "node_3311",
      "content": "INITIAL DESIGN (Trace 476)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 231.74 kg\n  Factor of Safety: 0.87\n  Max Deflection: 7.29e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.7355910974858,
      "fos_buckling": 0.8651038255061494,
      "fos_yielding": 1.8502575165507833,
      "deflection": 0.007293487248952911,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3312": {
      "node_id": "node_3312",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n\nPerformance:\n  Mass: 235.03 kg\n  Factor of Safety: 1.25\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.02930142025693,
      "fos_buckling": 1.2516871120397048,
      "fos_yielding": 1.6268324919778028,
      "deflection": 0.005067214726878198,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002017)"
      },
      "parent_node_id": "node_3311",
      "improvement_over_parent": null
    },
    "node_3313": {
      "node_id": "node_3313",
      "content": "MODIFICATION: Increase 5 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0040)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0047)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n\nPerformance:\n  Mass: 237.17 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.02e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 237.17227301518395,
      "fos_buckling": 1.2239149845828032,
      "fos_yielding": 2.0492019778377544,
      "deflection": 0.0050175766348188895,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.294)"
      },
      "parent_node_id": "node_3312",
      "improvement_over_parent": null
    },
    "node_3314": {
      "node_id": "node_3314",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0059)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 294.79 kg\n  Factor of Safety: 1.49\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 294.78786689986003,
      "fos_buckling": 1.4893612511171772,
      "fos_yielding": 2.528655391433399,
      "deflection": 0.004049187215546088,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.267)"
      },
      "parent_node_id": "node_3313",
      "improvement_over_parent": null
    },
    "node_3315": {
      "node_id": "node_3315",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3314",
      "improvement_over_parent": null
    },
    "node_3316": {
      "node_id": "node_3316",
      "content": "INITIAL DESIGN (Trace 477)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0010)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n\nPerformance:\n  Mass: 177.69 kg\n  Factor of Safety: 0.68\n  Max Deflection: 9.37e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.68666246383594,
      "fos_buckling": 0.6775550760706137,
      "fos_yielding": 1.0873737824954368,
      "deflection": 0.009366275040284004,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3317": {
      "node_id": "node_3317",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0010)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n\nPerformance:\n  Mass: 180.95 kg\n  Factor of Safety: 0.54\n  Max Deflection: 6.70e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.9494451730271,
      "fos_buckling": 0.5390140241479211,
      "fos_yielding": 0.8273064524594134,
      "deflection": 0.006700123139412368,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001997)"
      },
      "parent_node_id": "node_3316",
      "improvement_over_parent": null
    },
    "node_3318": {
      "node_id": "node_3318",
      "content": "MODIFICATION: Increase 4 thickness by 55%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0030)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0028)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0033)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0038)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0020)]\n\nPerformance:\n  Mass: 181.95 kg\n  Factor of Safety: 0.78\n  Max Deflection: 6.53e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.94674937469117,
      "fos_buckling": 0.7810416006723515,
      "fos_yielding": 1.226424964721324,
      "deflection": 0.0065324030900847235,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.548)"
      },
      "parent_node_id": "node_3317",
      "improvement_over_parent": null
    },
    "node_3319": {
      "node_id": "node_3319",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0040)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0035)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0034)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0032)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0043)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0023)]\n\nPerformance:\n  Mass: 207.42 kg\n  Factor of Safety: 0.88\n  Max Deflection: 5.74e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.41562455194705,
      "fos_buckling": 0.8832334744099288,
      "fos_yielding": 1.400248023008254,
      "deflection": 0.005738240975872801,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.149)"
      },
      "parent_node_id": "node_3318",
      "improvement_over_parent": null
    },
    "node_3320": {
      "node_id": "node_3320",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0019)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 233.29 kg\n  Factor of Safety: 0.99\n  Max Deflection: 5.11e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.28617956505832,
      "fos_buckling": 0.9852359519938284,
      "fos_yielding": 1.5774934825309268,
      "deflection": 0.005109066796975151,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.134)"
      },
      "parent_node_id": "node_3319",
      "improvement_over_parent": null
    },
    "node_3321": {
      "node_id": "node_3321",
      "content": "MODIFICATION: Increase 4 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n\nPerformance:\n  Mass: 235.23 kg\n  Factor of Safety: 1.27\n  Max Deflection: 5.02e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.23024201020252,
      "fos_buckling": 1.269400244848997,
      "fos_yielding": 1.6164981973228396,
      "deflection": 0.005019961138413016,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.562)"
      },
      "parent_node_id": "node_3320",
      "improvement_over_parent": null
    },
    "node_3322": {
      "node_id": "node_3322",
      "content": "MODIFICATION: Increase all_members thickness by 27%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.29 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.29111070704823,
      "fos_buckling": 1.5231386339289072,
      "fos_yielding": 2.0128565382483488,
      "deflection": 0.004039776876252967,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.271)"
      },
      "parent_node_id": "node_3321",
      "improvement_over_parent": null
    },
    "node_3323": {
      "node_id": "node_3323",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3322",
      "improvement_over_parent": null
    },
    "node_3324": {
      "node_id": "node_3324",
      "content": "INITIAL DESIGN (Trace 478)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0033)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0022)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0036)]\n\nPerformance:\n  Mass: 156.57 kg\n  Factor of Safety: 0.69\n  Max Deflection: 8.07e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 156.56692675534902,
      "fos_buckling": 0.6916803787481431,
      "fos_yielding": 1.367214279274061,
      "deflection": 0.008071820522380353,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3325": {
      "node_id": "node_3325",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n\nPerformance:\n  Mass: 177.81 kg\n  Factor of Safety: 0.77\n  Max Deflection: 7.12e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 177.81494468744452,
      "fos_buckling": 0.7737663407392843,
      "fos_yielding": 1.5524929841049377,
      "deflection": 0.007116857853493114,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_3324",
      "improvement_over_parent": null
    },
    "node_3326": {
      "node_id": "node_3326",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n\nPerformance:\n  Mass: 198.83 kg\n  Factor of Safety: 1.10\n  Max Deflection: 5.93e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.83207735370348,
      "fos_buckling": 1.0984735223860382,
      "fos_yielding": 1.367416790365593,
      "deflection": 0.005926551325873044,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003436)"
      },
      "parent_node_id": "node_3325",
      "improvement_over_parent": null
    },
    "node_3327": {
      "node_id": "node_3327",
      "content": "MODIFICATION: Increase all_members thickness by 16%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 228.32 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.17e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.32198412007529,
      "fos_buckling": 1.2376993969418366,
      "fos_yielding": 1.5691825486878435,
      "deflection": 0.005169943153273051,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.159)"
      },
      "parent_node_id": "node_3326",
      "improvement_over_parent": null
    },
    "node_3328": {
      "node_id": "node_3328",
      "content": "MODIFICATION: Increase all_members thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.02 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.0164150640806,
      "fos_buckling": 1.5220430448922069,
      "fos_yielding": 2.010874775577488,
      "deflection": 0.004043630197749664,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.311)"
      },
      "parent_node_id": "node_3327",
      "improvement_over_parent": null
    },
    "node_3329": {
      "node_id": "node_3329",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3328",
      "improvement_over_parent": null
    },
    "node_3330": {
      "node_id": "node_3330",
      "content": "INITIAL DESIGN (Trace 479)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0015)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0032)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0027)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0021)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0018)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0025)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0034)]\n\nPerformance:\n  Mass: 120.32 kg\n  Factor of Safety: 0.62\n  Max Deflection: 1.29e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 120.32102791853292,
      "fos_buckling": 0.621819833503295,
      "fos_yielding": 1.0359188950584275,
      "deflection": 0.01287552972328499,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3331": {
      "node_id": "node_3331",
      "content": "MODIFICATION: Increase all_members thickness by 18%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0018)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 141.15 kg\n  Factor of Safety: 0.72\n  Max Deflection: 1.10e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.1526266019506,
      "fos_buckling": 0.7162805075370814,
      "fos_yielding": 1.2188447428084643,
      "deflection": 0.01097558196989125,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.183)"
      },
      "parent_node_id": "node_3330",
      "improvement_over_parent": null
    },
    "node_3332": {
      "node_id": "node_3332",
      "content": "MODIFICATION: Increase 0 thickness by 38%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n\nPerformance:\n  Mass: 145.27 kg\n  Factor of Safety: 0.72\n  Max Deflection: 9.84e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 145.26926894031095,
      "fos_buckling": 0.716076872520459,
      "fos_yielding": 1.5236619433853533,
      "deflection": 0.009843862449584283,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.383)"
      },
      "parent_node_id": "node_3331",
      "improvement_over_parent": null
    },
    "node_3333": {
      "node_id": "node_3333",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0025)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0040)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n\nPerformance:\n  Mass: 167.18 kg\n  Factor of Safety: 0.76\n  Max Deflection: 7.61e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 167.18279736825062,
      "fos_buckling": 0.7615585481975513,
      "fos_yielding": 1.5236619433853533,
      "deflection": 0.007606459977932711,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003472)"
      },
      "parent_node_id": "node_3332",
      "improvement_over_parent": null
    },
    "node_3334": {
      "node_id": "node_3334",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0050)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0043)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0039)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0053)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0054)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n\nPerformance:\n  Mass: 217.56 kg\n  Factor of Safety: 0.95\n  Max Deflection: 5.86e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 217.56055616062076,
      "fos_buckling": 0.953602231855961,
      "fos_yielding": 1.9807593368235716,
      "deflection": 0.005862126684742639,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.325)"
      },
      "parent_node_id": "node_3333",
      "improvement_over_parent": null
    },
    "node_3335": {
      "node_id": "node_3335",
      "content": "MODIFICATION: Increase all_members thickness by 17%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 251.53 kg\n  Factor of Safety: 1.07\n  Max Deflection: 5.08e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.5333318772063,
      "fos_buckling": 1.0735098719176028,
      "fos_yielding": 2.2884171158368125,
      "deflection": 0.005080242455075596,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.171)"
      },
      "parent_node_id": "node_3334",
      "improvement_over_parent": null
    },
    "node_3336": {
      "node_id": "node_3336",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 282.51 kg\n  Factor of Safety: 1.50\n  Max Deflection: 4.28e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.5118779262827,
      "fos_buckling": 1.495077909113981,
      "fos_yielding": 2.0152497993425404,
      "deflection": 0.0042844433324001055,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)"
      },
      "parent_node_id": "node_3335",
      "improvement_over_parent": null
    },
    "node_3337": {
      "node_id": "node_3337",
      "content": "MODIFICATION: Increase 0 thickness by 51%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0058)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 293.33 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.32639840817245,
      "fos_buckling": 1.5230375251459236,
      "fos_yielding": 2.012753053413838,
      "deflection": 0.00403927179892475,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.511)"
      },
      "parent_node_id": "node_3336",
      "improvement_over_parent": null
    },
    "node_3338": {
      "node_id": "node_3338",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3337",
      "improvement_over_parent": null
    },
    "node_3339": {
      "node_id": "node_3339",
      "content": "INITIAL DESIGN (Trace 480)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0018)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0018)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0012)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0010)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0014)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0019)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0017)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0016)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0020)]\n\nPerformance:\n  Mass: 81.43 kg\n  Factor of Safety: 0.38\n  Max Deflection: 1.75e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 81.42543165073548,
      "fos_buckling": 0.38250715670039476,
      "fos_yielding": 0.76785622279135,
      "deflection": 0.01749003022028322,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3340": {
      "node_id": "node_3340",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0018)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0018)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0012)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0010)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0014)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0019)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0017)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0016)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0020)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0015)]\n\nPerformance:\n  Mass: 89.59 kg\n  Factor of Safety: 0.38\n  Max Deflection: 1.48e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 89.59499171251451,
      "fos_buckling": 0.38229057582036485,
      "fos_yielding": 0.6726525392670003,
      "deflection": 0.014781001962920851,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.001534)"
      },
      "parent_node_id": "node_3339",
      "improvement_over_parent": null
    },
    "node_3341": {
      "node_id": "node_3341",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0024)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0024)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0016)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0019)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0022)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0021)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0026)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0020)]\n\nPerformance:\n  Mass: 115.44 kg\n  Factor of Safety: 0.48\n  Max Deflection: 1.15e-02 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 115.44421822368945,
      "fos_buckling": 0.48408703034946743,
      "fos_yielding": 0.8661772117186967,
      "deflection": 0.011489806696551117,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.299)"
      },
      "parent_node_id": "node_3340",
      "improvement_over_parent": null
    },
    "node_3342": {
      "node_id": "node_3342",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0027)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n\nPerformance:\n  Mass: 141.83 kg\n  Factor of Safety: 0.58\n  Max Deflection: 9.37e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 141.82650048544537,
      "fos_buckling": 0.5840949012680223,
      "fos_yielding": 1.063442515522657,
      "deflection": 0.009367809540514903,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.239)"
      },
      "parent_node_id": "node_3341",
      "improvement_over_parent": null
    },
    "node_3343": {
      "node_id": "node_3343",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0037)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0038)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0035)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0041)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n\nPerformance:\n  Mass: 179.29 kg\n  Factor of Safety: 0.72\n  Max Deflection: 7.43e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 179.2918328865043,
      "fos_buckling": 0.7194064874065974,
      "fos_yielding": 1.3431445072907793,
      "deflection": 0.007427488065522722,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.280)"
      },
      "parent_node_id": "node_3342",
      "improvement_over_parent": null
    },
    "node_3344": {
      "node_id": "node_3344",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0043)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n\nPerformance:\n  Mass: 216.31 kg\n  Factor of Safety: 0.85\n  Max Deflection: 6.17e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.3091218898667,
      "fos_buckling": 0.8454181960432293,
      "fos_yielding": 1.6190032608892175,
      "deflection": 0.006170499755710825,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.222)"
      },
      "parent_node_id": "node_3343",
      "improvement_over_parent": null
    },
    "node_3345": {
      "node_id": "node_3345",
      "content": "MODIFICATION: Increase all_members thickness by 26%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 267.14 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.1404050718079,
      "fos_buckling": 1.006115414782196,
      "fos_yielding": 1.9970014236400815,
      "deflection": 0.005012046295588926,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.258)"
      },
      "parent_node_id": "node_3344",
      "improvement_over_parent": null
    },
    "node_3346": {
      "node_id": "node_3346",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.04 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.03784221419767,
      "fos_buckling": 1.52201265930651,
      "fos_yielding": 2.011117590766477,
      "deflection": 0.004043288211523647,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_3345",
      "improvement_over_parent": null
    },
    "node_3347": {
      "node_id": "node_3347",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3346",
      "improvement_over_parent": null
    },
    "node_3348": {
      "node_id": "node_3348",
      "content": "INITIAL DESIGN (Trace 481)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (6 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3349": {
      "node_id": "node_3349",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n\nPerformance:\n  Mass: 152.51 kg\n  Factor of Safety: 0.57\n  Max Deflection: 3.98e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 152.50755908472667,
      "fos_buckling": 0.5681053048558735,
      "fos_yielding": 1.9071036408850255,
      "deflection": 39782317632336.695,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004475)"
      },
      "parent_node_id": "node_3348",
      "improvement_over_parent": null
    },
    "node_3350": {
      "node_id": "node_3350",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n\nPerformance:\n  Mass: 174.37 kg\n  Factor of Safety: 0.34\n  Max Deflection: 2.85e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.36880249709418,
      "fos_buckling": 0.3418654223315282,
      "fos_yielding": 0.5373398379405104,
      "deflection": 28512341078163.02,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004167)"
      },
      "parent_node_id": "node_3349",
      "improvement_over_parent": null
    },
    "node_3351": {
      "node_id": "node_3351",
      "content": "MODIFICATION: Increase 1 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n\nPerformance:\n  Mass: 184.89 kg\n  Factor of Safety: 0.45\n  Max Deflection: 7.93e+12 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 184.89052437211296,
      "fos_buckling": 0.4544842438846988,
      "fos_yielding": 1.6214195639756264,
      "deflection": 7928274105535.984,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.595)"
      },
      "parent_node_id": "node_3350",
      "improvement_over_parent": null
    },
    "node_3352": {
      "node_id": "node_3352",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 219.06 kg\n  Factor of Safety: 0.34\n  Max Deflection: 2.86e+13 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.06253872230522,
      "fos_buckling": 0.336759008970166,
      "fos_yielding": 1.7979933367863532,
      "deflection": 28588075670221.906,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.203)"
      },
      "parent_node_id": "node_3351",
      "improvement_over_parent": null
    },
    "node_3353": {
      "node_id": "node_3353",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 224.28 kg\n  Factor of Safety: 0.96\n  Max Deflection: 7.73e+12 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 224.27636875611933,
      "fos_buckling": 0.9582499489872086,
      "fos_yielding": 2.250614742552751,
      "deflection": 7733265427506.677,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3352",
      "improvement_over_parent": null
    },
    "node_3354": {
      "node_id": "node_3354",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 268.86 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 268.8582999240652,
      "fos_buckling": 1.0721246810846634,
      "fos_yielding": 2.2875097603866017,
      "deflection": 0.00485307293818083,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_3353",
      "improvement_over_parent": null
    },
    "node_3355": {
      "node_id": "node_3355",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M5: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M8: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 293.24 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2397718848973,
      "fos_buckling": 1.5230632143081335,
      "fos_yielding": 2.0127164361834,
      "deflection": 0.0040405910091287755,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_3354",
      "improvement_over_parent": null
    },
    "node_3356": {
      "node_id": "node_3356",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3355",
      "improvement_over_parent": null
    },
    "node_3357": {
      "node_id": "node_3357",
      "content": "INITIAL DESIGN (Trace 482)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 0.00 kg\n  Factor of Safety: 0.00\n  Max Deflection: inf m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 0,
      "fos_buckling": 0,
      "fos_yielding": 0,
      "deflection": Infinity,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3358": {
      "node_id": "node_3358",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n\nPerformance:\n  Mass: 168.93 kg\n  Factor of Safety: 0.78\n  Max Deflection: 7.44e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 168.93380236451148,
      "fos_buckling": 0.779482714947841,
      "fos_yielding": 1.5643658974446137,
      "deflection": 0.007435055496978347,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003224)"
      },
      "parent_node_id": "node_3357",
      "improvement_over_parent": null
    },
    "node_3359": {
      "node_id": "node_3359",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0031)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 190.10 kg\n  Factor of Safety: 0.98\n  Max Deflection: 6.28e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.10067537119465,
      "fos_buckling": 0.9781376693535647,
      "fos_yielding": 1.3796981593422477,
      "deflection": 0.006277009079089494,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003462)"
      },
      "parent_node_id": "node_3358",
      "improvement_over_parent": null
    },
    "node_3360": {
      "node_id": "node_3360",
      "content": "MODIFICATION: Increase 0 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 194.04 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.13e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 194.04248588281504,
      "fos_buckling": 0.9447048145949707,
      "fos_yielding": 1.3790051309945939,
      "deflection": 0.006129990741185962,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.217)"
      },
      "parent_node_id": "node_3359",
      "improvement_over_parent": null
    },
    "node_3361": {
      "node_id": "node_3361",
      "content": "MODIFICATION: Increase 7 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0025)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0030)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0046)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n\nPerformance:\n  Mass: 200.05 kg\n  Factor of Safety: 0.98\n  Max Deflection: 6.03e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.0509503675868,
      "fos_buckling": 0.978943411693716,
      "fos_yielding": 1.3795508389222115,
      "deflection": 0.006026424756887953,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.289)"
      },
      "parent_node_id": "node_3360",
      "improvement_over_parent": null
    },
    "node_3362": {
      "node_id": "node_3362",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0040)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0058)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 246.89 kg\n  Factor of Safety: 1.18\n  Max Deflection: 4.89e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.8916790034221,
      "fos_buckling": 1.181636839598268,
      "fos_yielding": 1.7011656342052226,
      "deflection": 0.00489370291100952,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.253)"
      },
      "parent_node_id": "node_3361",
      "improvement_over_parent": null
    },
    "node_3363": {
      "node_id": "node_3363",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0069)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 292.45 kg\n  Factor of Safety: 1.37\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 292.4484036116881,
      "fos_buckling": 1.3690775411000984,
      "fos_yielding": 2.013488698280753,
      "deflection": 0.004139967774356295,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.203)"
      },
      "parent_node_id": "node_3362",
      "improvement_over_parent": null
    },
    "node_3364": {
      "node_id": "node_3364",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3363",
      "improvement_over_parent": null
    },
    "node_3365": {
      "node_id": "node_3365",
      "content": "INITIAL DESIGN (Trace 483)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 198.45 kg\n  Factor of Safety: 0.91\n  Max Deflection: 6.10e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 198.4491063761054,
      "fos_buckling": 0.9102072974971097,
      "fos_yielding": 1.0253868685557408,
      "deflection": 0.006096221378314678,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3366": {
      "node_id": "node_3366",
      "content": "MODIFICATION: Increase 9 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0035)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 202.37 kg\n  Factor of Safety: 0.90\n  Max Deflection: 6.05e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 202.37423271810934,
      "fos_buckling": 0.9048411114392038,
      "fos_yielding": 1.0193416338788335,
      "deflection": 0.00604778195598096,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.215)"
      },
      "parent_node_id": "node_3365",
      "improvement_over_parent": null
    },
    "node_3367": {
      "node_id": "node_3367",
      "content": "MODIFICATION: Increase 7 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 209.76 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.85e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 209.7586869124676,
      "fos_buckling": 0.9041726413864569,
      "fos_yielding": 1.0185885742011158,
      "deflection": 0.005853472901735225,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.312)"
      },
      "parent_node_id": "node_3366",
      "improvement_over_parent": null
    },
    "node_3368": {
      "node_id": "node_3368",
      "content": "MODIFICATION: Increase 0 thickness by 64%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0042)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0043)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0037)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0036)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0028)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0024)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0022)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0046)]\n\nPerformance:\n  Mass: 219.42 kg\n  Factor of Safety: 0.90\n  Max Deflection: 5.45e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.42119112219956,
      "fos_buckling": 0.9028113939861665,
      "fos_yielding": 1.0170550716540019,
      "deflection": 0.0054468878776258575,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.642)"
      },
      "parent_node_id": "node_3367",
      "improvement_over_parent": null
    },
    "node_3369": {
      "node_id": "node_3369",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0026)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 259.88 kg\n  Factor of Safety: 1.06\n  Max Deflection: 4.61e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 259.87556049358165,
      "fos_buckling": 1.0564908451921817,
      "fos_yielding": 1.2090765441626807,
      "deflection": 0.004608681384390517,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.200)"
      },
      "parent_node_id": "node_3368",
      "improvement_over_parent": null
    },
    "node_3370": {
      "node_id": "node_3370",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 289.70 kg\n  Factor of Safety: 1.17\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.70018467539444,
      "fos_buckling": 1.1672089109098531,
      "fos_yielding": 1.3517625148136119,
      "deflection": 0.004140605556456589,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.126)"
      },
      "parent_node_id": "node_3369",
      "improvement_over_parent": null
    },
    "node_3371": {
      "node_id": "node_3371",
      "content": "MODIFICATION: Increase 6 thickness by 56%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.07 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.07024006600557,
      "fos_buckling": 1.5223195426111098,
      "fos_yielding": 2.0127703943858535,
      "deflection": 0.004042680063811494,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.560)"
      },
      "parent_node_id": "node_3370",
      "improvement_over_parent": null
    },
    "node_3372": {
      "node_id": "node_3372",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3371",
      "improvement_over_parent": null
    },
    "node_3373": {
      "node_id": "node_3373",
      "content": "INITIAL DESIGN (Trace 484)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 207.07 kg\n  Factor of Safety: 0.88\n  Max Deflection: 6.12e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.06629262010364,
      "fos_buckling": 0.8822266816682302,
      "fos_yielding": 1.8074543222367654,
      "deflection": 0.0061228164517325686,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3374": {
      "node_id": "node_3374",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 227.16 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.16e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.15887312956397,
      "fos_buckling": 1.2220088302961878,
      "fos_yielding": 1.6029862311278278,
      "deflection": 0.005159524022683775,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003276)"
      },
      "parent_node_id": "node_3373",
      "improvement_over_parent": null
    },
    "node_3375": {
      "node_id": "node_3375",
      "content": "MODIFICATION: Increase 9 thickness by 23%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0060)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 234.66 kg\n  Factor of Safety: 1.26\n  Max Deflection: 4.99e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 234.66359058947785,
      "fos_buckling": 1.259348872013006,
      "fos_yielding": 1.6191251241449376,
      "deflection": 0.004989475870508438,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.233)"
      },
      "parent_node_id": "node_3374",
      "improvement_over_parent": null
    },
    "node_3376": {
      "node_id": "node_3376",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0077)]\n  M10: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0042)]\n\nPerformance:\n  Mass: 296.91 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.96e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 296.90747146474723,
      "fos_buckling": 1.5303424346347838,
      "fos_yielding": 2.046357235983706,
      "deflection": 0.003958095638570905,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.292)"
      },
      "parent_node_id": "node_3375",
      "improvement_over_parent": null
    },
    "node_3377": {
      "node_id": "node_3377",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3376",
      "improvement_over_parent": null
    },
    "node_3378": {
      "node_id": "node_3378",
      "content": "INITIAL DESIGN (Trace 485)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0046)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0039)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0049)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0030)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0032)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0050)]\n\nPerformance:\n  Mass: 199.82 kg\n  Factor of Safety: 0.85\n  Max Deflection: 7.23e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 199.82290216702626,
      "fos_buckling": 0.8486698051956009,
      "fos_yielding": 1.8442642640217544,
      "deflection": 0.0072250560131683845,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3379": {
      "node_id": "node_3379",
      "content": "MODIFICATION: Increase all_members thickness by 25%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 246.47 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.87e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.47313771824298,
      "fos_buckling": 1.0083806039996788,
      "fos_yielding": 2.2678947177083186,
      "deflection": 0.0058720740339004655,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.255)"
      },
      "parent_node_id": "node_3378",
      "improvement_over_parent": null
    },
    "node_3380": {
      "node_id": "node_3380",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 251.69 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 251.6869677520571,
      "fos_buckling": 1.0076595379916045,
      "fos_yielding": 2.0177637356833333,
      "deflection": 0.005071809395237855,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3379",
      "improvement_over_parent": null
    },
    "node_3381": {
      "node_id": "node_3381",
      "content": "MODIFICATION: Increase 8 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0081)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 263.44 kg\n  Factor of Safety: 1.01\n  Max Deflection: 4.92e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 263.4414364493685,
      "fos_buckling": 1.0068479594189805,
      "fos_yielding": 2.041035000235557,
      "deflection": 0.004918971895420752,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.299)"
      },
      "parent_node_id": "node_3380",
      "improvement_over_parent": null
    },
    "node_3382": {
      "node_id": "node_3382",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0081)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n\nPerformance:\n  Mass: 282.50 kg\n  Factor of Safety: 1.42\n  Max Deflection: 4.09e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 282.4994888063978,
      "fos_buckling": 1.4150939342577669,
      "fos_yielding": 2.053156503259857,
      "deflection": 0.0040915859764655725,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003596)"
      },
      "parent_node_id": "node_3381",
      "improvement_over_parent": null
    },
    "node_3383": {
      "node_id": "node_3383",
      "content": "MODIFICATION: Increase 8 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0115)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n\nPerformance:\n  Mass: 301.64 kg\n  Factor of Safety: 1.42\n  Max Deflection: 3.93e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 301.6424111140922,
      "fos_buckling": 1.4160957170345199,
      "fos_yielding": 2.0788319051948556,
      "deflection": 0.003925537736303719,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.410)"
      },
      "parent_node_id": "node_3382",
      "improvement_over_parent": null
    },
    "node_3384": {
      "node_id": "node_3384",
      "content": "MODIFICATION: Increase 2 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0068)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0038)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0115)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0036)]\n\nPerformance:\n  Mass: 310.01 kg\n  Factor of Safety: 1.41\n  Max Deflection: 3.90e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 310.0105332869765,
      "fos_buckling": 1.4139555113008095,
      "fos_yielding": 2.064939211391647,
      "deflection": 0.0038955297094021854,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.393)"
      },
      "parent_node_id": "node_3383",
      "improvement_over_parent": null
    },
    "node_3385": {
      "node_id": "node_3385",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3384",
      "improvement_over_parent": null
    },
    "node_3386": {
      "node_id": "node_3386",
      "content": "INITIAL DESIGN (Trace 486)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0017)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0017)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0015)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0014)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0011)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0010)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0014)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0018)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0016)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0011)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0019)]\n\nPerformance:\n  Mass: 89.44 kg\n  Factor of Safety: 0.52\n  Max Deflection: 1.30e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 89.4385386692282,
      "fos_buckling": 0.5212906141755967,
      "fos_yielding": 0.6444468936327545,
      "deflection": 0.012962295596490168,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3387": {
      "node_id": "node_3387",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0023)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0020)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0019)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0015)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0018)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0024)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0021)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0014)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0025)]\n\nPerformance:\n  Mass: 118.16 kg\n  Factor of Safety: 0.68\n  Max Deflection: 9.83e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 118.15593383884243,
      "fos_buckling": 0.6764677446942853,
      "fos_yielding": 0.8506172647354024,
      "deflection": 0.009828872009219067,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_3386",
      "improvement_over_parent": null
    },
    "node_3388": {
      "node_id": "node_3388",
      "content": "MODIFICATION: Increase all_members thickness by 14%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0017)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 134.53 kg\n  Factor of Safety: 0.76\n  Max Deflection: 8.64e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 134.52518986435516,
      "fos_buckling": 0.7622897827960445,
      "fos_yielding": 0.9679690475403313,
      "deflection": 0.008641403465862592,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.144)"
      },
      "parent_node_id": "node_3387",
      "improvement_over_parent": null
    },
    "node_3389": {
      "node_id": "node_3389",
      "content": "MODIFICATION: Increase 9 thickness by 42%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0026)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0026)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0022)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0017)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0021)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0028)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0024)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0024)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0028)]\n\nPerformance:\n  Mass: 138.76 kg\n  Factor of Safety: 0.80\n  Max Deflection: 8.46e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 138.75539857094557,
      "fos_buckling": 0.7960411466831114,
      "fos_yielding": 0.9556566902858857,
      "deflection": 0.00846254002640671,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.422)"
      },
      "parent_node_id": "node_3388",
      "improvement_over_parent": null
    },
    "node_3390": {
      "node_id": "node_3390",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0034)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0029)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0028)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0036)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 178.27 kg\n  Factor of Safety: 1.00\n  Max Deflection: 6.60e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 178.27025846810074,
      "fos_buckling": 0.9977913203566307,
      "fos_yielding": 1.2267131511282836,
      "deflection": 0.0066019682375751815,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.300)"
      },
      "parent_node_id": "node_3389",
      "improvement_over_parent": null
    },
    "node_3391": {
      "node_id": "node_3391",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0046)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 225.23 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.24e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 225.23418020357656,
      "fos_buckling": 1.22337482754955,
      "fos_yielding": 1.5482384496931978,
      "deflection": 0.005239689698683946,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.282)"
      },
      "parent_node_id": "node_3390",
      "improvement_over_parent": null
    },
    "node_3392": {
      "node_id": "node_3392",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.36 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3609586439758,
      "fos_buckling": 1.5234379196873178,
      "fos_yielding": 2.01343948575039,
      "deflection": 0.004038819809448956,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_3391",
      "improvement_over_parent": null
    },
    "node_3393": {
      "node_id": "node_3393",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3392",
      "improvement_over_parent": null
    },
    "node_3394": {
      "node_id": "node_3394",
      "content": "INITIAL DESIGN (Trace 487)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.13 kg\n  Factor of Safety: 1.03\n  Max Deflection: 5.87e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.12900980404606,
      "fos_buckling": 1.0259696298116903,
      "fos_yielding": 1.4844310537117045,
      "deflection": 0.005870542285049982,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3395": {
      "node_id": "node_3395",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 265.34 kg\n  Factor of Safety: 1.07\n  Max Deflection: 4.85e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.34283983786014,
      "fos_buckling": 1.07210413207428,
      "fos_yielding": 1.4844310537117045,
      "deflection": 0.004852852403814066,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3394",
      "improvement_over_parent": null
    },
    "node_3396": {
      "node_id": "node_3396",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 289.72 kg\n  Factor of Safety: 1.15\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 289.72431179869227,
      "fos_buckling": 1.1475525209366402,
      "fos_yielding": 1.3260312834415715,
      "deflection": 0.004144416251325602,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)"
      },
      "parent_node_id": "node_3395",
      "improvement_over_parent": null
    },
    "node_3397": {
      "node_id": "node_3397",
      "content": "MODIFICATION: Increase 6 thickness by 59%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0086)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 306.39 kg\n  Factor of Safety: 1.15\n  Max Deflection: 4.05e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 306.3872163473651,
      "fos_buckling": 1.1481811351390703,
      "fos_yielding": 1.3267576659664932,
      "deflection": 0.004047297471112572,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(6, thickness, 1.592)"
      },
      "parent_node_id": "node_3396",
      "improvement_over_parent": null
    },
    "node_3398": {
      "node_id": "node_3398",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3397",
      "improvement_over_parent": null
    },
    "node_3399": {
      "node_id": "node_3399",
      "content": "INITIAL DESIGN (Trace 488)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 162.81 kg\n  Factor of Safety: 0.12\n  Max Deflection: 6.45e+13 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 162.81165835476725,
      "fos_buckling": 0.12491448483927962,
      "fos_yielding": 0.46032595783556723,
      "deflection": 64485588209274.62,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3400": {
      "node_id": "node_3400",
      "content": "MODIFICATION: Increase 3 thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0035)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0044)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0034)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0040)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0039)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0047)]\n\nPerformance:\n  Mass: 163.70 kg\n  Factor of Safety: 0.12\n  Max Deflection: 6.45e+13 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 163.70354313891434,
      "fos_buckling": 0.12491448483927962,
      "fos_yielding": 0.46032595783556723,
      "deflection": 64485588209274.62,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.211)"
      },
      "parent_node_id": "node_3399",
      "improvement_over_parent": null
    },
    "node_3401": {
      "node_id": "node_3401",
      "content": "MODIFICATION: Increase all_members thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 213.34 kg\n  Factor of Safety: 0.34\n  Max Deflection: 1.50e+13 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 213.3404889947372,
      "fos_buckling": 0.33686433423724566,
      "fos_yielding": 1.2160646729817197,
      "deflection": 15040074439886.947,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.332)"
      },
      "parent_node_id": "node_3400",
      "improvement_over_parent": null
    },
    "node_3402": {
      "node_id": "node_3402",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 256.54 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.15e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 256.53854693218943,
      "fos_buckling": 1.007808015528198,
      "fos_yielding": 2.267016701518969,
      "deflection": 0.006149633814180775,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_3401",
      "improvement_over_parent": null
    },
    "node_3403": {
      "node_id": "node_3403",
      "content": "MODIFICATION: Increase 0 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 262.23 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.87e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.23295640750104,
      "fos_buckling": 1.0074146177753545,
      "fos_yielding": 2.2662225619522305,
      "deflection": 0.005869492708167705,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.221)"
      },
      "parent_node_id": "node_3402",
      "improvement_over_parent": null
    },
    "node_3404": {
      "node_id": "node_3404",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 288.13 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.88e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 288.1303935498908,
      "fos_buckling": 1.036768413838455,
      "fos_yielding": 2.29723655468992,
      "deflection": 0.0058771668322018565,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_3403",
      "improvement_over_parent": null
    },
    "node_3405": {
      "node_id": "node_3405",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M9: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.34 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3442235837049,
      "fos_buckling": 1.5235070238709065,
      "fos_yielding": 2.013553216893779,
      "deflection": 0.004039117156401151,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)"
      },
      "parent_node_id": "node_3404",
      "improvement_over_parent": null
    },
    "node_3406": {
      "node_id": "node_3406",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3405",
      "improvement_over_parent": null
    },
    "node_3407": {
      "node_id": "node_3407",
      "content": "INITIAL DESIGN (Trace 489)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n\nPerformance:\n  Mass: 174.77 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.10e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 174.77245015310353,
      "fos_buckling": 0.4327684350919422,
      "fos_yielding": 1.2555581088109165,
      "deflection": 0.010987929394991562,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3408": {
      "node_id": "node_3408",
      "content": "MODIFICATION: Increase 9 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n\nPerformance:\n  Mass: 180.16 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.16085888436228,
      "fos_buckling": 0.4326077856398166,
      "fos_yielding": 1.255123817193324,
      "deflection": 0.01020471498184609,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.300)"
      },
      "parent_node_id": "node_3407",
      "improvement_over_parent": null
    },
    "node_3409": {
      "node_id": "node_3409",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 215.67 kg\n  Factor of Safety: 0.82\n  Max Deflection: 5.79e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 215.67282814737075,
      "fos_buckling": 0.8200728392805408,
      "fos_yielding": 1.3637037330846693,
      "deflection": 0.005793214448630849,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004893)"
      },
      "parent_node_id": "node_3408",
      "improvement_over_parent": null
    },
    "node_3410": {
      "node_id": "node_3410",
      "content": "MODIFICATION: Increase 7 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0031)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 219.99 kg\n  Factor of Safety: 0.88\n  Max Deflection: 5.56e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 219.98967845304966,
      "fos_buckling": 0.8824129436944165,
      "fos_yielding": 1.4048133340100368,
      "deflection": 0.005557321648173722,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.242)"
      },
      "parent_node_id": "node_3409",
      "improvement_over_parent": null
    },
    "node_3411": {
      "node_id": "node_3411",
      "content": "MODIFICATION: Increase 7 thickness by 53%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0045)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0046)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0018)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0036)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0041)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0049)]\n\nPerformance:\n  Mass: 231.42 kg\n  Factor of Safety: 0.93\n  Max Deflection: 5.16e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 231.42427892712,
      "fos_buckling": 0.929614746186427,
      "fos_yielding": 1.4799592416079743,
      "deflection": 0.005160703132994833,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.534)"
      },
      "parent_node_id": "node_3410",
      "improvement_over_parent": null
    },
    "node_3412": {
      "node_id": "node_3412",
      "content": "MODIFICATION: Increase all_members thickness by 28%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 290.49 kg\n  Factor of Safety: 1.15\n  Max Deflection: 4.12e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 290.4850346274117,
      "fos_buckling": 1.1471744878865566,
      "fos_yielding": 1.8666208906132198,
      "deflection": 0.004124354326531012,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.280)"
      },
      "parent_node_id": "node_3411",
      "improvement_over_parent": null
    },
    "node_3413": {
      "node_id": "node_3413",
      "content": "MODIFICATION: Increase 4 thickness by 66%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.1335874649716,
      "fos_buckling": 1.522510421445084,
      "fos_yielding": 2.011923915445322,
      "deflection": 0.004041921916081449,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.661)"
      },
      "parent_node_id": "node_3412",
      "improvement_over_parent": null
    },
    "node_3414": {
      "node_id": "node_3414",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3413",
      "improvement_over_parent": null
    },
    "node_3415": {
      "node_id": "node_3415",
      "content": "INITIAL DESIGN (Trace 490)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 221.02 kg\n  Factor of Safety: 0.52\n  Max Deflection: 8.49e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.02367007583106,
      "fos_buckling": 0.5226271001546898,
      "fos_yielding": 1.573607710480587,
      "deflection": 0.008491806543434356,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3416": {
      "node_id": "node_3416",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 265.61 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.03e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.60560124377696,
      "fos_buckling": 1.006894860656783,
      "fos_yielding": 2.0044857830994687,
      "deflection": 0.005029901597037323,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_3415",
      "improvement_over_parent": null
    },
    "node_3417": {
      "node_id": "node_3417",
      "content": "MODIFICATION: Increase 4 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 266.39 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.02e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 266.3873468470533,
      "fos_buckling": 1.0067870072929515,
      "fos_yielding": 2.0011144388837234,
      "deflection": 0.005018166554731489,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.241)"
      },
      "parent_node_id": "node_3416",
      "improvement_over_parent": null
    },
    "node_3418": {
      "node_id": "node_3418",
      "content": "MODIFICATION: Increase 4 thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 267.33 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 267.3290709271416,
      "fos_buckling": 1.0066571132107731,
      "fos_yielding": 1.998319116804918,
      "deflection": 0.005008643332555104,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.242)"
      },
      "parent_node_id": "node_3417",
      "improvement_over_parent": null
    },
    "node_3419": {
      "node_id": "node_3419",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M5: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M6: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22650806953135,
      "fos_buckling": 1.522913832904232,
      "fos_yielding": 2.0124415773739246,
      "deflection": 0.004040662918949349,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)"
      },
      "parent_node_id": "node_3418",
      "improvement_over_parent": null
    },
    "node_3420": {
      "node_id": "node_3420",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3419",
      "improvement_over_parent": null
    },
    "node_3421": {
      "node_id": "node_3421",
      "content": "INITIAL DESIGN (Trace 491)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 242.07 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.58e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.0698733102951,
      "fos_buckling": 0.5886360969282817,
      "fos_yielding": 1.3039817332512282,
      "deflection": 0.007584305455087318,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3422": {
      "node_id": "node_3422",
      "content": "MODIFICATION: Increase 4 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 244.28 kg\n  Factor of Safety: 0.59\n  Max Deflection: 7.32e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.28235915446862,
      "fos_buckling": 0.5886360969282816,
      "fos_yielding": 1.9005333840265304,
      "deflection": 0.007319777089516641,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(4, thickness, 1.502)"
      },
      "parent_node_id": "node_3421",
      "improvement_over_parent": null
    },
    "node_3423": {
      "node_id": "node_3423",
      "content": "MODIFICATION: Add member connecting joints 0 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 287.48 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.16e-03 m\n  Status: FEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 287.48041709192086,
      "fos_buckling": 1.5236075597746197,
      "fos_yielding": 1.994035435173197,
      "deflection": 0.004155396475509968,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)"
      },
      "parent_node_id": "node_3422",
      "improvement_over_parent": null
    },
    "node_3424": {
      "node_id": "node_3424",
      "content": "MODIFICATION: Increase 1 thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n\nPerformance:\n  Mass: 293.22 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.22087956907814,
      "fos_buckling": 1.5229251419253977,
      "fos_yielding": 2.0124263092809658,
      "deflection": 0.004040787738751757,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.215)"
      },
      "parent_node_id": "node_3423",
      "improvement_over_parent": null
    },
    "node_3425": {
      "node_id": "node_3425",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3424",
      "improvement_over_parent": null
    },
    "node_3426": {
      "node_id": "node_3426",
      "content": "INITIAL DESIGN (Trace 492)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 158.89 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.14e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 158.88771204424742,
      "fos_buckling": 0.42713144355587784,
      "fos_yielding": 1.2350889871333715,
      "deflection": 0.011421264209367852,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3427": {
      "node_id": "node_3427",
      "content": "MODIFICATION: Increase 7 thickness by 46%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 169.02 kg\n  Factor of Safety: 0.43\n  Max Deflection: 1.06e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 169.02265768064706,
      "fos_buckling": 0.4268329472108793,
      "fos_yielding": 1.2348210577593017,
      "deflection": 0.010552843679979496,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.458)"
      },
      "parent_node_id": "node_3426",
      "improvement_over_parent": null
    },
    "node_3428": {
      "node_id": "node_3428",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 203.95 kg\n  Factor of Safety: 0.82\n  Max Deflection: 6.37e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 203.9463832567998,
      "fos_buckling": 0.8230602340275033,
      "fos_yielding": 1.5679405929229773,
      "deflection": 0.0063683910014055356,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004806)"
      },
      "parent_node_id": "node_3427",
      "improvement_over_parent": null
    },
    "node_3429": {
      "node_id": "node_3429",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 260.42 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.00e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 260.4240037265513,
      "fos_buckling": 1.0076602055233004,
      "fos_yielding": 1.9994090297682594,
      "deflection": 0.0050047977551634145,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_3428",
      "improvement_over_parent": null
    },
    "node_3430": {
      "node_id": "node_3430",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.34 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3365403581683,
      "fos_buckling": 1.5232962323917827,
      "fos_yielding": 2.0132004737679896,
      "deflection": 0.0040391294354945925,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_3429",
      "improvement_over_parent": null
    },
    "node_3431": {
      "node_id": "node_3431",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3430",
      "improvement_over_parent": null
    },
    "node_3432": {
      "node_id": "node_3432",
      "content": "INITIAL DESIGN (Trace 493)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0025)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 131.84 kg\n  Factor of Safety: 0.47\n  Max Deflection: 1.02e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 131.84325301734773,
      "fos_buckling": 0.47153105429382053,
      "fos_yielding": 1.0820281098575735,
      "deflection": 0.010179802377523172,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3433": {
      "node_id": "node_3433",
      "content": "MODIFICATION: Increase 7 thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0029)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0023)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0022)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0032)]\n\nPerformance:\n  Mass: 136.86 kg\n  Factor of Safety: 0.59\n  Max Deflection: 9.36e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 136.8578452436574,
      "fos_buckling": 0.5901598747107513,
      "fos_yielding": 1.0819751218013791,
      "deflection": 0.009357795306539376,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(7, thickness, 1.289)"
      },
      "parent_node_id": "node_3432",
      "improvement_over_parent": null
    },
    "node_3434": {
      "node_id": "node_3434",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n\nPerformance:\n  Mass: 165.10 kg\n  Factor of Safety: 0.70\n  Max Deflection: 7.77e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 165.09752113833008,
      "fos_buckling": 0.6974119130543032,
      "fos_yielding": 1.3040691813974334,
      "deflection": 0.007771480426886842,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.218)"
      },
      "parent_node_id": "node_3433",
      "improvement_over_parent": null
    },
    "node_3435": {
      "node_id": "node_3435",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0036)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0039)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n\nPerformance:\n  Mass: 186.37 kg\n  Factor of Safety: 1.03\n  Max Deflection: 6.28e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 186.36692462973804,
      "fos_buckling": 1.030701530448208,
      "fos_yielding": 1.312799120046475,
      "deflection": 0.0062770721168634675,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003364)"
      },
      "parent_node_id": "node_3434",
      "improvement_over_parent": null
    },
    "node_3436": {
      "node_id": "node_3436",
      "content": "MODIFICATION: Increase all_members thickness by 24%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n\nPerformance:\n  Mass: 227.41 kg\n  Factor of Safety: 1.22\n  Max Deflection: 5.16e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 227.40864869749672,
      "fos_buckling": 1.2245765528839503,
      "fos_yielding": 1.6000210940884547,
      "deflection": 0.005156923012970237,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.236)"
      },
      "parent_node_id": "node_3435",
      "improvement_over_parent": null
    },
    "node_3437": {
      "node_id": "node_3437",
      "content": "MODIFICATION: Increase 9 thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0039)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0038)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0030)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0026)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0048)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0034)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0058)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0042)]\n\nPerformance:\n  Mass: 233.96 kg\n  Factor of Safety: 1.26\n  Max Deflection: 5.01e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 233.95615694683642,
      "fos_buckling": 1.2582309930987357,
      "fos_yielding": 1.6143990759613533,
      "deflection": 0.0050064163718848064,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.203)"
      },
      "parent_node_id": "node_3436",
      "improvement_over_parent": null
    },
    "node_3438": {
      "node_id": "node_3438",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0038)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0067)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n\nPerformance:\n  Mass: 265.57 kg\n  Factor of Safety: 1.40\n  Max Deflection: 4.42e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 265.5682290748679,
      "fos_buckling": 1.3993685384976113,
      "fos_yielding": 1.8314445942765258,
      "deflection": 0.004418817549036287,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.147)"
      },
      "parent_node_id": "node_3437",
      "improvement_over_parent": null
    },
    "node_3439": {
      "node_id": "node_3439",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M9: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0075)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 296.67 kg\n  Factor of Safety: 1.53\n  Max Deflection: 3.96e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 296.6679370432372,
      "fos_buckling": 1.531614933742466,
      "fos_yielding": 2.0447223518798494,
      "deflection": 0.003962950383852102,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.129)"
      },
      "parent_node_id": "node_3438",
      "improvement_over_parent": null
    },
    "node_3440": {
      "node_id": "node_3440",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3439",
      "improvement_over_parent": null
    },
    "node_3441": {
      "node_id": "node_3441",
      "content": "INITIAL DESIGN (Trace 494)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0049)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0025)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0028)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0052)]\n\nPerformance:\n  Mass: 180.02 kg\n  Factor of Safety: 0.88\n  Max Deflection: 7.46e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 180.01713136839686,
      "fos_buckling": 0.8813495990662554,
      "fos_yielding": 1.9396012839408836,
      "deflection": 0.007462971721641671,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3442": {
      "node_id": "node_3442",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0030)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 212.83 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.33e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 212.82644399832392,
      "fos_buckling": 1.0108288436855943,
      "fos_yielding": 2.290424955092544,
      "deflection": 0.006325868553377985,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.199)"
      },
      "parent_node_id": "node_3441",
      "improvement_over_parent": null
    },
    "node_3443": {
      "node_id": "node_3443",
      "content": "MODIFICATION: Increase 3 thickness by 62%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0043)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 221.65 kg\n  Factor of Safety: 1.01\n  Max Deflection: 6.33e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 221.6543848725254,
      "fos_buckling": 1.010215651992368,
      "fos_yielding": 2.2891684269884025,
      "deflection": 0.006329703695006829,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(3, thickness, 1.621)"
      },
      "parent_node_id": "node_3442",
      "improvement_over_parent": null
    },
    "node_3444": {
      "node_id": "node_3444",
      "content": "MODIFICATION: Increase 0 thickness by 33%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 229.48 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.92e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.47862358907665,
      "fos_buckling": 1.0096727993326433,
      "fos_yielding": 2.2891684269884025,
      "deflection": 0.005918767442411825,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.328)"
      },
      "parent_node_id": "node_3443",
      "improvement_over_parent": null
    },
    "node_3445": {
      "node_id": "node_3445",
      "content": "MODIFICATION: Add member connecting joints 1 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n\nPerformance:\n  Mass: 253.88 kg\n  Factor of Safety: 1.01\n  Max Deflection: 5.07e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 253.88190663762717,
      "fos_buckling": 1.0079834190148627,
      "fos_yielding": 2.0187804817618593,
      "deflection": 0.005068810664443813,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004030)"
      },
      "parent_node_id": "node_3444",
      "improvement_over_parent": null
    },
    "node_3446": {
      "node_id": "node_3446",
      "content": "MODIFICATION: Add member connecting joints 1 and 3\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 286.79 kg\n  Factor of Safety: 1.48\n  Max Deflection: 4.10e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 286.7944432692442,
      "fos_buckling": 1.478522749794944,
      "fos_yielding": 2.0318503872321094,
      "deflection": 0.004096897134762674,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)"
      },
      "parent_node_id": "node_3445",
      "improvement_over_parent": null
    },
    "node_3447": {
      "node_id": "node_3447",
      "content": "MODIFICATION: Increase 9 thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n\nPerformance:\n  Mass: 293.35 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.3527170763311,
      "fos_buckling": 1.5234200540170888,
      "fos_yielding": 2.013426050017802,
      "deflection": 0.004038777141268125,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(9, thickness, 1.295)"
      },
      "parent_node_id": "node_3446",
      "improvement_over_parent": null
    },
    "node_3448": {
      "node_id": "node_3448",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3447",
      "improvement_over_parent": null
    },
    "node_3449": {
      "node_id": "node_3449",
      "content": "INITIAL DESIGN (Trace 495)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0030)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0019)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0026)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0020)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0011)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0024)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0032)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0028)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0027)]\n\nPerformance:\n  Mass: 128.18 kg\n  Factor of Safety: 0.31\n  Max Deflection: 1.43e-02 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 128.18187393876224,
      "fos_buckling": 0.31180674171334627,
      "fos_yielding": 0.7462911151049386,
      "deflection": 0.01432615791116565,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3450": {
      "node_id": "node_3450",
      "content": "MODIFICATION: Increase all_members thickness by 20%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0023)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0032)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0031)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0024)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0013)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0029)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0039)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0034)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0033)]\n\nPerformance:\n  Mass: 151.99 kg\n  Factor of Safety: 0.36\n  Max Deflection: 1.21e-02 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 151.98729238841216,
      "fos_buckling": 0.36274864412039526,
      "fos_yielding": 0.8870746604821867,
      "deflection": 0.01209702337051895,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.196)"
      },
      "parent_node_id": "node_3449",
      "improvement_over_parent": null
    },
    "node_3451": {
      "node_id": "node_3451",
      "content": "MODIFICATION: Increase all_members thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0030)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 196.95 kg\n  Factor of Safety: 0.45\n  Max Deflection: 9.36e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 196.947865607709,
      "fos_buckling": 0.45310327224854274,
      "fos_yielding": 1.1551576840556066,
      "deflection": 0.00935693594445177,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.318)"
      },
      "parent_node_id": "node_3450",
      "improvement_over_parent": null
    },
    "node_3452": {
      "node_id": "node_3452",
      "content": "MODIFICATION: Increase 1 thickness by 62%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0048)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0042)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0032)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0017)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0038)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0051)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0045)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n\nPerformance:\n  Mass: 207.75 kg\n  Factor of Safety: 0.45\n  Max Deflection: 9.36e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 207.74599620122058,
      "fos_buckling": 0.4527667526175729,
      "fos_yielding": 1.1555269773630417,
      "deflection": 0.00936193719955836,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.621)"
      },
      "parent_node_id": "node_3451",
      "improvement_over_parent": null
    },
    "node_3453": {
      "node_id": "node_3453",
      "content": "MODIFICATION: Increase all_members thickness by 21%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n\nPerformance:\n  Mass: 246.73 kg\n  Factor of Safety: 0.52\n  Max Deflection: 7.89e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 246.7326606277492,
      "fos_buckling": 0.5214888623252129,
      "fos_yielding": 1.3792557851063085,
      "deflection": 0.00789363271175355,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.206)"
      },
      "parent_node_id": "node_3452",
      "improvement_over_parent": null
    },
    "node_3454": {
      "node_id": "node_3454",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0021)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 291.31 kg\n  Factor of Safety: 1.32\n  Max Deflection: 4.14e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 291.3145917956951,
      "fos_buckling": 1.3218540380302406,
      "fos_yielding": 2.0245863783853926,
      "deflection": 0.004136418744187012,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)"
      },
      "parent_node_id": "node_3453",
      "improvement_over_parent": null
    },
    "node_3455": {
      "node_id": "node_3455",
      "content": "MODIFICATION: Increase 5 thickness by 58%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.13 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.12740846224494,
      "fos_buckling": 1.5225129364461307,
      "fos_yielding": 2.0115664790778283,
      "deflection": 0.004041898347632924,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.585)"
      },
      "parent_node_id": "node_3454",
      "improvement_over_parent": null
    },
    "node_3456": {
      "node_id": "node_3456",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3455",
      "improvement_over_parent": null
    },
    "node_3457": {
      "node_id": "node_3457",
      "content": "INITIAL DESIGN (Trace 496)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0034)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0035)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0023)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0029)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0023)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0014)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0027)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0037)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0023)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0031)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0037)]\n\nPerformance:\n  Mass: 171.52 kg\n  Factor of Safety: 0.93\n  Max Deflection: 6.81e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 171.52377974572863,
      "fos_buckling": 0.9327543747911549,
      "fos_yielding": 1.2536864336320637,
      "deflection": 0.006807607343288498,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3458": {
      "node_id": "node_3458",
      "content": "MODIFICATION: Increase all_members thickness by 12%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0026)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0033)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0016)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0026)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 190.96 kg\n  Factor of Safety: 1.03\n  Max Deflection: 6.12e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 190.95583033302995,
      "fos_buckling": 1.0251707459663244,
      "fos_yielding": 1.3946376123027462,
      "deflection": 0.0061217800787998836,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.120)"
      },
      "parent_node_id": "node_3457",
      "improvement_over_parent": null
    },
    "node_3459": {
      "node_id": "node_3459",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0031)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 230.79 kg\n  Factor of Safety: 1.21\n  Max Deflection: 5.08e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 230.7850591154861,
      "fos_buckling": 1.206307965940427,
      "fos_yielding": 1.6828156656159317,
      "deflection": 0.005077041481733108,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.224)"
      },
      "parent_node_id": "node_3458",
      "improvement_over_parent": null
    },
    "node_3460": {
      "node_id": "node_3460",
      "content": "MODIFICATION: Increase 2 thickness by 31%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0032)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 235.59 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.02e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 235.58896100892514,
      "fos_buckling": 1.2356763925485221,
      "fos_yielding": 1.6835859724871973,
      "deflection": 0.005020668149217521,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(2, thickness, 1.309)"
      },
      "parent_node_id": "node_3459",
      "improvement_over_parent": null
    },
    "node_3461": {
      "node_id": "node_3461",
      "content": "MODIFICATION: Increase 8 thickness by 39%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 242.89 kg\n  Factor of Safety: 1.21\n  Max Deflection: 4.92e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 242.88845769374507,
      "fos_buckling": 1.211293461024271,
      "fos_yielding": 1.6848750355264797,
      "deflection": 0.004923387851343762,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.391)"
      },
      "parent_node_id": "node_3460",
      "improvement_over_parent": null
    },
    "node_3462": {
      "node_id": "node_3462",
      "content": "MODIFICATION: Increase 5 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0047)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0048)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0041)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0040)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0031)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0027)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0037)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0050)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0044)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0043)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0051)]\n\nPerformance:\n  Mass: 244.09 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.84e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 244.08826656685022,
      "fos_buckling": 1.309511331039949,
      "fos_yielding": 1.6769774163386262,
      "deflection": 0.004840583516169852,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.412)"
      },
      "parent_node_id": "node_3461",
      "improvement_over_parent": null
    },
    "node_3463": {
      "node_id": "node_3463",
      "content": "MODIFICATION: Increase all_members thickness by 22%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.21 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2075442354688,
      "fos_buckling": 1.5226737861536188,
      "fos_yielding": 2.012218521240326,
      "deflection": 0.0040411600564355075,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.221)"
      },
      "parent_node_id": "node_3462",
      "improvement_over_parent": null
    },
    "node_3464": {
      "node_id": "node_3464",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3463",
      "improvement_over_parent": null
    },
    "node_3465": {
      "node_id": "node_3465",
      "content": "INITIAL DESIGN (Trace 497)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (7 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n\nPerformance:\n  Mass: 129.95 kg\n  Factor of Safety: 1.42\n  Max Deflection: 5.12e+14 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 129.95343760690042,
      "fos_buckling": 1.4218403630597631,
      "fos_yielding": 1.6754255244877145,
      "deflection": 511793813461793.8,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3466": {
      "node_id": "node_3466",
      "content": "MODIFICATION: Add member connecting joints 2 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0028)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0040)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0042)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0037)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0036)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0043)]\n\nPerformance:\n  Mass: 161.50 kg\n  Factor of Safety: 0.76\n  Max Deflection: 1.35e+12 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 161.50051010079167,
      "fos_buckling": 0.7618193093106533,
      "fos_yielding": 1.6019096722407828,
      "deflection": 1349353094066.735,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004311)"
      },
      "parent_node_id": "node_3465",
      "improvement_over_parent": null
    },
    "node_3467": {
      "node_id": "node_3467",
      "content": "MODIFICATION: Increase all_members thickness by 29%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (8 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n\nPerformance:\n  Mass: 204.78 kg\n  Factor of Safety: 0.93\n  Max Deflection: 3.83e+11 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 204.7803724491872,
      "fos_buckling": 0.9321542559673839,
      "fos_yielding": 2.045827160792593,
      "deflection": 382881912698.7177,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.290)"
      },
      "parent_node_id": "node_3466",
      "improvement_over_parent": null
    },
    "node_3468": {
      "node_id": "node_3468",
      "content": "MODIFICATION: Add member connecting joints 3 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0036)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n\nPerformance:\n  Mass: 228.01 kg\n  Factor of Safety: 0.94\n  Max Deflection: 7.12e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 228.00828810231548,
      "fos_buckling": 0.9365003456440137,
      "fos_yielding": 2.051557179739623,
      "deflection": 0.007122933517523076,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004450)"
      },
      "parent_node_id": "node_3467",
      "improvement_over_parent": null
    },
    "node_3469": {
      "node_id": "node_3469",
      "content": "MODIFICATION: Increase 0 thickness by 41%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n\nPerformance:\n  Mass: 236.39 kg\n  Factor of Safety: 0.94\n  Max Deflection: 6.54e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 236.39021114611006,
      "fos_buckling": 0.9370482963443582,
      "fos_yielding": 2.051557179739623,
      "deflection": 0.006542425465100976,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.412)"
      },
      "parent_node_id": "node_3468",
      "improvement_over_parent": null
    },
    "node_3470": {
      "node_id": "node_3470",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n\nPerformance:\n  Mass: 258.26 kg\n  Factor of Safety: 0.95\n  Max Deflection: 6.55e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 258.2597826826956,
      "fos_buckling": 0.9479435214058091,
      "fos_yielding": 2.060698086377503,
      "deflection": 0.006550984146754359,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004318)"
      },
      "parent_node_id": "node_3469",
      "improvement_over_parent": null
    },
    "node_3471": {
      "node_id": "node_3471",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0051)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0052)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0034)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0041)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0055)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0048)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0046)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0056)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0043)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0029)]\n\nPerformance:\n  Mass: 262.94 kg\n  Factor of Safety: 1.39\n  Max Deflection: 4.50e-03 m\n  Status: INFEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 262.93573202280595,
      "fos_buckling": 1.3934786369467937,
      "fos_yielding": 1.8059077575716063,
      "deflection": 0.0044984280648822025,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002935)"
      },
      "parent_node_id": "node_3470",
      "improvement_over_parent": null
    },
    "node_3472": {
      "node_id": "node_3472",
      "content": "MODIFICATION: Increase all_members thickness by 13%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M3: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M4: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M5: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M6: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M7: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M8: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M9: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M10: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n\nPerformance:\n  Mass: 293.09 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 7,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.08583834428913,
      "fos_buckling": 1.5223878223149476,
      "fos_yielding": 2.011617458490494,
      "deflection": 0.004042726307459555,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.126)"
      },
      "parent_node_id": "node_3471",
      "improvement_over_parent": null
    },
    "node_3473": {
      "node_id": "node_3473",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 8,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3472",
      "improvement_over_parent": null
    },
    "node_3474": {
      "node_id": "node_3474",
      "content": "INITIAL DESIGN (Trace 498)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0027)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 206.61 kg\n  Factor of Safety: 1.18\n  Max Deflection: 5.91e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 206.60783023863428,
      "fos_buckling": 1.1769704340606026,
      "fos_yielding": 1.5384617916013463,
      "deflection": 0.005906390979423802,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3475": {
      "node_id": "node_3475",
      "content": "MODIFICATION: Increase 1 thickness by 63%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0032)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 216.76 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.49e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 216.76184616369574,
      "fos_buckling": 1.243276447188448,
      "fos_yielding": 1.5784104755150508,
      "deflection": 0.0054943710280459255,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(1, thickness, 1.629)"
      },
      "parent_node_id": "node_3474",
      "improvement_over_parent": null
    },
    "node_3476": {
      "node_id": "node_3476",
      "content": "MODIFICATION: Increase 0 thickness by 37%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0031)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 223.59 kg\n  Factor of Safety: 1.20\n  Max Deflection: 5.24e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 223.59337317834365,
      "fos_buckling": 1.198549440525217,
      "fos_yielding": 1.5770083732748728,
      "deflection": 0.0052359292907737855,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(0, thickness, 1.370)"
      },
      "parent_node_id": "node_3475",
      "improvement_over_parent": null
    },
    "node_3477": {
      "node_id": "node_3477",
      "content": "MODIFICATION: Increase 8 thickness by 32%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0044)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0045)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0038)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0037)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0029)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0025)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0035)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0047)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0041)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0040)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0048)]\n\nPerformance:\n  Mass: 229.59 kg\n  Factor of Safety: 1.24\n  Max Deflection: 5.14e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 229.5906046750522,
      "fos_buckling": 1.2434900040368082,
      "fos_yielding": 1.5777803215228807,
      "deflection": 0.005141709032919119,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(8, thickness, 1.325)"
      },
      "parent_node_id": "node_3476",
      "improvement_over_parent": null
    },
    "node_3478": {
      "node_id": "node_3478",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.17 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.17405202291013,
      "fos_buckling": 1.5226283739729125,
      "fos_yielding": 2.011855688429408,
      "deflection": 0.004041457185264927,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_3477",
      "improvement_over_parent": null
    },
    "node_3479": {
      "node_id": "node_3479",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3478",
      "improvement_over_parent": null
    },
    "node_3480": {
      "node_id": "node_3480",
      "content": "INITIAL DESIGN (Trace 499)\n\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (9 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n\nPerformance:\n  Mass: 181.33 kg\n  Factor of Safety: 0.75\n  Max Deflection: 8.51e-03 m\n  Status: INFEASIBLE",
      "depth": 0,
      "node_type": "state",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 181.3285044705791,
      "fos_buckling": 0.745093840978901,
      "fos_yielding": 1.5743819713681684,
      "deflection": 0.008514455191266148,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": null,
      "parent_node_id": null,
      "improvement_over_parent": null
    },
    "node_3481": {
      "node_id": "node_3481",
      "content": "MODIFICATION: Add member connecting joints 1 and 4\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (10 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n\nPerformance:\n  Mass: 183.77 kg\n  Factor of Safety: 0.78\n  Max Deflection: 7.05e-03 m\n  Status: INFEASIBLE",
      "depth": 1,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 183.7686230654568,
      "fos_buckling": 0.7833536511876529,
      "fos_yielding": 1.574381971368169,
      "deflection": 0.0070545195309155385,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001473)"
      },
      "parent_node_id": "node_3480",
      "improvement_over_parent": null
    },
    "node_3482": {
      "node_id": "node_3482",
      "content": "MODIFICATION: Add member connecting joints 4 and 5\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0041)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n\nPerformance:\n  Mass: 200.54 kg\n  Factor of Safety: 0.97\n  Max Deflection: 5.97e-03 m\n  Status: INFEASIBLE",
      "depth": 2,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 200.53976227814155,
      "fos_buckling": 0.9709207939925415,
      "fos_yielding": 1.395012863428335,
      "deflection": 0.005965769428426044,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003247)"
      },
      "parent_node_id": "node_3481",
      "improvement_over_parent": null
    },
    "node_3483": {
      "node_id": "node_3483",
      "content": "MODIFICATION: Increase 5 thickness by 50%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0038)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0039)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0033)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0026)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0031)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0036)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0035)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0042)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0015)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0032)]\n\nPerformance:\n  Mass: 214.06 kg\n  Factor of Safety: 1.04\n  Max Deflection: 5.63e-03 m\n  Status: INFEASIBLE",
      "depth": 3,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 214.05617542840957,
      "fos_buckling": 1.0449842284700057,
      "fos_yielding": 1.3928403743067337,
      "deflection": 0.0056312790060867495,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(5, thickness, 1.499)"
      },
      "parent_node_id": "node_3482",
      "improvement_over_parent": null
    },
    "node_3484": {
      "node_id": "node_3484",
      "content": "MODIFICATION: Increase all_members thickness by 30%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0050)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0051)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0044)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0033)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0040)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0080)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0047)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0045)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0055)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0019)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0042)]\n\nPerformance:\n  Mass: 273.60 kg\n  Factor of Safety: 1.31\n  Max Deflection: 4.42e-03 m\n  Status: INFEASIBLE",
      "depth": 4,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 273.6000815816441,
      "fos_buckling": 1.3146375622502358,
      "fos_yielding": 1.7812716980795866,
      "deflection": 0.004416735892325854,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.304)"
      },
      "parent_node_id": "node_3483",
      "improvement_over_parent": null
    },
    "node_3485": {
      "node_id": "node_3485",
      "content": "MODIFICATION: Increase all_members thickness by 15%\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M4: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M5: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0092)]\n  M6: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M7: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M8: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n  M9: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0022)]\n  M10: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n\nPerformance:\n  Mass: 310.31 kg\n  Factor of Safety: 1.48\n  Max Deflection: 3.90e-03 m\n  Status: INFEASIBLE",
      "depth": 5,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": false,
      "mass": 310.30607951489196,
      "fos_buckling": 1.4760903816532658,
      "fos_yielding": 2.0210982050583715,
      "deflection": 0.0039001547708863524,
      "is_feasible": false,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "SCALE_PARAM(all_members, thickness, 1.149)"
      },
      "parent_node_id": "node_3484",
      "improvement_over_parent": null
    },
    "node_3486": {
      "node_id": "node_3486",
      "content": "MODIFICATION: Optimal solution\n\nResulting Structure:\nJoints (6 total):\n  J0: pos=(0.00, 0.00) [pinned]\n  J1: pos=(3.80, 0.00) [free]\n  J2: pos=(7.60, 0.00) [roller]\n  J3: pos=(0.00, 1.76) [free]\n  J4: pos=(3.80, 1.76) [free]\n  J5: pos=(7.60, 1.76) [free]\n\nMembers (11 total):\n  M0: J0-J1 [A36_Steel, Pipe(r=0.0344, t=0.0057)]\n  M1: J1-J2 [A36_Steel, Pipe(r=0.0350, t=0.0058)]\n  M2: J3-J4 [A36_Steel, Pipe(r=0.0301, t=0.0050)]\n  M3: J4-J5 [A36_Steel, Pipe(r=0.0292, t=0.0049)]\n  M4: J0-J3 [A36_Steel, Pipe(r=0.0231, t=0.0038)]\n  M5: J1-J4 [A36_Steel, Pipe(r=0.0198, t=0.0033)]\n  M6: J2-J5 [A36_Steel, Pipe(r=0.0274, t=0.0046)]\n  M7: J0-J4 [A36_Steel, Pipe(r=0.0370, t=0.0062)]\n  M8: J1-J3 [A36_Steel, Pipe(r=0.0323, t=0.0054)]\n  M9: J1-J5 [A36_Steel, Pipe(r=0.0313, t=0.0052)]\n  M10: J2-J4 [A36_Steel, Pipe(r=0.0376, t=0.0063)]\n\nPerformance:\n  Mass: 293.23 kg\n  Factor of Safety: 1.52\n  Max Deflection: 4.04e-03 m\n  Status: FEASIBLE",
      "depth": 6,
      "node_type": "modification_result",
      "metadata": null,
      "correctness_score": 1.0,
      "is_on_solution_path": true,
      "mass": 293.2250801848636,
      "fos_buckling": 1.5228854124434206,
      "fos_yielding": 2.0124409061380586,
      "deflection": 0.004040707014545659,
      "is_feasible": true,
      "joint_positions": null,
      "member_dimensions": null,
      "modification_action": {
        "raw": "OPTIMAL_STATE"
      },
      "parent_node_id": "node_3485",
      "improvement_over_parent": null
    }
  },
  "edges": [
    {
      "from_node": "node_0",
      "to_node": "node_1",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004158)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1",
      "to_node": "node_2",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004465)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2",
      "to_node": "node_3",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3",
      "to_node": "node_4",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_5",
      "to_node": "node_6",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_6",
      "to_node": "node_7",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_7",
      "to_node": "node_8",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003935)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_8",
      "to_node": "node_9",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004100)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_9",
      "to_node": "node_10",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_10",
      "to_node": "node_11",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_11",
      "to_node": "node_12",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_12",
      "to_node": "node_13",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_14",
      "to_node": "node_15",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001830)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_15",
      "to_node": "node_16",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.264)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_16",
      "to_node": "node_17",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_17",
      "to_node": "node_18",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.168)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_18",
      "to_node": "node_19",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_20",
      "to_node": "node_21",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.208)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_21",
      "to_node": "node_22",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002878)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_22",
      "to_node": "node_23",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_23",
      "to_node": "node_24",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_24",
      "to_node": "node_25",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_25",
      "to_node": "node_26",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_27",
      "to_node": "node_28",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.181)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_28",
      "to_node": "node_29",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_29",
      "to_node": "node_30",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004609)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_30",
      "to_node": "node_31",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.168)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_31",
      "to_node": "node_32",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_33",
      "to_node": "node_34",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003973)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_34",
      "to_node": "node_35",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.590)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_35",
      "to_node": "node_36",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_36",
      "to_node": "node_37",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_37",
      "to_node": "node_38",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_39",
      "to_node": "node_40",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003158)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_40",
      "to_node": "node_41",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_41",
      "to_node": "node_42",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_42",
      "to_node": "node_43",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.256)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_43",
      "to_node": "node_44",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_45",
      "to_node": "node_46",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.168)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_46",
      "to_node": "node_47",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.326)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_47",
      "to_node": "node_48",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.590)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_48",
      "to_node": "node_49",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003127)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_49",
      "to_node": "node_50",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_50",
      "to_node": "node_51",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_51",
      "to_node": "node_52",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.185)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_52",
      "to_node": "node_53",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_54",
      "to_node": "node_55",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.425)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_55",
      "to_node": "node_56",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.244)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_56",
      "to_node": "node_57",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.200)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_57",
      "to_node": "node_58",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.420)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_58",
      "to_node": "node_59",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_59",
      "to_node": "node_60",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_61",
      "to_node": "node_62",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_62",
      "to_node": "node_63",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_63",
      "to_node": "node_64",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.179)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_64",
      "to_node": "node_65",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_65",
      "to_node": "node_66",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.289)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_66",
      "to_node": "node_67",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_68",
      "to_node": "node_69",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_69",
      "to_node": "node_70",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003086)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_70",
      "to_node": "node_71",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.316)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_71",
      "to_node": "node_72",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002760)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_72",
      "to_node": "node_73",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004492)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_73",
      "to_node": "node_74",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_74",
      "to_node": "node_75",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_76",
      "to_node": "node_77",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001590)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_77",
      "to_node": "node_78",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002511)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_78",
      "to_node": "node_79",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.302)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_79",
      "to_node": "node_80",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_80",
      "to_node": "node_81",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_81",
      "to_node": "node_82",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.610)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_82",
      "to_node": "node_83",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_84",
      "to_node": "node_85",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 51%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.511)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_85",
      "to_node": "node_86",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_86",
      "to_node": "node_87",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_87",
      "to_node": "node_88",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_89",
      "to_node": "node_90",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002649)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_90",
      "to_node": "node_91",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.152)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_91",
      "to_node": "node_92",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.256)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_92",
      "to_node": "node_93",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_93",
      "to_node": "node_94",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_94",
      "to_node": "node_95",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_96",
      "to_node": "node_97",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005585)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_97",
      "to_node": "node_98",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.541)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_98",
      "to_node": "node_99",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_99",
      "to_node": "node_100",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.302)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_100",
      "to_node": "node_101",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_102",
      "to_node": "node_103",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_103",
      "to_node": "node_104",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.312)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_104",
      "to_node": "node_105",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_105",
      "to_node": "node_106",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.393)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_106",
      "to_node": "node_107",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.318)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_107",
      "to_node": "node_108",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_108",
      "to_node": "node_109",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_109",
      "to_node": "node_110",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_111",
      "to_node": "node_112",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003597)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_112",
      "to_node": "node_113",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003090)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_113",
      "to_node": "node_114",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.172)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_114",
      "to_node": "node_115",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_115",
      "to_node": "node_116",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_116",
      "to_node": "node_117",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_117",
      "to_node": "node_118",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.502)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_118",
      "to_node": "node_119",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_120",
      "to_node": "node_121",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.361)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_121",
      "to_node": "node_122",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.290)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_122",
      "to_node": "node_123",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_123",
      "to_node": "node_124",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.379)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_124",
      "to_node": "node_125",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.264)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_125",
      "to_node": "node_126",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_127",
      "to_node": "node_128",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_128",
      "to_node": "node_129",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001723)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_129",
      "to_node": "node_130",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.634)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_130",
      "to_node": "node_131",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.340)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_131",
      "to_node": "node_132",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.175)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_132",
      "to_node": "node_133",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_133",
      "to_node": "node_134",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_135",
      "to_node": "node_136",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_136",
      "to_node": "node_137",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_137",
      "to_node": "node_138",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_138",
      "to_node": "node_139",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_139",
      "to_node": "node_140",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_140",
      "to_node": "node_141",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_142",
      "to_node": "node_143",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.155)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_143",
      "to_node": "node_144",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.328)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_144",
      "to_node": "node_145",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002565)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_145",
      "to_node": "node_146",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.639)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_146",
      "to_node": "node_147",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.157)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_147",
      "to_node": "node_148",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_148",
      "to_node": "node_149",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_150",
      "to_node": "node_151",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.439)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_151",
      "to_node": "node_152",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.656)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_152",
      "to_node": "node_153",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002499)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_153",
      "to_node": "node_154",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_154",
      "to_node": "node_155",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.447)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_155",
      "to_node": "node_156",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004662)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_156",
      "to_node": "node_157",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_157",
      "to_node": "node_158",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_159",
      "to_node": "node_160",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.149)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_160",
      "to_node": "node_161",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_161",
      "to_node": "node_162",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_162",
      "to_node": "node_163",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.359)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_163",
      "to_node": "node_164",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_165",
      "to_node": "node_166",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.140)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_166",
      "to_node": "node_167",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_167",
      "to_node": "node_168",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_168",
      "to_node": "node_169",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005021)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_169",
      "to_node": "node_170",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_170",
      "to_node": "node_171",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_172",
      "to_node": "node_173",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_173",
      "to_node": "node_174",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_174",
      "to_node": "node_175",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_175",
      "to_node": "node_176",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_176",
      "to_node": "node_177",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.255)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_177",
      "to_node": "node_178",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_179",
      "to_node": "node_180",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.195)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_180",
      "to_node": "node_181",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.416)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_181",
      "to_node": "node_182",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_182",
      "to_node": "node_183",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.479)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_183",
      "to_node": "node_184",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_184",
      "to_node": "node_185",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.546)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_185",
      "to_node": "node_186",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_187",
      "to_node": "node_188",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_188",
      "to_node": "node_189",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.441)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_189",
      "to_node": "node_190",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_190",
      "to_node": "node_191",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_191",
      "to_node": "node_192",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_192",
      "to_node": "node_193",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_194",
      "to_node": "node_195",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.153)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_195",
      "to_node": "node_196",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_196",
      "to_node": "node_197",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005070)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_197",
      "to_node": "node_198",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.188)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_198",
      "to_node": "node_199",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.217)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_199",
      "to_node": "node_200",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_201",
      "to_node": "node_202",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.256)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_202",
      "to_node": "node_203",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.287)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_203",
      "to_node": "node_204",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_204",
      "to_node": "node_205",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.326)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_205",
      "to_node": "node_206",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_207",
      "to_node": "node_208",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_208",
      "to_node": "node_209",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_209",
      "to_node": "node_210",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.357)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_210",
      "to_node": "node_211",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_211",
      "to_node": "node_212",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_213",
      "to_node": "node_214",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.458)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_214",
      "to_node": "node_215",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003769)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_215",
      "to_node": "node_216",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.404)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_216",
      "to_node": "node_217",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002486)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_217",
      "to_node": "node_218",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.330)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_218",
      "to_node": "node_219",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_220",
      "to_node": "node_221",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005014)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_221",
      "to_node": "node_222",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.608)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_222",
      "to_node": "node_223",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 60%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.603)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_223",
      "to_node": "node_224",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004246)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_224",
      "to_node": "node_225",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.230)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_225",
      "to_node": "node_226",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.206)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_226",
      "to_node": "node_227",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_227",
      "to_node": "node_228",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_229",
      "to_node": "node_230",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_230",
      "to_node": "node_231",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.395)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_231",
      "to_node": "node_232",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_232",
      "to_node": "node_233",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_233",
      "to_node": "node_234",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_235",
      "to_node": "node_236",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_236",
      "to_node": "node_237",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_237",
      "to_node": "node_238",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_238",
      "to_node": "node_239",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_240",
      "to_node": "node_241",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.127)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_241",
      "to_node": "node_242",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.147)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_242",
      "to_node": "node_243",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.168)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_243",
      "to_node": "node_244",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.238)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_244",
      "to_node": "node_245",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_246",
      "to_node": "node_247",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_247",
      "to_node": "node_248",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.159)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_248",
      "to_node": "node_249",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_249",
      "to_node": "node_250",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.353)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_250",
      "to_node": "node_251",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_251",
      "to_node": "node_252",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_253",
      "to_node": "node_254",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_254",
      "to_node": "node_255",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.217)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_255",
      "to_node": "node_256",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_256",
      "to_node": "node_257",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.318)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_257",
      "to_node": "node_258",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_258",
      "to_node": "node_259",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.182)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_259",
      "to_node": "node_260",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_260",
      "to_node": "node_261",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_262",
      "to_node": "node_263",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_263",
      "to_node": "node_264",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004632)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_264",
      "to_node": "node_265",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.127)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_265",
      "to_node": "node_266",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_266",
      "to_node": "node_267",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.522)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_267",
      "to_node": "node_268",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_269",
      "to_node": "node_270",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_270",
      "to_node": "node_271",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_271",
      "to_node": "node_272",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_272",
      "to_node": "node_273",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_274",
      "to_node": "node_275",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002817)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_275",
      "to_node": "node_276",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.527)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_276",
      "to_node": "node_277",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005254)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_277",
      "to_node": "node_278",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005337)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_278",
      "to_node": "node_279",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_279",
      "to_node": "node_280",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_281",
      "to_node": "node_282",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.166)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_282",
      "to_node": "node_283",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002612)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_283",
      "to_node": "node_284",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.387)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_284",
      "to_node": "node_285",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_285",
      "to_node": "node_286",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.289)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_286",
      "to_node": "node_287",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_287",
      "to_node": "node_288",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_289",
      "to_node": "node_290",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.161)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_290",
      "to_node": "node_291",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.410)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_291",
      "to_node": "node_292",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_292",
      "to_node": "node_293",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003351)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_293",
      "to_node": "node_294",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_294",
      "to_node": "node_295",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.139)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_295",
      "to_node": "node_296",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_297",
      "to_node": "node_298",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_298",
      "to_node": "node_299",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003860)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_299",
      "to_node": "node_300",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.185)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_300",
      "to_node": "node_301",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 60%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.603)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_301",
      "to_node": "node_302",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_302",
      "to_node": "node_303",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_303",
      "to_node": "node_304",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_305",
      "to_node": "node_306",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.406)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_306",
      "to_node": "node_307",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.610)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_307",
      "to_node": "node_308",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003971)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_308",
      "to_node": "node_309",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_309",
      "to_node": "node_310",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_311",
      "to_node": "node_312",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.658)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_312",
      "to_node": "node_313",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_313",
      "to_node": "node_314",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_314",
      "to_node": "node_315",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_316",
      "to_node": "node_317",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.340)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_317",
      "to_node": "node_318",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.595)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_318",
      "to_node": "node_319",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.529)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_319",
      "to_node": "node_320",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_321",
      "to_node": "node_322",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_322",
      "to_node": "node_323",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_323",
      "to_node": "node_324",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.143)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_324",
      "to_node": "node_325",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.236)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_325",
      "to_node": "node_326",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_326",
      "to_node": "node_327",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_328",
      "to_node": "node_329",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_329",
      "to_node": "node_330",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_330",
      "to_node": "node_331",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_331",
      "to_node": "node_332",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_333",
      "to_node": "node_334",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.111)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_334",
      "to_node": "node_335",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_335",
      "to_node": "node_336",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_336",
      "to_node": "node_337",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_337",
      "to_node": "node_338",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_339",
      "to_node": "node_340",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001790)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_340",
      "to_node": "node_341",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_341",
      "to_node": "node_342",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.295)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_342",
      "to_node": "node_343",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_343",
      "to_node": "node_344",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_345",
      "to_node": "node_346",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_346",
      "to_node": "node_347",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.333)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_347",
      "to_node": "node_348",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.179)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_348",
      "to_node": "node_349",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.582)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_349",
      "to_node": "node_350",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_350",
      "to_node": "node_351",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.160)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_351",
      "to_node": "node_352",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_353",
      "to_node": "node_354",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.319)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_354",
      "to_node": "node_355",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.546)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_355",
      "to_node": "node_356",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004757)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_356",
      "to_node": "node_357",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.637)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_357",
      "to_node": "node_358",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.318)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_358",
      "to_node": "node_359",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_359",
      "to_node": "node_360",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_361",
      "to_node": "node_362",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_362",
      "to_node": "node_363",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.230)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_363",
      "to_node": "node_364",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_364",
      "to_node": "node_365",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_366",
      "to_node": "node_367",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 60%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.603)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_367",
      "to_node": "node_368",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_368",
      "to_node": "node_369",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.202)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_369",
      "to_node": "node_370",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.325)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_370",
      "to_node": "node_371",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_372",
      "to_node": "node_373",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003531)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_373",
      "to_node": "node_374",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_374",
      "to_node": "node_375",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004045)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_375",
      "to_node": "node_376",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002169)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_376",
      "to_node": "node_377",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_377",
      "to_node": "node_378",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_378",
      "to_node": "node_379",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_380",
      "to_node": "node_381",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004784)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_381",
      "to_node": "node_382",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.125)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_382",
      "to_node": "node_383",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.182)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_383",
      "to_node": "node_384",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_384",
      "to_node": "node_385",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.179)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_385",
      "to_node": "node_386",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_387",
      "to_node": "node_388",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.391)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_388",
      "to_node": "node_389",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.359)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_389",
      "to_node": "node_390",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.302)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_390",
      "to_node": "node_391",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.486)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_391",
      "to_node": "node_392",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_392",
      "to_node": "node_393",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.372)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_393",
      "to_node": "node_394",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_395",
      "to_node": "node_396",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.634)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_396",
      "to_node": "node_397",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.115)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_397",
      "to_node": "node_398",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_398",
      "to_node": "node_399",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_399",
      "to_node": "node_400",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004017)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_400",
      "to_node": "node_401",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_401",
      "to_node": "node_402",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_403",
      "to_node": "node_404",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.397)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_404",
      "to_node": "node_405",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003756)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_405",
      "to_node": "node_406",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.250)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_406",
      "to_node": "node_407",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_407",
      "to_node": "node_408",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.468)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_408",
      "to_node": "node_409",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002937)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_409",
      "to_node": "node_410",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.126)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_410",
      "to_node": "node_411",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_412",
      "to_node": "node_413",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_413",
      "to_node": "node_414",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 51%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.513)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_414",
      "to_node": "node_415",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_415",
      "to_node": "node_416",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_416",
      "to_node": "node_417",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_418",
      "to_node": "node_419",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_419",
      "to_node": "node_420",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_420",
      "to_node": "node_421",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_421",
      "to_node": "node_422",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_422",
      "to_node": "node_423",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_424",
      "to_node": "node_425",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_425",
      "to_node": "node_426",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_426",
      "to_node": "node_427",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_427",
      "to_node": "node_428",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_429",
      "to_node": "node_430",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_430",
      "to_node": "node_431",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_431",
      "to_node": "node_432",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004129)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_432",
      "to_node": "node_433",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003730)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_433",
      "to_node": "node_434",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.555)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_434",
      "to_node": "node_435",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_435",
      "to_node": "node_436",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_437",
      "to_node": "node_438",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.546)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_438",
      "to_node": "node_439",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.285)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_439",
      "to_node": "node_440",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_440",
      "to_node": "node_441",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.353)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_441",
      "to_node": "node_442",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.580)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_442",
      "to_node": "node_443",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002532)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_443",
      "to_node": "node_444",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.305)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_444",
      "to_node": "node_445",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_446",
      "to_node": "node_447",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_447",
      "to_node": "node_448",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_448",
      "to_node": "node_449",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_449",
      "to_node": "node_450",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_450",
      "to_node": "node_451",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_451",
      "to_node": "node_452",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.217)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_452",
      "to_node": "node_453",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_453",
      "to_node": "node_454",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_455",
      "to_node": "node_456",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003653)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_456",
      "to_node": "node_457",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_457",
      "to_node": "node_458",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_458",
      "to_node": "node_459",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_459",
      "to_node": "node_460",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_460",
      "to_node": "node_461",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_461",
      "to_node": "node_462",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.529)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_462",
      "to_node": "node_463",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_464",
      "to_node": "node_465",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_465",
      "to_node": "node_466",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.208)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_466",
      "to_node": "node_467",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_467",
      "to_node": "node_468",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.522)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_468",
      "to_node": "node_469",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.605)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_469",
      "to_node": "node_470",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_470",
      "to_node": "node_471",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_472",
      "to_node": "node_473",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_473",
      "to_node": "node_474",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.339)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_474",
      "to_node": "node_475",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003535)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_475",
      "to_node": "node_476",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.376)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_476",
      "to_node": "node_477",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_478",
      "to_node": "node_479",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_479",
      "to_node": "node_480",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_480",
      "to_node": "node_481",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_481",
      "to_node": "node_482",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.543)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_482",
      "to_node": "node_483",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_483",
      "to_node": "node_484",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_485",
      "to_node": "node_486",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.395)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_486",
      "to_node": "node_487",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.431)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_487",
      "to_node": "node_488",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.116)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_488",
      "to_node": "node_489",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_490",
      "to_node": "node_491",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.155)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_491",
      "to_node": "node_492",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.248)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_492",
      "to_node": "node_493",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.124)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_493",
      "to_node": "node_494",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_494",
      "to_node": "node_495",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.404)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_495",
      "to_node": "node_496",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_496",
      "to_node": "node_497",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_498",
      "to_node": "node_499",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002848)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_499",
      "to_node": "node_500",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_500",
      "to_node": "node_501",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.161)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_501",
      "to_node": "node_502",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 60%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.603)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_502",
      "to_node": "node_503",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_503",
      "to_node": "node_504",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_505",
      "to_node": "node_506",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.131)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_506",
      "to_node": "node_507",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.002330)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_507",
      "to_node": "node_508",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.172)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_508",
      "to_node": "node_509",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.550)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_509",
      "to_node": "node_510",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_510",
      "to_node": "node_511",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_511",
      "to_node": "node_512",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_512",
      "to_node": "node_513",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_514",
      "to_node": "node_515",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.335)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_515",
      "to_node": "node_516",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004259)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_516",
      "to_node": "node_517",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.264)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_517",
      "to_node": "node_518",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.488)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_518",
      "to_node": "node_519",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_520",
      "to_node": "node_521",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_521",
      "to_node": "node_522",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004953)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_522",
      "to_node": "node_523",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.264)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_523",
      "to_node": "node_524",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.318)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_524",
      "to_node": "node_525",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_525",
      "to_node": "node_526",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_527",
      "to_node": "node_528",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_528",
      "to_node": "node_529",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_529",
      "to_node": "node_530",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.117)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_530",
      "to_node": "node_531",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.168)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_531",
      "to_node": "node_532",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_533",
      "to_node": "node_534",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.148)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_534",
      "to_node": "node_535",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.399)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_535",
      "to_node": "node_536",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_536",
      "to_node": "node_537",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.259)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_537",
      "to_node": "node_538",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_538",
      "to_node": "node_539",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.241)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_539",
      "to_node": "node_540",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_540",
      "to_node": "node_541",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_542",
      "to_node": "node_543",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_543",
      "to_node": "node_544",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004821)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_544",
      "to_node": "node_545",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.546)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_545",
      "to_node": "node_546",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002961)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_546",
      "to_node": "node_547",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005523)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_547",
      "to_node": "node_548",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.116)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_548",
      "to_node": "node_549",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_550",
      "to_node": "node_551",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.161)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_551",
      "to_node": "node_552",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005475)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_552",
      "to_node": "node_553",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.453)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_553",
      "to_node": "node_554",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_554",
      "to_node": "node_555",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_555",
      "to_node": "node_556",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_557",
      "to_node": "node_558",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005109)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_558",
      "to_node": "node_559",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.208)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_559",
      "to_node": "node_560",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.335)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_560",
      "to_node": "node_561",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_562",
      "to_node": "node_563",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002473)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_563",
      "to_node": "node_564",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_564",
      "to_node": "node_565",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.499)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_565",
      "to_node": "node_566",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004647)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_566",
      "to_node": "node_567",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_567",
      "to_node": "node_568",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.124)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_568",
      "to_node": "node_569",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_570",
      "to_node": "node_571",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.664)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_571",
      "to_node": "node_572",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_572",
      "to_node": "node_573",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_573",
      "to_node": "node_574",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_574",
      "to_node": "node_575",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_575",
      "to_node": "node_576",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_577",
      "to_node": "node_578",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.389)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_578",
      "to_node": "node_579",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_579",
      "to_node": "node_580",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.562)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_580",
      "to_node": "node_581",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_581",
      "to_node": "node_582",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_583",
      "to_node": "node_584",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_584",
      "to_node": "node_585",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_585",
      "to_node": "node_586",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_586",
      "to_node": "node_587",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_587",
      "to_node": "node_588",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_589",
      "to_node": "node_590",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.302)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_590",
      "to_node": "node_591",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.196)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_591",
      "to_node": "node_592",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.305)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_592",
      "to_node": "node_593",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_594",
      "to_node": "node_595",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.385)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_595",
      "to_node": "node_596",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.259)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_596",
      "to_node": "node_597",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_597",
      "to_node": "node_598",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.395)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_598",
      "to_node": "node_599",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.359)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_599",
      "to_node": "node_600",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_601",
      "to_node": "node_602",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003011)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_602",
      "to_node": "node_603",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_603",
      "to_node": "node_604",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.244)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_604",
      "to_node": "node_605",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.126)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_605",
      "to_node": "node_606",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.319)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_606",
      "to_node": "node_607",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_607",
      "to_node": "node_608",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.250)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_608",
      "to_node": "node_609",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_610",
      "to_node": "node_611",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_611",
      "to_node": "node_612",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.199)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_612",
      "to_node": "node_613",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.377)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_613",
      "to_node": "node_614",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_615",
      "to_node": "node_616",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.642)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_616",
      "to_node": "node_617",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_617",
      "to_node": "node_618",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.422)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_618",
      "to_node": "node_619",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_620",
      "to_node": "node_621",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005070)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_621",
      "to_node": "node_622",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.385)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_622",
      "to_node": "node_623",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.196)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_623",
      "to_node": "node_624",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.217)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_624",
      "to_node": "node_625",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_625",
      "to_node": "node_626",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.389)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_626",
      "to_node": "node_627",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_628",
      "to_node": "node_629",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 65%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.647)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_629",
      "to_node": "node_630",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_630",
      "to_node": "node_631",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_631",
      "to_node": "node_632",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.527)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_632",
      "to_node": "node_633",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_633",
      "to_node": "node_634",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_634",
      "to_node": "node_635",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_635",
      "to_node": "node_636",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_637",
      "to_node": "node_638",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005471)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_638",
      "to_node": "node_639",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.145)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_639",
      "to_node": "node_640",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.205)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_640",
      "to_node": "node_641",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.404)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_641",
      "to_node": "node_642",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_643",
      "to_node": "node_644",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003732)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_644",
      "to_node": "node_645",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_645",
      "to_node": "node_646",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_646",
      "to_node": "node_647",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_648",
      "to_node": "node_649",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003502)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_649",
      "to_node": "node_650",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_650",
      "to_node": "node_651",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_651",
      "to_node": "node_652",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_653",
      "to_node": "node_654",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_654",
      "to_node": "node_655",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_655",
      "to_node": "node_656",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_657",
      "to_node": "node_658",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.359)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_658",
      "to_node": "node_659",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.477)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_659",
      "to_node": "node_660",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.316)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_660",
      "to_node": "node_661",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_662",
      "to_node": "node_663",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002909)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_663",
      "to_node": "node_664",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.460)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_664",
      "to_node": "node_665",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_665",
      "to_node": "node_666",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.558)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_666",
      "to_node": "node_667",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005426)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_667",
      "to_node": "node_668",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.136)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_668",
      "to_node": "node_669",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_670",
      "to_node": "node_671",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_671",
      "to_node": "node_672",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.302)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_672",
      "to_node": "node_673",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_673",
      "to_node": "node_674",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_675",
      "to_node": "node_676",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_676",
      "to_node": "node_677",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_677",
      "to_node": "node_678",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.529)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_678",
      "to_node": "node_679",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003370)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_679",
      "to_node": "node_680",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_680",
      "to_node": "node_681",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_681",
      "to_node": "node_682",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_682",
      "to_node": "node_683",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_684",
      "to_node": "node_685",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_685",
      "to_node": "node_686",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.241)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_686",
      "to_node": "node_687",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.111)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_687",
      "to_node": "node_688",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_689",
      "to_node": "node_690",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004077)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_690",
      "to_node": "node_691",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_691",
      "to_node": "node_692",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_692",
      "to_node": "node_693",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_693",
      "to_node": "node_694",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_694",
      "to_node": "node_695",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_696",
      "to_node": "node_697",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003052)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_697",
      "to_node": "node_698",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_698",
      "to_node": "node_699",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_699",
      "to_node": "node_700",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_701",
      "to_node": "node_702",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.379)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_702",
      "to_node": "node_703",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.522)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_703",
      "to_node": "node_704",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_704",
      "to_node": "node_705",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_705",
      "to_node": "node_706",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_706",
      "to_node": "node_707",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_708",
      "to_node": "node_709",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_709",
      "to_node": "node_710",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.206)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_710",
      "to_node": "node_711",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_711",
      "to_node": "node_712",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_712",
      "to_node": "node_713",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.543)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_713",
      "to_node": "node_714",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_714",
      "to_node": "node_715",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_715",
      "to_node": "node_716",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_717",
      "to_node": "node_718",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003844)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_718",
      "to_node": "node_719",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.152)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_719",
      "to_node": "node_720",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_720",
      "to_node": "node_721",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_721",
      "to_node": "node_722",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_722",
      "to_node": "node_723",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_723",
      "to_node": "node_724",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_724",
      "to_node": "node_725",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_726",
      "to_node": "node_727",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.131)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_727",
      "to_node": "node_728",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_728",
      "to_node": "node_729",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_729",
      "to_node": "node_730",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_731",
      "to_node": "node_732",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_732",
      "to_node": "node_733",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.433)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_733",
      "to_node": "node_734",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.145)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_734",
      "to_node": "node_735",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_736",
      "to_node": "node_737",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_737",
      "to_node": "node_738",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.536)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_738",
      "to_node": "node_739",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.393)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_739",
      "to_node": "node_740",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.412)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_740",
      "to_node": "node_741",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.202)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_741",
      "to_node": "node_742",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_743",
      "to_node": "node_744",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_744",
      "to_node": "node_745",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_745",
      "to_node": "node_746",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002817)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_746",
      "to_node": "node_747",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.527)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_747",
      "to_node": "node_748",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.437)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_748",
      "to_node": "node_749",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_749",
      "to_node": "node_750",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.188)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_750",
      "to_node": "node_751",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_752",
      "to_node": "node_753",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003797)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_753",
      "to_node": "node_754",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002927)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_754",
      "to_node": "node_755",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.319)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_755",
      "to_node": "node_756",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.524)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_756",
      "to_node": "node_757",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.351)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_757",
      "to_node": "node_758",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_759",
      "to_node": "node_760",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003347)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_760",
      "to_node": "node_761",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003594)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_761",
      "to_node": "node_762",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.200)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_762",
      "to_node": "node_763",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.565)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_763",
      "to_node": "node_764",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.555)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_764",
      "to_node": "node_765",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_765",
      "to_node": "node_766",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_767",
      "to_node": "node_768",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004726)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_768",
      "to_node": "node_769",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004270)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_769",
      "to_node": "node_770",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.139)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_770",
      "to_node": "node_771",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_771",
      "to_node": "node_772",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_772",
      "to_node": "node_773",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.490)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_773",
      "to_node": "node_774",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_775",
      "to_node": "node_776",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004088)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_776",
      "to_node": "node_777",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.637)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_777",
      "to_node": "node_778",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_778",
      "to_node": "node_779",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 60%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.597)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_779",
      "to_node": "node_780",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004524)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_780",
      "to_node": "node_781",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_781",
      "to_node": "node_782",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_783",
      "to_node": "node_784",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.379)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_784",
      "to_node": "node_785",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_785",
      "to_node": "node_786",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.346)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_786",
      "to_node": "node_787",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_787",
      "to_node": "node_788",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.287)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_788",
      "to_node": "node_789",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_790",
      "to_node": "node_791",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.176)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_791",
      "to_node": "node_792",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.285)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_792",
      "to_node": "node_793",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 65%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.650)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_793",
      "to_node": "node_794",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_794",
      "to_node": "node_795",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.447)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_795",
      "to_node": "node_796",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_796",
      "to_node": "node_797",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.406)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_797",
      "to_node": "node_798",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_799",
      "to_node": "node_800",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.361)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_800",
      "to_node": "node_801",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.130)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_801",
      "to_node": "node_802",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.309)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_802",
      "to_node": "node_803",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.572)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_803",
      "to_node": "node_804",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.182)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_804",
      "to_node": "node_805",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_806",
      "to_node": "node_807",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_807",
      "to_node": "node_808",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.326)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_808",
      "to_node": "node_809",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_809",
      "to_node": "node_810",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_811",
      "to_node": "node_812",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.119)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_812",
      "to_node": "node_813",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002677)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_813",
      "to_node": "node_814",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.163)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_814",
      "to_node": "node_815",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003210)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_815",
      "to_node": "node_816",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_816",
      "to_node": "node_817",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_817",
      "to_node": "node_818",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_819",
      "to_node": "node_820",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003655)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_820",
      "to_node": "node_821",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_821",
      "to_node": "node_822",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 62%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.616)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_822",
      "to_node": "node_823",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_823",
      "to_node": "node_824",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_824",
      "to_node": "node_825",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_825",
      "to_node": "node_826",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_827",
      "to_node": "node_828",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.366)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_828",
      "to_node": "node_829",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_829",
      "to_node": "node_830",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_830",
      "to_node": "node_831",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_831",
      "to_node": "node_832",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_832",
      "to_node": "node_833",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_834",
      "to_node": "node_835",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.133)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_835",
      "to_node": "node_836",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.289)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_836",
      "to_node": "node_837",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_837",
      "to_node": "node_838",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_839",
      "to_node": "node_840",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_840",
      "to_node": "node_841",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.285)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_841",
      "to_node": "node_842",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_842",
      "to_node": "node_843",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_843",
      "to_node": "node_844",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_844",
      "to_node": "node_845",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_846",
      "to_node": "node_847",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.445)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_847",
      "to_node": "node_848",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.188)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_848",
      "to_node": "node_849",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_849",
      "to_node": "node_850",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_850",
      "to_node": "node_851",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_852",
      "to_node": "node_853",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.130)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_853",
      "to_node": "node_854",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004240)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_854",
      "to_node": "node_855",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_855",
      "to_node": "node_856",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002891)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_856",
      "to_node": "node_857",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_857",
      "to_node": "node_858",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_859",
      "to_node": "node_860",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.120)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_860",
      "to_node": "node_861",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_861",
      "to_node": "node_862",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004269)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_862",
      "to_node": "node_863",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.152)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_863",
      "to_node": "node_864",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.645)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_864",
      "to_node": "node_865",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_865",
      "to_node": "node_866",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.255)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_866",
      "to_node": "node_867",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_868",
      "to_node": "node_869",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.570)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_869",
      "to_node": "node_870",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.464)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_870",
      "to_node": "node_871",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.117)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_871",
      "to_node": "node_872",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.475)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_872",
      "to_node": "node_873",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_873",
      "to_node": "node_874",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_874",
      "to_node": "node_875",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_875",
      "to_node": "node_876",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_877",
      "to_node": "node_878",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_878",
      "to_node": "node_879",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.490)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_879",
      "to_node": "node_880",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_880",
      "to_node": "node_881",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_882",
      "to_node": "node_883",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.112)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_883",
      "to_node": "node_884",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.133)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_884",
      "to_node": "node_885",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_885",
      "to_node": "node_886",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_886",
      "to_node": "node_887",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_887",
      "to_node": "node_888",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.142)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_888",
      "to_node": "node_889",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.131)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_889",
      "to_node": "node_890",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_891",
      "to_node": "node_892",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_892",
      "to_node": "node_893",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.238)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_893",
      "to_node": "node_894",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_894",
      "to_node": "node_895",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.639)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_895",
      "to_node": "node_896",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_897",
      "to_node": "node_898",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.259)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_898",
      "to_node": "node_899",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.159)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_899",
      "to_node": "node_900",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005436)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_900",
      "to_node": "node_901",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002869)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_901",
      "to_node": "node_902",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004671)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_902",
      "to_node": "node_903",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_903",
      "to_node": "node_904",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.152)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_904",
      "to_node": "node_905",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_906",
      "to_node": "node_907",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.182)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_907",
      "to_node": "node_908",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004873)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_908",
      "to_node": "node_909",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_909",
      "to_node": "node_910",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_911",
      "to_node": "node_912",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_912",
      "to_node": "node_913",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_913",
      "to_node": "node_914",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_914",
      "to_node": "node_915",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_916",
      "to_node": "node_917",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_917",
      "to_node": "node_918",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_918",
      "to_node": "node_919",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_919",
      "to_node": "node_920",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_921",
      "to_node": "node_922",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004750)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_922",
      "to_node": "node_923",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_923",
      "to_node": "node_924",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.570)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_924",
      "to_node": "node_925",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.142)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_925",
      "to_node": "node_926",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_926",
      "to_node": "node_927",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_928",
      "to_node": "node_929",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.172)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_929",
      "to_node": "node_930",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_930",
      "to_node": "node_931",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_931",
      "to_node": "node_932",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003826)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_932",
      "to_node": "node_933",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_933",
      "to_node": "node_934",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.244)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_934",
      "to_node": "node_935",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.316)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_935",
      "to_node": "node_936",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_937",
      "to_node": "node_938",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.575)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_938",
      "to_node": "node_939",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.248)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_939",
      "to_node": "node_940",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.548)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_940",
      "to_node": "node_941",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_941",
      "to_node": "node_942",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005371)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_942",
      "to_node": "node_943",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.580)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_943",
      "to_node": "node_944",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.148)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_944",
      "to_node": "node_945",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_946",
      "to_node": "node_947",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003986)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_947",
      "to_node": "node_948",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_948",
      "to_node": "node_949",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_949",
      "to_node": "node_950",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_951",
      "to_node": "node_952",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_952",
      "to_node": "node_953",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.348)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_953",
      "to_node": "node_954",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.151)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_954",
      "to_node": "node_955",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.290)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_955",
      "to_node": "node_956",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_956",
      "to_node": "node_957",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.161)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_957",
      "to_node": "node_958",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_959",
      "to_node": "node_960",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.488)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_960",
      "to_node": "node_961",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.355)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_961",
      "to_node": "node_962",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003342)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_962",
      "to_node": "node_963",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.289)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_963",
      "to_node": "node_964",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.130)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_964",
      "to_node": "node_965",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_966",
      "to_node": "node_967",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.122)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_967",
      "to_node": "node_968",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.285)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_968",
      "to_node": "node_969",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_969",
      "to_node": "node_970",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_971",
      "to_node": "node_972",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.002886)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_972",
      "to_node": "node_973",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002688)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_973",
      "to_node": "node_974",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_974",
      "to_node": "node_975",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_975",
      "to_node": "node_976",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.541)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_976",
      "to_node": "node_977",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_977",
      "to_node": "node_978",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_978",
      "to_node": "node_979",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_980",
      "to_node": "node_981",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_981",
      "to_node": "node_982",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.125)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_982",
      "to_node": "node_983",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_983",
      "to_node": "node_984",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_984",
      "to_node": "node_985",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_986",
      "to_node": "node_987",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.002489)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_987",
      "to_node": "node_988",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_988",
      "to_node": "node_989",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.637)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_989",
      "to_node": "node_990",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_990",
      "to_node": "node_991",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003680)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_991",
      "to_node": "node_992",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_992",
      "to_node": "node_993",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_994",
      "to_node": "node_995",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002874)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_995",
      "to_node": "node_996",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.157)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_996",
      "to_node": "node_997",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.114)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_997",
      "to_node": "node_998",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004101)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_998",
      "to_node": "node_999",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.312)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_999",
      "to_node": "node_1000",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1001",
      "to_node": "node_1002",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002938)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1002",
      "to_node": "node_1003",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.125)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1003",
      "to_node": "node_1004",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.348)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1004",
      "to_node": "node_1005",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.639)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1005",
      "to_node": "node_1006",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1007",
      "to_node": "node_1008",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004819)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1008",
      "to_node": "node_1009",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004675)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1009",
      "to_node": "node_1010",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005521)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1010",
      "to_node": "node_1011",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1011",
      "to_node": "node_1012",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.529)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1012",
      "to_node": "node_1013",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.117)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1013",
      "to_node": "node_1014",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1015",
      "to_node": "node_1016",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.290)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1016",
      "to_node": "node_1017",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.188)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1017",
      "to_node": "node_1018",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.335)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1018",
      "to_node": "node_1019",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1019",
      "to_node": "node_1020",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1021",
      "to_node": "node_1022",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1022",
      "to_node": "node_1023",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.196)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1023",
      "to_node": "node_1024",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.325)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1024",
      "to_node": "node_1025",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1026",
      "to_node": "node_1027",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1027",
      "to_node": "node_1028",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1028",
      "to_node": "node_1029",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.131)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1029",
      "to_node": "node_1030",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004141)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1030",
      "to_node": "node_1031",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1031",
      "to_node": "node_1032",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1032",
      "to_node": "node_1033",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.202)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1033",
      "to_node": "node_1034",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1035",
      "to_node": "node_1036",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.127)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1036",
      "to_node": "node_1037",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.613)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1037",
      "to_node": "node_1038",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1038",
      "to_node": "node_1039",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1039",
      "to_node": "node_1040",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1040",
      "to_node": "node_1041",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.416)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1041",
      "to_node": "node_1042",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1043",
      "to_node": "node_1044",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1044",
      "to_node": "node_1045",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1045",
      "to_node": "node_1046",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.393)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1046",
      "to_node": "node_1047",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1047",
      "to_node": "node_1048",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1049",
      "to_node": "node_1050",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.410)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1050",
      "to_node": "node_1051",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1051",
      "to_node": "node_1052",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.468)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1052",
      "to_node": "node_1053",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1054",
      "to_node": "node_1055",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.486)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1055",
      "to_node": "node_1056",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.319)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1056",
      "to_node": "node_1057",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1057",
      "to_node": "node_1058",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1059",
      "to_node": "node_1060",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002372)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1060",
      "to_node": "node_1061",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.287)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1061",
      "to_node": "node_1062",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1062",
      "to_node": "node_1063",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1063",
      "to_node": "node_1064",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1064",
      "to_node": "node_1065",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005309)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1065",
      "to_node": "node_1066",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.181)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1066",
      "to_node": "node_1067",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1068",
      "to_node": "node_1069",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.389)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1069",
      "to_node": "node_1070",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.416)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1070",
      "to_node": "node_1071",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.250)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1071",
      "to_node": "node_1072",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.285)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1072",
      "to_node": "node_1073",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1074",
      "to_node": "node_1075",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004088)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1075",
      "to_node": "node_1076",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1076",
      "to_node": "node_1077",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 62%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.618)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1077",
      "to_node": "node_1078",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004391)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1078",
      "to_node": "node_1079",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003967)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1079",
      "to_node": "node_1080",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.200)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1080",
      "to_node": "node_1081",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1081",
      "to_node": "node_1082",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1083",
      "to_node": "node_1084",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1084",
      "to_node": "node_1085",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.389)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1085",
      "to_node": "node_1086",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1086",
      "to_node": "node_1087",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.285)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1087",
      "to_node": "node_1088",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.127)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1088",
      "to_node": "node_1089",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1089",
      "to_node": "node_1090",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1091",
      "to_node": "node_1092",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.001555)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1092",
      "to_node": "node_1093",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.230)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1093",
      "to_node": "node_1094",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1094",
      "to_node": "node_1095",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.126)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1095",
      "to_node": "node_1096",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1096",
      "to_node": "node_1097",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.486)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1097",
      "to_node": "node_1098",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1099",
      "to_node": "node_1100",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004709)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1100",
      "to_node": "node_1101",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002485)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1101",
      "to_node": "node_1102",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003146)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1102",
      "to_node": "node_1103",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.473)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1103",
      "to_node": "node_1104",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.330)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1104",
      "to_node": "node_1105",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1106",
      "to_node": "node_1107",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.403)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1107",
      "to_node": "node_1108",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.527)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1108",
      "to_node": "node_1109",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004216)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1109",
      "to_node": "node_1110",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1110",
      "to_node": "node_1111",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1112",
      "to_node": "node_1113",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.230)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1113",
      "to_node": "node_1114",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1114",
      "to_node": "node_1115",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1115",
      "to_node": "node_1116",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1117",
      "to_node": "node_1118",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1118",
      "to_node": "node_1119",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002273)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1119",
      "to_node": "node_1120",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1120",
      "to_node": "node_1121",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004033)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1121",
      "to_node": "node_1122",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1122",
      "to_node": "node_1123",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1124",
      "to_node": "node_1125",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1125",
      "to_node": "node_1126",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1126",
      "to_node": "node_1127",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.429)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1127",
      "to_node": "node_1128",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.385)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1128",
      "to_node": "node_1129",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1129",
      "to_node": "node_1130",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1130",
      "to_node": "node_1131",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.475)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1131",
      "to_node": "node_1132",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1133",
      "to_node": "node_1134",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.577)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1134",
      "to_node": "node_1135",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003422)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1135",
      "to_node": "node_1136",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004105)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1136",
      "to_node": "node_1137",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1137",
      "to_node": "node_1138",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.181)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1138",
      "to_node": "node_1139",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1140",
      "to_node": "node_1141",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1141",
      "to_node": "node_1142",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.379)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1142",
      "to_node": "node_1143",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.287)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1143",
      "to_node": "node_1144",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.136)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1144",
      "to_node": "node_1145",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.112)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1145",
      "to_node": "node_1146",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1146",
      "to_node": "node_1147",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1148",
      "to_node": "node_1149",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1149",
      "to_node": "node_1150",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.333)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1150",
      "to_node": "node_1151",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.326)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1151",
      "to_node": "node_1152",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003727)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1152",
      "to_node": "node_1153",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.305)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1153",
      "to_node": "node_1154",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1154",
      "to_node": "node_1155",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1156",
      "to_node": "node_1157",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1157",
      "to_node": "node_1158",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.129)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1158",
      "to_node": "node_1159",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1159",
      "to_node": "node_1160",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1160",
      "to_node": "node_1161",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1161",
      "to_node": "node_1162",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.548)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1162",
      "to_node": "node_1163",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1164",
      "to_node": "node_1165",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1165",
      "to_node": "node_1166",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.002453)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1166",
      "to_node": "node_1167",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.316)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1167",
      "to_node": "node_1168",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1168",
      "to_node": "node_1169",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1169",
      "to_node": "node_1170",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1170",
      "to_node": "node_1171",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1172",
      "to_node": "node_1173",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1173",
      "to_node": "node_1174",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1174",
      "to_node": "node_1175",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.637)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1175",
      "to_node": "node_1176",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1177",
      "to_node": "node_1178",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004205)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1178",
      "to_node": "node_1179",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004966)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1179",
      "to_node": "node_1180",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.460)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1180",
      "to_node": "node_1181",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.447)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1181",
      "to_node": "node_1182",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004334)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1182",
      "to_node": "node_1183",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1183",
      "to_node": "node_1184",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.376)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1184",
      "to_node": "node_1185",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1186",
      "to_node": "node_1187",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.182)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1187",
      "to_node": "node_1188",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1188",
      "to_node": "node_1189",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1189",
      "to_node": "node_1190",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004393)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1190",
      "to_node": "node_1191",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005113)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1191",
      "to_node": "node_1192",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1192",
      "to_node": "node_1193",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1194",
      "to_node": "node_1195",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004777)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1195",
      "to_node": "node_1196",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.152)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1196",
      "to_node": "node_1197",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1197",
      "to_node": "node_1198",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1198",
      "to_node": "node_1199",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1200",
      "to_node": "node_1201",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004882)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1201",
      "to_node": "node_1202",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004070)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1202",
      "to_node": "node_1203",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1203",
      "to_node": "node_1204",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1204",
      "to_node": "node_1205",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1206",
      "to_node": "node_1207",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.529)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1207",
      "to_node": "node_1208",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.205)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1208",
      "to_node": "node_1209",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.122)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1209",
      "to_node": "node_1210",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1210",
      "to_node": "node_1211",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1212",
      "to_node": "node_1213",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.149)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1213",
      "to_node": "node_1214",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1214",
      "to_node": "node_1215",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1215",
      "to_node": "node_1216",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002608)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1216",
      "to_node": "node_1217",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.410)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1217",
      "to_node": "node_1218",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1218",
      "to_node": "node_1219",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1219",
      "to_node": "node_1220",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1221",
      "to_node": "node_1222",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1222",
      "to_node": "node_1223",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1223",
      "to_node": "node_1224",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1225",
      "to_node": "node_1226",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.248)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1226",
      "to_node": "node_1227",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.460)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1227",
      "to_node": "node_1228",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1228",
      "to_node": "node_1229",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1230",
      "to_node": "node_1231",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003413)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1231",
      "to_node": "node_1232",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.305)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1232",
      "to_node": "node_1233",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1233",
      "to_node": "node_1234",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1234",
      "to_node": "node_1235",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.140)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1235",
      "to_node": "node_1236",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1237",
      "to_node": "node_1238",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1238",
      "to_node": "node_1239",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004216)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1239",
      "to_node": "node_1240",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1240",
      "to_node": "node_1241",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1241",
      "to_node": "node_1242",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1242",
      "to_node": "node_1243",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1244",
      "to_node": "node_1245",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003478)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1245",
      "to_node": "node_1246",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1246",
      "to_node": "node_1247",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005310)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1247",
      "to_node": "node_1248",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.179)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1248",
      "to_node": "node_1249",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1250",
      "to_node": "node_1251",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.230)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1251",
      "to_node": "node_1252",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1252",
      "to_node": "node_1253",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1253",
      "to_node": "node_1254",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.558)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1254",
      "to_node": "node_1255",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.248)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1255",
      "to_node": "node_1256",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1257",
      "to_node": "node_1258",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.230)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1258",
      "to_node": "node_1259",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1259",
      "to_node": "node_1260",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.161)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1260",
      "to_node": "node_1261",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.250)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1261",
      "to_node": "node_1262",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1263",
      "to_node": "node_1264",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1264",
      "to_node": "node_1265",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1265",
      "to_node": "node_1266",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003853)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1266",
      "to_node": "node_1267",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.176)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1267",
      "to_node": "node_1268",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.631)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1268",
      "to_node": "node_1269",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.355)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1269",
      "to_node": "node_1270",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1270",
      "to_node": "node_1271",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1272",
      "to_node": "node_1273",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.543)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1273",
      "to_node": "node_1274",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004469)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1274",
      "to_node": "node_1275",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.486)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1275",
      "to_node": "node_1276",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.168)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1276",
      "to_node": "node_1277",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1277",
      "to_node": "node_1278",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.548)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1278",
      "to_node": "node_1279",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1280",
      "to_node": "node_1281",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1281",
      "to_node": "node_1282",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.241)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1282",
      "to_node": "node_1283",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.195)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1283",
      "to_node": "node_1284",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1284",
      "to_node": "node_1285",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004976)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1285",
      "to_node": "node_1286",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1286",
      "to_node": "node_1287",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1288",
      "to_node": "node_1289",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004545)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1289",
      "to_node": "node_1290",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1290",
      "to_node": "node_1291",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1291",
      "to_node": "node_1292",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.185)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1292",
      "to_node": "node_1293",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1293",
      "to_node": "node_1294",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.504)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1294",
      "to_node": "node_1295",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1296",
      "to_node": "node_1297",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1297",
      "to_node": "node_1298",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1298",
      "to_node": "node_1299",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1299",
      "to_node": "node_1300",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1300",
      "to_node": "node_1301",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1302",
      "to_node": "node_1303",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004079)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1303",
      "to_node": "node_1304",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.538)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1304",
      "to_node": "node_1305",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004515)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1305",
      "to_node": "node_1306",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1306",
      "to_node": "node_1307",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1307",
      "to_node": "node_1308",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1309",
      "to_node": "node_1310",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1310",
      "to_node": "node_1311",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.175)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1311",
      "to_node": "node_1312",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1312",
      "to_node": "node_1313",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1313",
      "to_node": "node_1314",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1315",
      "to_node": "node_1316",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.462)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1316",
      "to_node": "node_1317",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.319)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1317",
      "to_node": "node_1318",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002962)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1318",
      "to_node": "node_1319",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.116)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1319",
      "to_node": "node_1320",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1321",
      "to_node": "node_1322",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1322",
      "to_node": "node_1323",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1323",
      "to_node": "node_1324",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1324",
      "to_node": "node_1325",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1325",
      "to_node": "node_1326",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1326",
      "to_node": "node_1327",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.656)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1327",
      "to_node": "node_1328",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1329",
      "to_node": "node_1330",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1330",
      "to_node": "node_1331",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1331",
      "to_node": "node_1332",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.460)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1332",
      "to_node": "node_1333",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.256)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1333",
      "to_node": "node_1334",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003844)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1334",
      "to_node": "node_1335",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1335",
      "to_node": "node_1336",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1337",
      "to_node": "node_1338",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1338",
      "to_node": "node_1339",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004661)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1339",
      "to_node": "node_1340",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1340",
      "to_node": "node_1341",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1342",
      "to_node": "node_1343",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002001)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1343",
      "to_node": "node_1344",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002943)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1344",
      "to_node": "node_1345",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1345",
      "to_node": "node_1346",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.250)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1346",
      "to_node": "node_1347",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1347",
      "to_node": "node_1348",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1349",
      "to_node": "node_1350",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002753)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1350",
      "to_node": "node_1351",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.125)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1351",
      "to_node": "node_1352",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.127)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1352",
      "to_node": "node_1353",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.139)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1353",
      "to_node": "node_1354",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1354",
      "to_node": "node_1355",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1356",
      "to_node": "node_1357",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001889)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1357",
      "to_node": "node_1358",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.397)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1358",
      "to_node": "node_1359",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.572)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1359",
      "to_node": "node_1360",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.414)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1360",
      "to_node": "node_1361",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.114)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1361",
      "to_node": "node_1362",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1362",
      "to_node": "node_1363",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.504)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1363",
      "to_node": "node_1364",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1365",
      "to_node": "node_1366",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1366",
      "to_node": "node_1367",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.269)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1367",
      "to_node": "node_1368",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.122)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1368",
      "to_node": "node_1369",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1369",
      "to_node": "node_1370",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1370",
      "to_node": "node_1371",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004534)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1371",
      "to_node": "node_1372",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.152)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1372",
      "to_node": "node_1373",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1374",
      "to_node": "node_1375",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002429)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1375",
      "to_node": "node_1376",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1376",
      "to_node": "node_1377",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1377",
      "to_node": "node_1378",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1378",
      "to_node": "node_1379",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.484)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1379",
      "to_node": "node_1380",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1380",
      "to_node": "node_1381",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1382",
      "to_node": "node_1383",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004196)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1383",
      "to_node": "node_1384",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.145)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1384",
      "to_node": "node_1385",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.466)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1385",
      "to_node": "node_1386",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004129)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1386",
      "to_node": "node_1387",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1387",
      "to_node": "node_1388",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1389",
      "to_node": "node_1390",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.613)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1390",
      "to_node": "node_1391",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.151)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1391",
      "to_node": "node_1392",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.168)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1392",
      "to_node": "node_1393",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004454)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1393",
      "to_node": "node_1394",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.130)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1394",
      "to_node": "node_1395",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1395",
      "to_node": "node_1396",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1396",
      "to_node": "node_1397",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1398",
      "to_node": "node_1399",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1399",
      "to_node": "node_1400",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1400",
      "to_node": "node_1401",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.148)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1401",
      "to_node": "node_1402",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.136)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1402",
      "to_node": "node_1403",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.289)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1403",
      "to_node": "node_1404",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1405",
      "to_node": "node_1406",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003371)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1406",
      "to_node": "node_1407",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1407",
      "to_node": "node_1408",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1408",
      "to_node": "node_1409",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1409",
      "to_node": "node_1410",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1410",
      "to_node": "node_1411",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1412",
      "to_node": "node_1413",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004110)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1413",
      "to_node": "node_1414",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.160)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1414",
      "to_node": "node_1415",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1415",
      "to_node": "node_1416",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.493)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1416",
      "to_node": "node_1417",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1417",
      "to_node": "node_1418",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1418",
      "to_node": "node_1419",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1419",
      "to_node": "node_1420",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1421",
      "to_node": "node_1422",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003478)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1422",
      "to_node": "node_1423",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.163)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1423",
      "to_node": "node_1424",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1424",
      "to_node": "node_1425",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.613)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1425",
      "to_node": "node_1426",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1426",
      "to_node": "node_1427",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1427",
      "to_node": "node_1428",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1428",
      "to_node": "node_1429",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1430",
      "to_node": "node_1431",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1431",
      "to_node": "node_1432",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1432",
      "to_node": "node_1433",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002547)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1433",
      "to_node": "node_1434",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.368)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1434",
      "to_node": "node_1435",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1435",
      "to_node": "node_1436",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004022)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1436",
      "to_node": "node_1437",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1437",
      "to_node": "node_1438",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1439",
      "to_node": "node_1440",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.565)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1440",
      "to_node": "node_1441",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.295)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1441",
      "to_node": "node_1442",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1442",
      "to_node": "node_1443",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1443",
      "to_node": "node_1444",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1445",
      "to_node": "node_1446",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.333)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1446",
      "to_node": "node_1447",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1447",
      "to_node": "node_1448",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1448",
      "to_node": "node_1449",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1450",
      "to_node": "node_1451",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.290)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1451",
      "to_node": "node_1452",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.143)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1452",
      "to_node": "node_1453",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1453",
      "to_node": "node_1454",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1454",
      "to_node": "node_1455",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.175)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1455",
      "to_node": "node_1456",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.319)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1456",
      "to_node": "node_1457",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1458",
      "to_node": "node_1459",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004041)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1459",
      "to_node": "node_1460",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1460",
      "to_node": "node_1461",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1461",
      "to_node": "node_1462",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1462",
      "to_node": "node_1463",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1464",
      "to_node": "node_1465",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1465",
      "to_node": "node_1466",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1466",
      "to_node": "node_1467",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.319)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1467",
      "to_node": "node_1468",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1468",
      "to_node": "node_1469",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.613)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1469",
      "to_node": "node_1470",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1471",
      "to_node": "node_1472",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.143)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1472",
      "to_node": "node_1473",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1473",
      "to_node": "node_1474",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.248)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1474",
      "to_node": "node_1475",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1476",
      "to_node": "node_1477",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003421)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1477",
      "to_node": "node_1478",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003674)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1478",
      "to_node": "node_1479",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.206)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1479",
      "to_node": "node_1480",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004006)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1480",
      "to_node": "node_1481",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.214)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1481",
      "to_node": "node_1482",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1483",
      "to_node": "node_1484",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.205)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1484",
      "to_node": "node_1485",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.285)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1485",
      "to_node": "node_1486",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.153)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1486",
      "to_node": "node_1487",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002775)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1487",
      "to_node": "node_1488",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1488",
      "to_node": "node_1489",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1489",
      "to_node": "node_1490",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1490",
      "to_node": "node_1491",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1492",
      "to_node": "node_1493",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.166)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1493",
      "to_node": "node_1494",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.214)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1494",
      "to_node": "node_1495",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.151)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1495",
      "to_node": "node_1496",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1496",
      "to_node": "node_1497",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1498",
      "to_node": "node_1499",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1499",
      "to_node": "node_1500",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.309)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1500",
      "to_node": "node_1501",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1501",
      "to_node": "node_1502",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1503",
      "to_node": "node_1504",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1504",
      "to_node": "node_1505",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002903)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1505",
      "to_node": "node_1506",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.139)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1506",
      "to_node": "node_1507",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 60%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.603)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1507",
      "to_node": "node_1508",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1508",
      "to_node": "node_1509",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1510",
      "to_node": "node_1511",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1511",
      "to_node": "node_1512",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1512",
      "to_node": "node_1513",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004604)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1513",
      "to_node": "node_1514",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.339)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1514",
      "to_node": "node_1515",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1515",
      "to_node": "node_1516",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.179)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1516",
      "to_node": "node_1517",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1518",
      "to_node": "node_1519",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005484)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1519",
      "to_node": "node_1520",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1520",
      "to_node": "node_1521",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.399)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1521",
      "to_node": "node_1522",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.143)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1522",
      "to_node": "node_1523",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1523",
      "to_node": "node_1524",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1524",
      "to_node": "node_1525",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1526",
      "to_node": "node_1527",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002501)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1527",
      "to_node": "node_1528",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1528",
      "to_node": "node_1529",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.302)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1529",
      "to_node": "node_1530",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1530",
      "to_node": "node_1531",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1532",
      "to_node": "node_1533",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.176)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1533",
      "to_node": "node_1534",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.241)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1534",
      "to_node": "node_1535",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.172)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1535",
      "to_node": "node_1536",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1536",
      "to_node": "node_1537",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1537",
      "to_node": "node_1538",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.479)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1538",
      "to_node": "node_1539",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1540",
      "to_node": "node_1541",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.185)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1541",
      "to_node": "node_1542",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1542",
      "to_node": "node_1543",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.302)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1543",
      "to_node": "node_1544",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.504)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1544",
      "to_node": "node_1545",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.176)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1545",
      "to_node": "node_1546",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.456)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1546",
      "to_node": "node_1547",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1547",
      "to_node": "node_1548",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1549",
      "to_node": "node_1550",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1550",
      "to_node": "node_1551",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002414)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1551",
      "to_node": "node_1552",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.401)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1552",
      "to_node": "node_1553",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.117)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1553",
      "to_node": "node_1554",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1554",
      "to_node": "node_1555",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.241)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1555",
      "to_node": "node_1556",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1557",
      "to_node": "node_1558",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004064)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1558",
      "to_node": "node_1559",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1559",
      "to_node": "node_1560",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.481)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1560",
      "to_node": "node_1561",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1561",
      "to_node": "node_1562",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.115)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1562",
      "to_node": "node_1563",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1564",
      "to_node": "node_1565",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1565",
      "to_node": "node_1566",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003972)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1566",
      "to_node": "node_1567",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.129)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1567",
      "to_node": "node_1568",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.117)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1568",
      "to_node": "node_1569",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1569",
      "to_node": "node_1570",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1571",
      "to_node": "node_1572",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.151)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1572",
      "to_node": "node_1573",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.255)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1573",
      "to_node": "node_1574",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1574",
      "to_node": "node_1575",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1576",
      "to_node": "node_1577",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 60%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.603)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1577",
      "to_node": "node_1578",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 65%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.647)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1578",
      "to_node": "node_1579",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004706)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1579",
      "to_node": "node_1580",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1580",
      "to_node": "node_1581",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1581",
      "to_node": "node_1582",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1583",
      "to_node": "node_1584",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.124)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1584",
      "to_node": "node_1585",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1585",
      "to_node": "node_1586",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1586",
      "to_node": "node_1587",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1587",
      "to_node": "node_1588",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1589",
      "to_node": "node_1590",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1590",
      "to_node": "node_1591",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1591",
      "to_node": "node_1592",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004926)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1592",
      "to_node": "node_1593",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1593",
      "to_node": "node_1594",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.328)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1594",
      "to_node": "node_1595",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1595",
      "to_node": "node_1596",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1597",
      "to_node": "node_1598",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1598",
      "to_node": "node_1599",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.385)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1599",
      "to_node": "node_1600",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1600",
      "to_node": "node_1601",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1602",
      "to_node": "node_1603",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1603",
      "to_node": "node_1604",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002293)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1604",
      "to_node": "node_1605",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.445)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1605",
      "to_node": "node_1606",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1606",
      "to_node": "node_1607",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004878)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1607",
      "to_node": "node_1608",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.340)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1608",
      "to_node": "node_1609",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1609",
      "to_node": "node_1610",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1611",
      "to_node": "node_1612",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1612",
      "to_node": "node_1613",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002526)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1613",
      "to_node": "node_1614",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1614",
      "to_node": "node_1615",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.149)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1615",
      "to_node": "node_1616",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.256)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1616",
      "to_node": "node_1617",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1618",
      "to_node": "node_1619",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1619",
      "to_node": "node_1620",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1620",
      "to_node": "node_1621",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.179)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1621",
      "to_node": "node_1622",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.196)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1622",
      "to_node": "node_1623",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1623",
      "to_node": "node_1624",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1625",
      "to_node": "node_1626",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004264)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1626",
      "to_node": "node_1627",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.443)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1627",
      "to_node": "node_1628",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004579)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1628",
      "to_node": "node_1629",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.175)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1629",
      "to_node": "node_1630",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1630",
      "to_node": "node_1631",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1632",
      "to_node": "node_1633",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.433)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1633",
      "to_node": "node_1634",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1634",
      "to_node": "node_1635",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1635",
      "to_node": "node_1636",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1636",
      "to_node": "node_1637",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.425)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1637",
      "to_node": "node_1638",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1639",
      "to_node": "node_1640",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.590)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1640",
      "to_node": "node_1641",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.160)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1641",
      "to_node": "node_1642",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1642",
      "to_node": "node_1643",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1643",
      "to_node": "node_1644",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.362)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1644",
      "to_node": "node_1645",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.553)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1645",
      "to_node": "node_1646",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.404)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1646",
      "to_node": "node_1647",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1648",
      "to_node": "node_1649",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002497)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1649",
      "to_node": "node_1650",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1650",
      "to_node": "node_1651",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.477)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1651",
      "to_node": "node_1652",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.305)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1652",
      "to_node": "node_1653",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.353)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1653",
      "to_node": "node_1654",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.582)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1654",
      "to_node": "node_1655",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1656",
      "to_node": "node_1657",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1657",
      "to_node": "node_1658",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.381)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1658",
      "to_node": "node_1659",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1659",
      "to_node": "node_1660",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1661",
      "to_node": "node_1662",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.466)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1662",
      "to_node": "node_1663",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1663",
      "to_node": "node_1664",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.502)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1664",
      "to_node": "node_1665",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1666",
      "to_node": "node_1667",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002727)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1667",
      "to_node": "node_1668",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1668",
      "to_node": "node_1669",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003543)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1669",
      "to_node": "node_1670",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1670",
      "to_node": "node_1671",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.175)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1671",
      "to_node": "node_1672",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1673",
      "to_node": "node_1674",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.449)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1674",
      "to_node": "node_1675",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.126)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1675",
      "to_node": "node_1676",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.451)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1676",
      "to_node": "node_1677",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1678",
      "to_node": "node_1679",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1679",
      "to_node": "node_1680",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1680",
      "to_node": "node_1681",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005113)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1681",
      "to_node": "node_1682",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004330)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1682",
      "to_node": "node_1683",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.206)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1683",
      "to_node": "node_1684",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1685",
      "to_node": "node_1686",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004732)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1686",
      "to_node": "node_1687",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003945)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1687",
      "to_node": "node_1688",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.325)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1688",
      "to_node": "node_1689",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1690",
      "to_node": "node_1691",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.001716)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1691",
      "to_node": "node_1692",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.001843)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1692",
      "to_node": "node_1693",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1693",
      "to_node": "node_1694",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.318)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1694",
      "to_node": "node_1695",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1695",
      "to_node": "node_1696",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.238)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1696",
      "to_node": "node_1697",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1698",
      "to_node": "node_1699",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.002664)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1699",
      "to_node": "node_1700",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004935)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1700",
      "to_node": "node_1701",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004858)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1701",
      "to_node": "node_1702",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.269)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1702",
      "to_node": "node_1703",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1703",
      "to_node": "node_1704",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.592)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1704",
      "to_node": "node_1705",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1706",
      "to_node": "node_1707",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1707",
      "to_node": "node_1708",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.484)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1708",
      "to_node": "node_1709",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1709",
      "to_node": "node_1710",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004569)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1710",
      "to_node": "node_1711",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002892)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1711",
      "to_node": "node_1712",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.143)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1712",
      "to_node": "node_1713",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1713",
      "to_node": "node_1714",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1715",
      "to_node": "node_1716",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.634)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1716",
      "to_node": "node_1717",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1717",
      "to_node": "node_1718",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003621)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1718",
      "to_node": "node_1719",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.316)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1719",
      "to_node": "node_1720",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1720",
      "to_node": "node_1721",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.316)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1721",
      "to_node": "node_1722",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1722",
      "to_node": "node_1723",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1724",
      "to_node": "node_1725",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1725",
      "to_node": "node_1726",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1726",
      "to_node": "node_1727",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1727",
      "to_node": "node_1728",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1729",
      "to_node": "node_1730",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.217)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1730",
      "to_node": "node_1731",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.135)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1731",
      "to_node": "node_1732",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002206)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1732",
      "to_node": "node_1733",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1733",
      "to_node": "node_1734",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1734",
      "to_node": "node_1735",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1736",
      "to_node": "node_1737",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004597)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1737",
      "to_node": "node_1738",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004412)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1738",
      "to_node": "node_1739",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004281)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1739",
      "to_node": "node_1740",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.136)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1740",
      "to_node": "node_1741",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1742",
      "to_node": "node_1743",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1743",
      "to_node": "node_1744",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1744",
      "to_node": "node_1745",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1745",
      "to_node": "node_1746",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1747",
      "to_node": "node_1748",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1748",
      "to_node": "node_1749",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1749",
      "to_node": "node_1750",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1751",
      "to_node": "node_1752",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002643)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1752",
      "to_node": "node_1753",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.250)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1753",
      "to_node": "node_1754",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1754",
      "to_node": "node_1755",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.344)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1755",
      "to_node": "node_1756",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1757",
      "to_node": "node_1758",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.112)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1758",
      "to_node": "node_1759",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1759",
      "to_node": "node_1760",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.181)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1760",
      "to_node": "node_1761",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1761",
      "to_node": "node_1762",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1762",
      "to_node": "node_1763",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1764",
      "to_node": "node_1765",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002925)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1765",
      "to_node": "node_1766",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.333)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1766",
      "to_node": "node_1767",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1767",
      "to_node": "node_1768",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.248)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1768",
      "to_node": "node_1769",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.585)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1769",
      "to_node": "node_1770",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1771",
      "to_node": "node_1772",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1772",
      "to_node": "node_1773",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.608)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1773",
      "to_node": "node_1774",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1774",
      "to_node": "node_1775",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1776",
      "to_node": "node_1777",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1777",
      "to_node": "node_1778",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1778",
      "to_node": "node_1779",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1779",
      "to_node": "node_1780",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1781",
      "to_node": "node_1782",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003620)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1782",
      "to_node": "node_1783",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.126)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1783",
      "to_node": "node_1784",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1784",
      "to_node": "node_1785",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1785",
      "to_node": "node_1786",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1787",
      "to_node": "node_1788",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1788",
      "to_node": "node_1789",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1789",
      "to_node": "node_1790",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.473)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1790",
      "to_node": "node_1791",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1792",
      "to_node": "node_1793",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002660)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1793",
      "to_node": "node_1794",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.416)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1794",
      "to_node": "node_1795",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.185)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1795",
      "to_node": "node_1796",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.122)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1796",
      "to_node": "node_1797",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.403)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1797",
      "to_node": "node_1798",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.339)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1798",
      "to_node": "node_1799",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1800",
      "to_node": "node_1801",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1801",
      "to_node": "node_1802",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1802",
      "to_node": "node_1803",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1803",
      "to_node": "node_1804",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.490)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1804",
      "to_node": "node_1805",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1806",
      "to_node": "node_1807",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002588)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1807",
      "to_node": "node_1808",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003431)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1808",
      "to_node": "node_1809",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.437)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1809",
      "to_node": "node_1810",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004826)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1810",
      "to_node": "node_1811",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1811",
      "to_node": "node_1812",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1812",
      "to_node": "node_1813",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1814",
      "to_node": "node_1815",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1815",
      "to_node": "node_1816",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.328)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1816",
      "to_node": "node_1817",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1817",
      "to_node": "node_1818",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1819",
      "to_node": "node_1820",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1820",
      "to_node": "node_1821",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004243)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1821",
      "to_node": "node_1822",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.181)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1822",
      "to_node": "node_1823",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1823",
      "to_node": "node_1824",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1825",
      "to_node": "node_1826",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1826",
      "to_node": "node_1827",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.385)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1827",
      "to_node": "node_1828",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.002850)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1828",
      "to_node": "node_1829",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.155)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1829",
      "to_node": "node_1830",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.114)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1830",
      "to_node": "node_1831",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1831",
      "to_node": "node_1832",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1832",
      "to_node": "node_1833",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1834",
      "to_node": "node_1835",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1835",
      "to_node": "node_1836",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1836",
      "to_node": "node_1837",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.385)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1837",
      "to_node": "node_1838",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1839",
      "to_node": "node_1840",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.153)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1840",
      "to_node": "node_1841",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004352)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1841",
      "to_node": "node_1842",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.236)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1842",
      "to_node": "node_1843",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.437)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1843",
      "to_node": "node_1844",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1844",
      "to_node": "node_1845",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1846",
      "to_node": "node_1847",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004479)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1847",
      "to_node": "node_1848",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.202)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1848",
      "to_node": "node_1849",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1849",
      "to_node": "node_1850",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1851",
      "to_node": "node_1852",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1852",
      "to_node": "node_1853",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1853",
      "to_node": "node_1854",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.418)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1854",
      "to_node": "node_1855",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1855",
      "to_node": "node_1856",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1856",
      "to_node": "node_1857",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1858",
      "to_node": "node_1859",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.202)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1859",
      "to_node": "node_1860",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.475)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1860",
      "to_node": "node_1861",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1861",
      "to_node": "node_1862",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.143)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1862",
      "to_node": "node_1863",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.577)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1863",
      "to_node": "node_1864",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.140)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1864",
      "to_node": "node_1865",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1866",
      "to_node": "node_1867",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1867",
      "to_node": "node_1868",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.195)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1868",
      "to_node": "node_1869",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.157)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1869",
      "to_node": "node_1870",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.582)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1870",
      "to_node": "node_1871",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.328)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1871",
      "to_node": "node_1872",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1873",
      "to_node": "node_1874",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1874",
      "to_node": "node_1875",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1875",
      "to_node": "node_1876",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.269)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1876",
      "to_node": "node_1877",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.468)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1877",
      "to_node": "node_1878",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1878",
      "to_node": "node_1879",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 51%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.513)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1879",
      "to_node": "node_1880",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.473)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1880",
      "to_node": "node_1881",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1882",
      "to_node": "node_1883",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.433)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1883",
      "to_node": "node_1884",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003953)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1884",
      "to_node": "node_1885",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.179)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1885",
      "to_node": "node_1886",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.582)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1886",
      "to_node": "node_1887",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004742)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1887",
      "to_node": "node_1888",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1888",
      "to_node": "node_1889",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.517)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1889",
      "to_node": "node_1890",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1891",
      "to_node": "node_1892",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003283)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1892",
      "to_node": "node_1893",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1893",
      "to_node": "node_1894",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.493)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1894",
      "to_node": "node_1895",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003855)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1895",
      "to_node": "node_1896",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1896",
      "to_node": "node_1897",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1897",
      "to_node": "node_1898",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1899",
      "to_node": "node_1900",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1900",
      "to_node": "node_1901",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1901",
      "to_node": "node_1902",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1902",
      "to_node": "node_1903",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1904",
      "to_node": "node_1905",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1905",
      "to_node": "node_1906",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1906",
      "to_node": "node_1907",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1907",
      "to_node": "node_1908",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.541)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1908",
      "to_node": "node_1909",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1910",
      "to_node": "node_1911",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.147)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1911",
      "to_node": "node_1912",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.172)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1912",
      "to_node": "node_1913",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1913",
      "to_node": "node_1914",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.264)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1914",
      "to_node": "node_1915",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1916",
      "to_node": "node_1917",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1917",
      "to_node": "node_1918",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.156)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1918",
      "to_node": "node_1919",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004081)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1919",
      "to_node": "node_1920",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.129)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1920",
      "to_node": "node_1921",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1921",
      "to_node": "node_1922",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1922",
      "to_node": "node_1923",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.481)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1923",
      "to_node": "node_1924",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1925",
      "to_node": "node_1926",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003450)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1926",
      "to_node": "node_1927",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.565)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1927",
      "to_node": "node_1928",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1928",
      "to_node": "node_1929",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1929",
      "to_node": "node_1930",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.477)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1930",
      "to_node": "node_1931",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1931",
      "to_node": "node_1932",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1932",
      "to_node": "node_1933",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1934",
      "to_node": "node_1935",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.449)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1935",
      "to_node": "node_1936",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.439)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1936",
      "to_node": "node_1937",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004972)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1937",
      "to_node": "node_1938",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.241)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1938",
      "to_node": "node_1939",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1940",
      "to_node": "node_1941",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1941",
      "to_node": "node_1942",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1942",
      "to_node": "node_1943",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.205)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1943",
      "to_node": "node_1944",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.117)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1944",
      "to_node": "node_1945",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1945",
      "to_node": "node_1946",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1947",
      "to_node": "node_1948",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004784)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1948",
      "to_node": "node_1949",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.595)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1949",
      "to_node": "node_1950",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1950",
      "to_node": "node_1951",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.125)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1951",
      "to_node": "node_1952",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1952",
      "to_node": "node_1953",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1954",
      "to_node": "node_1955",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1955",
      "to_node": "node_1956",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1956",
      "to_node": "node_1957",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1957",
      "to_node": "node_1958",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1958",
      "to_node": "node_1959",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.344)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1959",
      "to_node": "node_1960",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1960",
      "to_node": "node_1961",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1962",
      "to_node": "node_1963",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.289)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1963",
      "to_node": "node_1964",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003103)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1964",
      "to_node": "node_1965",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004806)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1965",
      "to_node": "node_1966",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1966",
      "to_node": "node_1967",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.312)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1967",
      "to_node": "node_1968",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1969",
      "to_node": "node_1970",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.471)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1970",
      "to_node": "node_1971",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1971",
      "to_node": "node_1972",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.255)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1972",
      "to_node": "node_1973",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1973",
      "to_node": "node_1974",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1975",
      "to_node": "node_1976",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.397)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1976",
      "to_node": "node_1977",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1977",
      "to_node": "node_1978",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.325)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1978",
      "to_node": "node_1979",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1979",
      "to_node": "node_1980",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005538)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1980",
      "to_node": "node_1981",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.114)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1981",
      "to_node": "node_1982",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1983",
      "to_node": "node_1984",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004798)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1984",
      "to_node": "node_1985",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1985",
      "to_node": "node_1986",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004335)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1986",
      "to_node": "node_1987",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005584)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1987",
      "to_node": "node_1988",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.351)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1988",
      "to_node": "node_1989",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.122)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1989",
      "to_node": "node_1990",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1991",
      "to_node": "node_1992",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002493)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1992",
      "to_node": "node_1993",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1993",
      "to_node": "node_1994",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.133)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1994",
      "to_node": "node_1995",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1995",
      "to_node": "node_1996",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.443)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1996",
      "to_node": "node_1997",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1998",
      "to_node": "node_1999",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_1999",
      "to_node": "node_2000",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.130)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2000",
      "to_node": "node_2001",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.441)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2001",
      "to_node": "node_2002",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.119)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2002",
      "to_node": "node_2003",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.562)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2003",
      "to_node": "node_2004",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.149)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2004",
      "to_node": "node_2005",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.634)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2005",
      "to_node": "node_2006",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2007",
      "to_node": "node_2008",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2008",
      "to_node": "node_2009",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2009",
      "to_node": "node_2010",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.305)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2010",
      "to_node": "node_2011",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2012",
      "to_node": "node_2013",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.376)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2013",
      "to_node": "node_2014",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2014",
      "to_node": "node_2015",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002860)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2015",
      "to_node": "node_2016",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004207)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2016",
      "to_node": "node_2017",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.156)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2017",
      "to_node": "node_2018",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 65%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.647)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2018",
      "to_node": "node_2019",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2019",
      "to_node": "node_2020",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2021",
      "to_node": "node_2022",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.370)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2022",
      "to_node": "node_2023",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.156)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2023",
      "to_node": "node_2024",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.379)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2024",
      "to_node": "node_2025",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2026",
      "to_node": "node_2027",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.473)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2027",
      "to_node": "node_2028",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2028",
      "to_node": "node_2029",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2029",
      "to_node": "node_2030",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2031",
      "to_node": "node_2032",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2032",
      "to_node": "node_2033",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.565)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2033",
      "to_node": "node_2034",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2034",
      "to_node": "node_2035",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2035",
      "to_node": "node_2036",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2036",
      "to_node": "node_2037",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2038",
      "to_node": "node_2039",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003369)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2039",
      "to_node": "node_2040",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2040",
      "to_node": "node_2041",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2041",
      "to_node": "node_2042",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004343)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2042",
      "to_node": "node_2043",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.202)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2043",
      "to_node": "node_2044",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.613)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2044",
      "to_node": "node_2045",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2046",
      "to_node": "node_2047",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.366)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2047",
      "to_node": "node_2048",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2048",
      "to_node": "node_2049",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.414)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2049",
      "to_node": "node_2050",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003028)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2050",
      "to_node": "node_2051",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2051",
      "to_node": "node_2052",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2052",
      "to_node": "node_2053",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.139)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2053",
      "to_node": "node_2054",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2055",
      "to_node": "node_2056",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.136)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2056",
      "to_node": "node_2057",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.238)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2057",
      "to_node": "node_2058",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004709)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2058",
      "to_node": "node_2059",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.330)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2059",
      "to_node": "node_2060",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.486)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2060",
      "to_node": "node_2061",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2061",
      "to_node": "node_2062",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2063",
      "to_node": "node_2064",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.531)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2064",
      "to_node": "node_2065",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2065",
      "to_node": "node_2066",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.318)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2066",
      "to_node": "node_2067",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2068",
      "to_node": "node_2069",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 51%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.513)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2069",
      "to_node": "node_2070",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2070",
      "to_node": "node_2071",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002187)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2071",
      "to_node": "node_2072",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003217)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2072",
      "to_node": "node_2073",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2073",
      "to_node": "node_2074",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.333)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2074",
      "to_node": "node_2075",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2076",
      "to_node": "node_2077",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.206)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2077",
      "to_node": "node_2078",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2078",
      "to_node": "node_2079",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.127)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2079",
      "to_node": "node_2080",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.546)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2080",
      "to_node": "node_2081",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.238)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2081",
      "to_node": "node_2082",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2082",
      "to_node": "node_2083",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2084",
      "to_node": "node_2085",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.431)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2085",
      "to_node": "node_2086",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2086",
      "to_node": "node_2087",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2087",
      "to_node": "node_2088",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2089",
      "to_node": "node_2090",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.553)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2090",
      "to_node": "node_2091",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004731)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2091",
      "to_node": "node_2092",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2092",
      "to_node": "node_2093",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2093",
      "to_node": "node_2094",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2094",
      "to_node": "node_2095",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2095",
      "to_node": "node_2096",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2097",
      "to_node": "node_2098",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003328)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2098",
      "to_node": "node_2099",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2099",
      "to_node": "node_2100",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2100",
      "to_node": "node_2101",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.151)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2101",
      "to_node": "node_2102",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2102",
      "to_node": "node_2103",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2104",
      "to_node": "node_2105",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.330)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2105",
      "to_node": "node_2106",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003334)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2106",
      "to_node": "node_2107",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2107",
      "to_node": "node_2108",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2108",
      "to_node": "node_2109",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.412)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2109",
      "to_node": "node_2110",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2111",
      "to_node": "node_2112",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.163)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2112",
      "to_node": "node_2113",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.236)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2113",
      "to_node": "node_2114",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.445)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2114",
      "to_node": "node_2115",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.481)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2115",
      "to_node": "node_2116",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2116",
      "to_node": "node_2117",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2118",
      "to_node": "node_2119",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.462)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2119",
      "to_node": "node_2120",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.236)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2120",
      "to_node": "node_2121",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005160)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2121",
      "to_node": "node_2122",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.582)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2122",
      "to_node": "node_2123",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004006)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2123",
      "to_node": "node_2124",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.214)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2124",
      "to_node": "node_2125",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2125",
      "to_node": "node_2126",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2127",
      "to_node": "node_2128",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003769)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2128",
      "to_node": "node_2129",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2129",
      "to_node": "node_2130",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.151)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2130",
      "to_node": "node_2131",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2131",
      "to_node": "node_2132",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2133",
      "to_node": "node_2134",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2134",
      "to_node": "node_2135",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004072)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2135",
      "to_node": "node_2136",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004243)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2136",
      "to_node": "node_2137",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.439)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2137",
      "to_node": "node_2138",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002686)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2138",
      "to_node": "node_2139",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2139",
      "to_node": "node_2140",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2141",
      "to_node": "node_2142",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003947)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2142",
      "to_node": "node_2143",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2143",
      "to_node": "node_2144",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2144",
      "to_node": "node_2145",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2146",
      "to_node": "node_2147",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.196)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2147",
      "to_node": "node_2148",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003561)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2148",
      "to_node": "node_2149",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2149",
      "to_node": "node_2150",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.159)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2150",
      "to_node": "node_2151",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.185)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2151",
      "to_node": "node_2152",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004966)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2152",
      "to_node": "node_2153",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2153",
      "to_node": "node_2154",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2155",
      "to_node": "node_2156",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.248)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2156",
      "to_node": "node_2157",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004544)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2157",
      "to_node": "node_2158",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.418)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2158",
      "to_node": "node_2159",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.244)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2159",
      "to_node": "node_2160",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.185)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2160",
      "to_node": "node_2161",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.351)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2161",
      "to_node": "node_2162",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.587)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2162",
      "to_node": "node_2163",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2164",
      "to_node": "node_2165",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2165",
      "to_node": "node_2166",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.362)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2166",
      "to_node": "node_2167",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2167",
      "to_node": "node_2168",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2168",
      "to_node": "node_2169",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2170",
      "to_node": "node_2171",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.527)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2171",
      "to_node": "node_2172",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004133)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2172",
      "to_node": "node_2173",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.176)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2173",
      "to_node": "node_2174",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.590)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2174",
      "to_node": "node_2175",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2176",
      "to_node": "node_2177",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.116)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2177",
      "to_node": "node_2178",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.319)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2178",
      "to_node": "node_2179",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.112)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2179",
      "to_node": "node_2180",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2180",
      "to_node": "node_2181",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2182",
      "to_node": "node_2183",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2183",
      "to_node": "node_2184",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.560)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2184",
      "to_node": "node_2185",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.202)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2185",
      "to_node": "node_2186",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.387)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2186",
      "to_node": "node_2187",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2188",
      "to_node": "node_2189",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.330)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2189",
      "to_node": "node_2190",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2190",
      "to_node": "node_2191",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2191",
      "to_node": "node_2192",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2192",
      "to_node": "node_2193",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2193",
      "to_node": "node_2194",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2195",
      "to_node": "node_2196",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005573)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2196",
      "to_node": "node_2197",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 62%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.623)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2197",
      "to_node": "node_2198",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002941)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2198",
      "to_node": "node_2199",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.124)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2199",
      "to_node": "node_2200",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2201",
      "to_node": "node_2202",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003081)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2202",
      "to_node": "node_2203",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2203",
      "to_node": "node_2204",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2204",
      "to_node": "node_2205",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2205",
      "to_node": "node_2206",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2206",
      "to_node": "node_2207",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.626)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2207",
      "to_node": "node_2208",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2208",
      "to_node": "node_2209",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2210",
      "to_node": "node_2211",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.595)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2211",
      "to_node": "node_2212",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2212",
      "to_node": "node_2213",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2213",
      "to_node": "node_2214",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004022)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2214",
      "to_node": "node_2215",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2215",
      "to_node": "node_2216",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.427)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2216",
      "to_node": "node_2217",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.658)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2217",
      "to_node": "node_2218",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2219",
      "to_node": "node_2220",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.372)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2220",
      "to_node": "node_2221",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003262)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2221",
      "to_node": "node_2222",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2222",
      "to_node": "node_2223",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.339)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2223",
      "to_node": "node_2224",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.125)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2224",
      "to_node": "node_2225",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004108)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2225",
      "to_node": "node_2226",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2226",
      "to_node": "node_2227",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2228",
      "to_node": "node_2229",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001516)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2229",
      "to_node": "node_2230",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2230",
      "to_node": "node_2231",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2231",
      "to_node": "node_2232",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2232",
      "to_node": "node_2233",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2233",
      "to_node": "node_2234",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2234",
      "to_node": "node_2235",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2236",
      "to_node": "node_2237",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.626)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2237",
      "to_node": "node_2238",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.548)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2238",
      "to_node": "node_2239",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.295)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2239",
      "to_node": "node_2240",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2241",
      "to_node": "node_2242",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2242",
      "to_node": "node_2243",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.570)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2243",
      "to_node": "node_2244",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2244",
      "to_node": "node_2245",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2245",
      "to_node": "node_2246",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2247",
      "to_node": "node_2248",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.160)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2248",
      "to_node": "node_2249",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.520)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2249",
      "to_node": "node_2250",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2250",
      "to_node": "node_2251",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2252",
      "to_node": "node_2253",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.182)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2253",
      "to_node": "node_2254",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.241)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2254",
      "to_node": "node_2255",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2255",
      "to_node": "node_2256",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.490)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2256",
      "to_node": "node_2257",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.309)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2257",
      "to_node": "node_2258",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2259",
      "to_node": "node_2260",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2260",
      "to_node": "node_2261",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2261",
      "to_node": "node_2262",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2262",
      "to_node": "node_2263",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2263",
      "to_node": "node_2264",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2265",
      "to_node": "node_2266",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003657)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2266",
      "to_node": "node_2267",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003927)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2267",
      "to_node": "node_2268",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.330)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2268",
      "to_node": "node_2269",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2269",
      "to_node": "node_2270",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2270",
      "to_node": "node_2271",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2272",
      "to_node": "node_2273",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2273",
      "to_node": "node_2274",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002922)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2274",
      "to_node": "node_2275",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2275",
      "to_node": "node_2276",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.238)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2276",
      "to_node": "node_2277",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.111)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2277",
      "to_node": "node_2278",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2279",
      "to_node": "node_2280",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2280",
      "to_node": "node_2281",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2281",
      "to_node": "node_2282",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.658)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2282",
      "to_node": "node_2283",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2284",
      "to_node": "node_2285",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2285",
      "to_node": "node_2286",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.001969)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2286",
      "to_node": "node_2287",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2287",
      "to_node": "node_2288",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2288",
      "to_node": "node_2289",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2289",
      "to_node": "node_2290",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.182)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2290",
      "to_node": "node_2291",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.538)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2291",
      "to_node": "node_2292",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2293",
      "to_node": "node_2294",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.524)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2294",
      "to_node": "node_2295",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.181)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2295",
      "to_node": "node_2296",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.140)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2296",
      "to_node": "node_2297",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2298",
      "to_node": "node_2299",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002727)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2299",
      "to_node": "node_2300",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2300",
      "to_node": "node_2301",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2301",
      "to_node": "node_2302",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2302",
      "to_node": "node_2303",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2303",
      "to_node": "node_2304",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2305",
      "to_node": "node_2306",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002883)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2306",
      "to_node": "node_2307",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2307",
      "to_node": "node_2308",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.147)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2308",
      "to_node": "node_2309",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2309",
      "to_node": "node_2310",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2310",
      "to_node": "node_2311",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2311",
      "to_node": "node_2312",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2313",
      "to_node": "node_2314",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001521)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2314",
      "to_node": "node_2315",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.245)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2315",
      "to_node": "node_2316",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.256)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2316",
      "to_node": "node_2317",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.114)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2317",
      "to_node": "node_2318",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.567)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2318",
      "to_node": "node_2319",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2320",
      "to_node": "node_2321",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004017)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2321",
      "to_node": "node_2322",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2322",
      "to_node": "node_2323",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2323",
      "to_node": "node_2324",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.391)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2324",
      "to_node": "node_2325",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.538)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2325",
      "to_node": "node_2326",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2326",
      "to_node": "node_2327",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2328",
      "to_node": "node_2329",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2329",
      "to_node": "node_2330",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2330",
      "to_node": "node_2331",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2331",
      "to_node": "node_2332",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2332",
      "to_node": "node_2333",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2333",
      "to_node": "node_2334",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2335",
      "to_node": "node_2336",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002594)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2336",
      "to_node": "node_2337",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2337",
      "to_node": "node_2338",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2338",
      "to_node": "node_2339",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2340",
      "to_node": "node_2341",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2341",
      "to_node": "node_2342",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.536)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2342",
      "to_node": "node_2343",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2343",
      "to_node": "node_2344",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2344",
      "to_node": "node_2345",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2346",
      "to_node": "node_2347",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2347",
      "to_node": "node_2348",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.629)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2348",
      "to_node": "node_2349",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2349",
      "to_node": "node_2350",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2350",
      "to_node": "node_2351",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2352",
      "to_node": "node_2353",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2353",
      "to_node": "node_2354",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2354",
      "to_node": "node_2355",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.133)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2355",
      "to_node": "node_2356",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.403)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2356",
      "to_node": "node_2357",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2358",
      "to_node": "node_2359",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2359",
      "to_node": "node_2360",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002766)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2360",
      "to_node": "node_2361",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.195)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2361",
      "to_node": "node_2362",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2362",
      "to_node": "node_2363",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2363",
      "to_node": "node_2364",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2364",
      "to_node": "node_2365",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2366",
      "to_node": "node_2367",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2367",
      "to_node": "node_2368",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.379)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2368",
      "to_node": "node_2369",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.497)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2369",
      "to_node": "node_2370",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2371",
      "to_node": "node_2372",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2372",
      "to_node": "node_2373",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.214)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2373",
      "to_node": "node_2374",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2374",
      "to_node": "node_2375",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2376",
      "to_node": "node_2377",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2377",
      "to_node": "node_2378",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.266)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2378",
      "to_node": "node_2379",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005068)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2379",
      "to_node": "node_2380",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2380",
      "to_node": "node_2381",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.460)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2381",
      "to_node": "node_2382",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.236)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2382",
      "to_node": "node_2383",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.471)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2383",
      "to_node": "node_2384",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2385",
      "to_node": "node_2386",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2386",
      "to_node": "node_2387",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2387",
      "to_node": "node_2388",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.401)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2388",
      "to_node": "node_2389",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.613)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2389",
      "to_node": "node_2390",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2390",
      "to_node": "node_2391",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.379)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2391",
      "to_node": "node_2392",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2393",
      "to_node": "node_2394",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.517)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2394",
      "to_node": "node_2395",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.193)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2395",
      "to_node": "node_2396",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2396",
      "to_node": "node_2397",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2398",
      "to_node": "node_2399",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2399",
      "to_node": "node_2400",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2400",
      "to_node": "node_2401",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.608)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2401",
      "to_node": "node_2402",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004319)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2402",
      "to_node": "node_2403",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.160)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2403",
      "to_node": "node_2404",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2405",
      "to_node": "node_2406",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2406",
      "to_node": "node_2407",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2407",
      "to_node": "node_2408",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2408",
      "to_node": "node_2409",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2410",
      "to_node": "node_2411",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.151)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2411",
      "to_node": "node_2412",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.176)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2412",
      "to_node": "node_2413",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003213)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2413",
      "to_node": "node_2414",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.626)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2414",
      "to_node": "node_2415",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2416",
      "to_node": "node_2417",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004213)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2417",
      "to_node": "node_2418",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004390)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2418",
      "to_node": "node_2419",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2419",
      "to_node": "node_2420",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.350)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2420",
      "to_node": "node_2421",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2421",
      "to_node": "node_2422",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2422",
      "to_node": "node_2423",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2424",
      "to_node": "node_2425",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2425",
      "to_node": "node_2426",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2426",
      "to_node": "node_2427",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.429)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2427",
      "to_node": "node_2428",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004603)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2428",
      "to_node": "node_2429",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2429",
      "to_node": "node_2430",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2431",
      "to_node": "node_2432",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2432",
      "to_node": "node_2433",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2433",
      "to_node": "node_2434",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2434",
      "to_node": "node_2435",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2436",
      "to_node": "node_2437",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.357)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2437",
      "to_node": "node_2438",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.538)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2438",
      "to_node": "node_2439",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.188)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2439",
      "to_node": "node_2440",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.206)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2440",
      "to_node": "node_2441",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.656)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2441",
      "to_node": "node_2442",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 62%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.618)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2442",
      "to_node": "node_2443",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2443",
      "to_node": "node_2444",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2445",
      "to_node": "node_2446",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.264)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2446",
      "to_node": "node_2447",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.340)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2447",
      "to_node": "node_2448",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002741)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2448",
      "to_node": "node_2449",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004329)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2449",
      "to_node": "node_2450",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.206)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2450",
      "to_node": "node_2451",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2451",
      "to_node": "node_2452",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2452",
      "to_node": "node_2453",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2454",
      "to_node": "node_2455",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2455",
      "to_node": "node_2456",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2456",
      "to_node": "node_2457",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2457",
      "to_node": "node_2458",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2458",
      "to_node": "node_2459",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.631)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2459",
      "to_node": "node_2460",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2461",
      "to_node": "node_2462",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.195)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2462",
      "to_node": "node_2463",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.122)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2463",
      "to_node": "node_2464",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2464",
      "to_node": "node_2465",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2466",
      "to_node": "node_2467",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002262)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2467",
      "to_node": "node_2468",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.135)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2468",
      "to_node": "node_2469",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.287)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2469",
      "to_node": "node_2470",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.196)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2470",
      "to_node": "node_2471",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2471",
      "to_node": "node_2472",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.379)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2472",
      "to_node": "node_2473",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2474",
      "to_node": "node_2475",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2475",
      "to_node": "node_2476",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004846)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2476",
      "to_node": "node_2477",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004104)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2477",
      "to_node": "node_2478",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2478",
      "to_node": "node_2479",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2479",
      "to_node": "node_2480",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2481",
      "to_node": "node_2482",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2482",
      "to_node": "node_2483",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2483",
      "to_node": "node_2484",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2484",
      "to_node": "node_2485",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.502)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2485",
      "to_node": "node_2486",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2486",
      "to_node": "node_2487",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2488",
      "to_node": "node_2489",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2489",
      "to_node": "node_2490",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2490",
      "to_node": "node_2491",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2491",
      "to_node": "node_2492",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2493",
      "to_node": "node_2494",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003772)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2494",
      "to_node": "node_2495",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004051)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2495",
      "to_node": "node_2496",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003888)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2496",
      "to_node": "node_2497",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2497",
      "to_node": "node_2498",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.289)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2498",
      "to_node": "node_2499",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2500",
      "to_node": "node_2501",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004501)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2501",
      "to_node": "node_2502",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005625)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2502",
      "to_node": "node_2503",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.114)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2503",
      "to_node": "node_2504",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2504",
      "to_node": "node_2505",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2506",
      "to_node": "node_2507",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.119)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2507",
      "to_node": "node_2508",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005123)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2508",
      "to_node": "node_2509",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004040)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2509",
      "to_node": "node_2510",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2510",
      "to_node": "node_2511",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2512",
      "to_node": "node_2513",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002560)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2513",
      "to_node": "node_2514",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.264)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2514",
      "to_node": "node_2515",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2515",
      "to_node": "node_2516",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.199)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2516",
      "to_node": "node_2517",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2518",
      "to_node": "node_2519",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.381)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2519",
      "to_node": "node_2520",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.131)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2520",
      "to_node": "node_2521",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.312)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2521",
      "to_node": "node_2522",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004146)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2522",
      "to_node": "node_2523",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2523",
      "to_node": "node_2524",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2525",
      "to_node": "node_2526",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004320)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2526",
      "to_node": "node_2527",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.357)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2527",
      "to_node": "node_2528",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004639)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2528",
      "to_node": "node_2529",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005399)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2529",
      "to_node": "node_2530",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.160)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2530",
      "to_node": "node_2531",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2532",
      "to_node": "node_2533",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.364)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2533",
      "to_node": "node_2534",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2534",
      "to_node": "node_2535",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2535",
      "to_node": "node_2536",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002953)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2536",
      "to_node": "node_2537",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.120)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2537",
      "to_node": "node_2538",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2539",
      "to_node": "node_2540",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2540",
      "to_node": "node_2541",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2541",
      "to_node": "node_2542",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2543",
      "to_node": "node_2544",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 62%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.618)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2544",
      "to_node": "node_2545",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.404)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2545",
      "to_node": "node_2546",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.466)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2546",
      "to_node": "node_2547",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2547",
      "to_node": "node_2548",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2549",
      "to_node": "node_2550",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2550",
      "to_node": "node_2551",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.560)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2551",
      "to_node": "node_2552",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.484)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2552",
      "to_node": "node_2553",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2553",
      "to_node": "node_2554",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2554",
      "to_node": "node_2555",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2556",
      "to_node": "node_2557",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004621)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2557",
      "to_node": "node_2558",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.130)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2558",
      "to_node": "node_2559",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.541)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2559",
      "to_node": "node_2560",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2560",
      "to_node": "node_2561",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2562",
      "to_node": "node_2563",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2563",
      "to_node": "node_2564",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.385)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2564",
      "to_node": "node_2565",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2565",
      "to_node": "node_2566",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004455)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2566",
      "to_node": "node_2567",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.208)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2567",
      "to_node": "node_2568",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2568",
      "to_node": "node_2569",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2569",
      "to_node": "node_2570",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2571",
      "to_node": "node_2572",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.120)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2572",
      "to_node": "node_2573",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2573",
      "to_node": "node_2574",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.205)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2574",
      "to_node": "node_2575",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004264)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2575",
      "to_node": "node_2576",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.493)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2576",
      "to_node": "node_2577",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2577",
      "to_node": "node_2578",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2578",
      "to_node": "node_2579",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2580",
      "to_node": "node_2581",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.147)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2581",
      "to_node": "node_2582",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.639)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2582",
      "to_node": "node_2583",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.295)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2583",
      "to_node": "node_2584",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003833)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2584",
      "to_node": "node_2585",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2585",
      "to_node": "node_2586",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2586",
      "to_node": "node_2587",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2588",
      "to_node": "node_2589",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.172)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2589",
      "to_node": "node_2590",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2590",
      "to_node": "node_2591",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2591",
      "to_node": "node_2592",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2592",
      "to_node": "node_2593",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2594",
      "to_node": "node_2595",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.377)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2595",
      "to_node": "node_2596",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.337)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2596",
      "to_node": "node_2597",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003766)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2597",
      "to_node": "node_2598",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2598",
      "to_node": "node_2599",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2599",
      "to_node": "node_2600",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2601",
      "to_node": "node_2602",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.468)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2602",
      "to_node": "node_2603",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2603",
      "to_node": "node_2604",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2604",
      "to_node": "node_2605",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.120)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2605",
      "to_node": "node_2606",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004536)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2606",
      "to_node": "node_2607",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.151)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2607",
      "to_node": "node_2608",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2609",
      "to_node": "node_2610",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.220)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2610",
      "to_node": "node_2611",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 62%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.618)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2611",
      "to_node": "node_2612",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2612",
      "to_node": "node_2613",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.570)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2613",
      "to_node": "node_2614",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2615",
      "to_node": "node_2616",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.166)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2616",
      "to_node": "node_2617",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003223)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2617",
      "to_node": "node_2618",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2618",
      "to_node": "node_2619",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.248)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2619",
      "to_node": "node_2620",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2621",
      "to_node": "node_2622",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.155)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2622",
      "to_node": "node_2623",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2623",
      "to_node": "node_2624",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.376)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2624",
      "to_node": "node_2625",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2626",
      "to_node": "node_2627",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2627",
      "to_node": "node_2628",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2628",
      "to_node": "node_2629",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2629",
      "to_node": "node_2630",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2631",
      "to_node": "node_2632",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2632",
      "to_node": "node_2633",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004488)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2633",
      "to_node": "node_2634",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.117)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2634",
      "to_node": "node_2635",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2636",
      "to_node": "node_2637",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.122)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2637",
      "to_node": "node_2638",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2638",
      "to_node": "node_2639",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.475)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2639",
      "to_node": "node_2640",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.312)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2640",
      "to_node": "node_2641",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2641",
      "to_node": "node_2642",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2642",
      "to_node": "node_2643",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2644",
      "to_node": "node_2645",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2645",
      "to_node": "node_2646",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004370)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2646",
      "to_node": "node_2647",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2647",
      "to_node": "node_2648",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2649",
      "to_node": "node_2650",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.129)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2650",
      "to_node": "node_2651",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2651",
      "to_node": "node_2652",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004616)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2652",
      "to_node": "node_2653",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2653",
      "to_node": "node_2654",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.139)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2654",
      "to_node": "node_2655",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.287)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2655",
      "to_node": "node_2656",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2657",
      "to_node": "node_2658",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2658",
      "to_node": "node_2659",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004607)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2659",
      "to_node": "node_2660",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.168)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2660",
      "to_node": "node_2661",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2662",
      "to_node": "node_2663",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.287)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2663",
      "to_node": "node_2664",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.408)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2664",
      "to_node": "node_2665",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.127)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2665",
      "to_node": "node_2666",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2667",
      "to_node": "node_2668",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.431)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2668",
      "to_node": "node_2669",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004256)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2669",
      "to_node": "node_2670",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.391)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2670",
      "to_node": "node_2671",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2671",
      "to_node": "node_2672",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.431)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2672",
      "to_node": "node_2673",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2673",
      "to_node": "node_2674",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2675",
      "to_node": "node_2676",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003902)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2676",
      "to_node": "node_2677",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2677",
      "to_node": "node_2678",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.170)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2678",
      "to_node": "node_2679",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.003938)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2679",
      "to_node": "node_2680",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.565)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2680",
      "to_node": "node_2681",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2682",
      "to_node": "node_2683",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003721)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2683",
      "to_node": "node_2684",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2684",
      "to_node": "node_2685",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.567)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2685",
      "to_node": "node_2686",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2686",
      "to_node": "node_2687",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2688",
      "to_node": "node_2689",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.353)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2689",
      "to_node": "node_2690",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.585)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2690",
      "to_node": "node_2691",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.335)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2691",
      "to_node": "node_2692",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2692",
      "to_node": "node_2693",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2693",
      "to_node": "node_2694",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2695",
      "to_node": "node_2696",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2696",
      "to_node": "node_2697",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.196)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2697",
      "to_node": "node_2698",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.536)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2698",
      "to_node": "node_2699",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2699",
      "to_node": "node_2700",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.364)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2700",
      "to_node": "node_2701",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.227)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2701",
      "to_node": "node_2702",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.346)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2702",
      "to_node": "node_2703",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2704",
      "to_node": "node_2705",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2705",
      "to_node": "node_2706",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003865)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2706",
      "to_node": "node_2707",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2707",
      "to_node": "node_2708",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2708",
      "to_node": "node_2709",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2710",
      "to_node": "node_2711",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2711",
      "to_node": "node_2712",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2712",
      "to_node": "node_2713",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2713",
      "to_node": "node_2714",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2714",
      "to_node": "node_2715",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2716",
      "to_node": "node_2717",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2717",
      "to_node": "node_2718",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2718",
      "to_node": "node_2719",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.364)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2719",
      "to_node": "node_2720",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2721",
      "to_node": "node_2722",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003447)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2722",
      "to_node": "node_2723",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.443)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2723",
      "to_node": "node_2724",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.259)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2724",
      "to_node": "node_2725",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2725",
      "to_node": "node_2726",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2726",
      "to_node": "node_2727",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2727",
      "to_node": "node_2728",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2729",
      "to_node": "node_2730",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004440)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2730",
      "to_node": "node_2731",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002727)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2731",
      "to_node": "node_2732",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.410)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2732",
      "to_node": "node_2733",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2733",
      "to_node": "node_2734",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004307)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2734",
      "to_node": "node_2735",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2735",
      "to_node": "node_2736",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2737",
      "to_node": "node_2738",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2738",
      "to_node": "node_2739",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.389)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2739",
      "to_node": "node_2740",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2740",
      "to_node": "node_2741",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.175)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2741",
      "to_node": "node_2742",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2743",
      "to_node": "node_2744",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2744",
      "to_node": "node_2745",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.656)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2745",
      "to_node": "node_2746",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2746",
      "to_node": "node_2747",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2748",
      "to_node": "node_2749",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2749",
      "to_node": "node_2750",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2750",
      "to_node": "node_2751",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2751",
      "to_node": "node_2752",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.395)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2752",
      "to_node": "node_2753",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.361)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2753",
      "to_node": "node_2754",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004432)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2754",
      "to_node": "node_2755",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2755",
      "to_node": "node_2756",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2757",
      "to_node": "node_2758",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2758",
      "to_node": "node_2759",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2759",
      "to_node": "node_2760",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.664)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2760",
      "to_node": "node_2761",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2761",
      "to_node": "node_2762",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.387)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2762",
      "to_node": "node_2763",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.645)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2763",
      "to_node": "node_2764",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2765",
      "to_node": "node_2766",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.002296)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2766",
      "to_node": "node_2767",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2767",
      "to_node": "node_2768",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.305)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2768",
      "to_node": "node_2769",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2769",
      "to_node": "node_2770",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003270)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2770",
      "to_node": "node_2771",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2771",
      "to_node": "node_2772",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.272)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2772",
      "to_node": "node_2773",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2774",
      "to_node": "node_2775",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.117)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2775",
      "to_node": "node_2776",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2776",
      "to_node": "node_2777",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2777",
      "to_node": "node_2778",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 45%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.451)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2778",
      "to_node": "node_2779",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2779",
      "to_node": "node_2780",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2780",
      "to_node": "node_2781",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.381)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2781",
      "to_node": "node_2782",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2783",
      "to_node": "node_2784",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.131)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2784",
      "to_node": "node_2785",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.230)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2785",
      "to_node": "node_2786",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004207)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2786",
      "to_node": "node_2787",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.156)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2787",
      "to_node": "node_2788",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2789",
      "to_node": "node_2790",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003733)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2790",
      "to_node": "node_2791",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2791",
      "to_node": "node_2792",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.285)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2792",
      "to_node": "node_2793",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.259)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2793",
      "to_node": "node_2794",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2794",
      "to_node": "node_2795",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.387)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2795",
      "to_node": "node_2796",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2796",
      "to_node": "node_2797",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2798",
      "to_node": "node_2799",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2799",
      "to_node": "node_2800",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002424)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2800",
      "to_node": "node_2801",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003675)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2801",
      "to_node": "node_2802",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003830)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2802",
      "to_node": "node_2803",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.157)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2803",
      "to_node": "node_2804",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005320)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2804",
      "to_node": "node_2805",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2805",
      "to_node": "node_2806",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2807",
      "to_node": "node_2808",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.381)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2808",
      "to_node": "node_2809",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.468)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2809",
      "to_node": "node_2810",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.284)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2810",
      "to_node": "node_2811",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2812",
      "to_node": "node_2813",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.427)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2813",
      "to_node": "node_2814",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003447)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2814",
      "to_node": "node_2815",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.119)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2815",
      "to_node": "node_2816",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004965)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2816",
      "to_node": "node_2817",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2817",
      "to_node": "node_2818",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2819",
      "to_node": "node_2820",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.305)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2820",
      "to_node": "node_2821",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001838)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2821",
      "to_node": "node_2822",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.002786)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2822",
      "to_node": "node_2823",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2823",
      "to_node": "node_2824",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.209)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2824",
      "to_node": "node_2825",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2825",
      "to_node": "node_2826",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2827",
      "to_node": "node_2828",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.145)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2828",
      "to_node": "node_2829",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005043)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2829",
      "to_node": "node_2830",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2830",
      "to_node": "node_2831",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.527)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2831",
      "to_node": "node_2832",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2832",
      "to_node": "node_2833",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2834",
      "to_node": "node_2835",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.195)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2835",
      "to_node": "node_2836",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.325)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2836",
      "to_node": "node_2837",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.608)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2837",
      "to_node": "node_2838",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.274)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2838",
      "to_node": "node_2839",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2839",
      "to_node": "node_2840",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2840",
      "to_node": "node_2841",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2841",
      "to_node": "node_2842",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2843",
      "to_node": "node_2844",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2844",
      "to_node": "node_2845",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.161)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2845",
      "to_node": "node_2846",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2846",
      "to_node": "node_2847",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2847",
      "to_node": "node_2848",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.631)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2848",
      "to_node": "node_2849",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2850",
      "to_node": "node_2851",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2851",
      "to_node": "node_2852",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.195)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2852",
      "to_node": "node_2853",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2853",
      "to_node": "node_2854",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2855",
      "to_node": "node_2856",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.366)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2856",
      "to_node": "node_2857",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.112)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2857",
      "to_node": "node_2858",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2858",
      "to_node": "node_2859",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 60%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.600)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2859",
      "to_node": "node_2860",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.493)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2860",
      "to_node": "node_2861",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2862",
      "to_node": "node_2863",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.302)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2863",
      "to_node": "node_2864",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2864",
      "to_node": "node_2865",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.157)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2865",
      "to_node": "node_2866",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.471)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2866",
      "to_node": "node_2867",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2868",
      "to_node": "node_2869",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2869",
      "to_node": "node_2870",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2870",
      "to_node": "node_2871",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.479)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2871",
      "to_node": "node_2872",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2872",
      "to_node": "node_2873",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2873",
      "to_node": "node_2874",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2875",
      "to_node": "node_2876",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2876",
      "to_node": "node_2877",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2877",
      "to_node": "node_2878",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2878",
      "to_node": "node_2879",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005324)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2879",
      "to_node": "node_2880",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002810)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2880",
      "to_node": "node_2881",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004575)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2881",
      "to_node": "node_2882",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.176)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2882",
      "to_node": "node_2883",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2884",
      "to_node": "node_2885",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003483)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2885",
      "to_node": "node_2886",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.479)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2886",
      "to_node": "node_2887",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2887",
      "to_node": "node_2888",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004838)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2888",
      "to_node": "node_2889",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.112)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2889",
      "to_node": "node_2890",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2891",
      "to_node": "node_2892",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2892",
      "to_node": "node_2893",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.225)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2893",
      "to_node": "node_2894",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.153)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2894",
      "to_node": "node_2895",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.236)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2895",
      "to_node": "node_2896",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2896",
      "to_node": "node_2897",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.435)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2897",
      "to_node": "node_2898",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.217)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2898",
      "to_node": "node_2899",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2900",
      "to_node": "node_2901",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.279)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2901",
      "to_node": "node_2902",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2902",
      "to_node": "node_2903",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2903",
      "to_node": "node_2904",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2905",
      "to_node": "node_2906",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.188)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2906",
      "to_node": "node_2907",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2907",
      "to_node": "node_2908",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.192)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2908",
      "to_node": "node_2909",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2910",
      "to_node": "node_2911",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001472)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2911",
      "to_node": "node_2912",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.155)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2912",
      "to_node": "node_2913",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.208)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2913",
      "to_node": "node_2914",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2914",
      "to_node": "node_2915",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.305)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2915",
      "to_node": "node_2916",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.486)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2916",
      "to_node": "node_2917",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2917",
      "to_node": "node_2918",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2919",
      "to_node": "node_2920",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.393)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2920",
      "to_node": "node_2921",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005016)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2921",
      "to_node": "node_2922",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.361)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2922",
      "to_node": "node_2923",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2923",
      "to_node": "node_2924",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.230)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2924",
      "to_node": "node_2925",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2925",
      "to_node": "node_2926",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2926",
      "to_node": "node_2927",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2928",
      "to_node": "node_2929",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2929",
      "to_node": "node_2930",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003729)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2930",
      "to_node": "node_2931",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2931",
      "to_node": "node_2932",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2932",
      "to_node": "node_2933",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.125)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2933",
      "to_node": "node_2934",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 62%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.623)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2934",
      "to_node": "node_2935",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2935",
      "to_node": "node_2936",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2937",
      "to_node": "node_2938",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.149)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2938",
      "to_node": "node_2939",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.479)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2939",
      "to_node": "node_2940",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004173)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2940",
      "to_node": "node_2941",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.166)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2941",
      "to_node": "node_2942",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2943",
      "to_node": "node_2944",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2944",
      "to_node": "node_2945",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.176)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2945",
      "to_node": "node_2946",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.379)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2946",
      "to_node": "node_2947",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2947",
      "to_node": "node_2948",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2948",
      "to_node": "node_2949",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2950",
      "to_node": "node_2951",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002236)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2951",
      "to_node": "node_2952",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2952",
      "to_node": "node_2953",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005187)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2953",
      "to_node": "node_2954",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.567)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2954",
      "to_node": "node_2955",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.208)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2955",
      "to_node": "node_2956",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2956",
      "to_node": "node_2957",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2958",
      "to_node": "node_2959",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003076)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2959",
      "to_node": "node_2960",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003844)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2960",
      "to_node": "node_2961",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.479)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2961",
      "to_node": "node_2962",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002029)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2962",
      "to_node": "node_2963",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.314)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2963",
      "to_node": "node_2964",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004341)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2964",
      "to_node": "node_2965",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2965",
      "to_node": "node_2966",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2967",
      "to_node": "node_2968",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2968",
      "to_node": "node_2969",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.312)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2969",
      "to_node": "node_2970",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2970",
      "to_node": "node_2971",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2972",
      "to_node": "node_2973",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2973",
      "to_node": "node_2974",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.326)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2974",
      "to_node": "node_2975",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.572)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2975",
      "to_node": "node_2976",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2977",
      "to_node": "node_2978",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.420)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2978",
      "to_node": "node_2979",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.121)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2979",
      "to_node": "node_2980",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.297)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2980",
      "to_node": "node_2981",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.277)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2981",
      "to_node": "node_2982",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2983",
      "to_node": "node_2984",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.263)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2984",
      "to_node": "node_2985",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2985",
      "to_node": "node_2986",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.328)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2986",
      "to_node": "node_2987",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2987",
      "to_node": "node_2988",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.645)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2988",
      "to_node": "node_2989",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2990",
      "to_node": "node_2991",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004181)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2991",
      "to_node": "node_2992",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004790)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2992",
      "to_node": "node_2993",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.287)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2993",
      "to_node": "node_2994",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2994",
      "to_node": "node_2995",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2995",
      "to_node": "node_2996",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2997",
      "to_node": "node_2998",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002572)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2998",
      "to_node": "node_2999",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.200)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_2999",
      "to_node": "node_3000",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3000",
      "to_node": "node_3001",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.126)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3001",
      "to_node": "node_3002",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3002",
      "to_node": "node_3003",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.142)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3003",
      "to_node": "node_3004",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3005",
      "to_node": "node_3006",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.129)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3006",
      "to_node": "node_3007",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004449)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3007",
      "to_node": "node_3008",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 48%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.484)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3008",
      "to_node": "node_3009",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005337)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3009",
      "to_node": "node_3010",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.005253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3010",
      "to_node": "node_3011",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.174)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3011",
      "to_node": "node_3012",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3013",
      "to_node": "node_3014",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3014",
      "to_node": "node_3015",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.244)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3015",
      "to_node": "node_3016",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3016",
      "to_node": "node_3017",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 60%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.597)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3017",
      "to_node": "node_3018",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3019",
      "to_node": "node_3020",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.166)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3020",
      "to_node": "node_3021",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.127)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3021",
      "to_node": "node_3022",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.129)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3022",
      "to_node": "node_3023",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.473)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3023",
      "to_node": "node_3024",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3024",
      "to_node": "node_3025",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 44%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.441)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3025",
      "to_node": "node_3026",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3026",
      "to_node": "node_3027",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3028",
      "to_node": "node_3029",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.608)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3029",
      "to_node": "node_3030",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.143)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3030",
      "to_node": "node_3031",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3031",
      "to_node": "node_3032",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.202)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3032",
      "to_node": "node_3033",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.181)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3033",
      "to_node": "node_3034",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3034",
      "to_node": "node_3035",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3036",
      "to_node": "node_3037",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.175)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3037",
      "to_node": "node_3038",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.330)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3038",
      "to_node": "node_3039",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.195)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3039",
      "to_node": "node_3040",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3041",
      "to_node": "node_3042",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3042",
      "to_node": "node_3043",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.126)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3043",
      "to_node": "node_3044",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003479)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3044",
      "to_node": "node_3045",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3045",
      "to_node": "node_3046",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3046",
      "to_node": "node_3047",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.188)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3047",
      "to_node": "node_3048",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3048",
      "to_node": "node_3049",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3050",
      "to_node": "node_3051",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.189)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3051",
      "to_node": "node_3052",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004063)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3052",
      "to_node": "node_3053",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.328)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3053",
      "to_node": "node_3054",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004710)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3054",
      "to_node": "node_3055",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.143)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3055",
      "to_node": "node_3056",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3056",
      "to_node": "node_3057",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3058",
      "to_node": "node_3059",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3059",
      "to_node": "node_3060",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3060",
      "to_node": "node_3061",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3061",
      "to_node": "node_3062",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.497)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3062",
      "to_node": "node_3063",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3063",
      "to_node": "node_3064",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3065",
      "to_node": "node_3066",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003876)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3066",
      "to_node": "node_3067",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 36%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.355)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3067",
      "to_node": "node_3068",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002557)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3068",
      "to_node": "node_3069",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.136)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3069",
      "to_node": "node_3070",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3070",
      "to_node": "node_3071",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3072",
      "to_node": "node_3073",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.120)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3073",
      "to_node": "node_3074",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004051)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3074",
      "to_node": "node_3075",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.238)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3075",
      "to_node": "node_3076",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3076",
      "to_node": "node_3077",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3077",
      "to_node": "node_3078",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3079",
      "to_node": "node_3080",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.003186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3080",
      "to_node": "node_3081",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.429)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3081",
      "to_node": "node_3082",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3082",
      "to_node": "node_3083",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3083",
      "to_node": "node_3084",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.337)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3084",
      "to_node": "node_3085",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3085",
      "to_node": "node_3086",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3087",
      "to_node": "node_3088",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003917)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3088",
      "to_node": "node_3089",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.333)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3089",
      "to_node": "node_3090",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3090",
      "to_node": "node_3091",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.661)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3091",
      "to_node": "node_3092",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3092",
      "to_node": "node_3093",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.577)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3093",
      "to_node": "node_3094",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3095",
      "to_node": "node_3096",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.114)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3096",
      "to_node": "node_3097",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3097",
      "to_node": "node_3098",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003880)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3098",
      "to_node": "node_3099",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3099",
      "to_node": "node_3100",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3101",
      "to_node": "node_3102",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.321)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3102",
      "to_node": "node_3103",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.497)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3103",
      "to_node": "node_3104",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003401)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3104",
      "to_node": "node_3105",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 54%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.536)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3105",
      "to_node": "node_3106",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3107",
      "to_node": "node_3108",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3108",
      "to_node": "node_3109",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3109",
      "to_node": "node_3110",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3110",
      "to_node": "node_3111",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.431)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3111",
      "to_node": "node_3112",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.529)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3112",
      "to_node": "node_3113",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3114",
      "to_node": "node_3115",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.295)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3115",
      "to_node": "node_3116",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.466)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3116",
      "to_node": "node_3117",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.431)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3117",
      "to_node": "node_3118",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3118",
      "to_node": "node_3119",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.458)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3119",
      "to_node": "node_3120",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3120",
      "to_node": "node_3121",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 65%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.653)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3121",
      "to_node": "node_3122",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3123",
      "to_node": "node_3124",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.214)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3124",
      "to_node": "node_3125",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 34%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.342)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3125",
      "to_node": "node_3126",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3126",
      "to_node": "node_3127",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3127",
      "to_node": "node_3128",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.490)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3128",
      "to_node": "node_3129",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.318)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3129",
      "to_node": "node_3130",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.147)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3130",
      "to_node": "node_3131",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3132",
      "to_node": "node_3133",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004695)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3133",
      "to_node": "node_3134",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004839)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3134",
      "to_node": "node_3135",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002973)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3135",
      "to_node": "node_3136",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.353)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3136",
      "to_node": "node_3137",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.112)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3137",
      "to_node": "node_3138",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3139",
      "to_node": "node_3140",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 65%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.653)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3140",
      "to_node": "node_3141",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.295)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3141",
      "to_node": "node_3142",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002669)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3142",
      "to_node": "node_3143",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3143",
      "to_node": "node_3144",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3145",
      "to_node": "node_3146",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3146",
      "to_node": "node_3147",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.486)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3147",
      "to_node": "node_3148",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3148",
      "to_node": "node_3149",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3149",
      "to_node": "node_3150",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3150",
      "to_node": "node_3151",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3152",
      "to_node": "node_3153",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3153",
      "to_node": "node_3154",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.522)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3154",
      "to_node": "node_3155",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3155",
      "to_node": "node_3156",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3156",
      "to_node": "node_3157",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3158",
      "to_node": "node_3159",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.414)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3159",
      "to_node": "node_3160",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.116)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3160",
      "to_node": "node_3161",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.136)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3161",
      "to_node": "node_3162",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.115)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3162",
      "to_node": "node_3163",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.164)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3163",
      "to_node": "node_3164",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.637)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3164",
      "to_node": "node_3165",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3166",
      "to_node": "node_3167",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 49%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.488)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3167",
      "to_node": "node_3168",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.238)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3168",
      "to_node": "node_3169",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.205)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3169",
      "to_node": "node_3170",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.656)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3170",
      "to_node": "node_3171",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3171",
      "to_node": "node_3172",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3173",
      "to_node": "node_3174",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3174",
      "to_node": "node_3175",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004449)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3175",
      "to_node": "node_3176",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.140)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3176",
      "to_node": "node_3177",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3177",
      "to_node": "node_3178",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3178",
      "to_node": "node_3179",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3180",
      "to_node": "node_3181",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.261)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3181",
      "to_node": "node_3182",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004578)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3182",
      "to_node": "node_3183",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.140)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3183",
      "to_node": "node_3184",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3185",
      "to_node": "node_3186",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3186",
      "to_node": "node_3187",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003884)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3187",
      "to_node": "node_3188",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.290)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3188",
      "to_node": "node_3189",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.645)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3189",
      "to_node": "node_3190",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3190",
      "to_node": "node_3191",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3192",
      "to_node": "node_3193",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3193",
      "to_node": "node_3194",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.143)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3194",
      "to_node": "node_3195",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3195",
      "to_node": "node_3196",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3196",
      "to_node": "node_3197",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3197",
      "to_node": "node_3198",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.117)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3198",
      "to_node": "node_3199",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3200",
      "to_node": "node_3201",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 35%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.346)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3201",
      "to_node": "node_3202",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 61%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.610)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3202",
      "to_node": "node_3203",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.326)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3203",
      "to_node": "node_3204",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.002846)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3204",
      "to_node": "node_3205",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3205",
      "to_node": "node_3206",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3206",
      "to_node": "node_3207",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3207",
      "to_node": "node_3208",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3209",
      "to_node": "node_3210",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.125)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3210",
      "to_node": "node_3211",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.422)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3211",
      "to_node": "node_3212",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.302)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3212",
      "to_node": "node_3213",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3214",
      "to_node": "node_3215",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.002583)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3215",
      "to_node": "node_3216",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.004251)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3216",
      "to_node": "node_3217",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3217",
      "to_node": "node_3218",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.178)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3218",
      "to_node": "node_3219",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004369)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3219",
      "to_node": "node_3220",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.232)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3220",
      "to_node": "node_3221",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3222",
      "to_node": "node_3223",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003487)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3223",
      "to_node": "node_3224",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004441)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3224",
      "to_node": "node_3225",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.212)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3225",
      "to_node": "node_3226",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3226",
      "to_node": "node_3227",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3227",
      "to_node": "node_3228",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3228",
      "to_node": "node_3229",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3230",
      "to_node": "node_3231",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.190)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3231",
      "to_node": "node_3232",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002482)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3232",
      "to_node": "node_3233",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3233",
      "to_node": "node_3234",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.562)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3234",
      "to_node": "node_3235",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3236",
      "to_node": "node_3237",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.188)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3237",
      "to_node": "node_3238",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.198)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3238",
      "to_node": "node_3239",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.309)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3239",
      "to_node": "node_3240",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004328)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3240",
      "to_node": "node_3241",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 11%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.115)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3241",
      "to_node": "node_3242",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.372)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3242",
      "to_node": "node_3243",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3243",
      "to_node": "node_3244",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3245",
      "to_node": "node_3246",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.252)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3246",
      "to_node": "node_3247",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002880)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3247",
      "to_node": "node_3248",
      "edge_type": "modification",
      "reasoning": "Increase 10 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(10, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3248",
      "to_node": "node_3249",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.148)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3249",
      "to_node": "node_3250",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.412)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3250",
      "to_node": "node_3251",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3252",
      "to_node": "node_3253",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3253",
      "to_node": "node_3254",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3254",
      "to_node": "node_3255",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.138)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3255",
      "to_node": "node_3256",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3256",
      "to_node": "node_3257",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3257",
      "to_node": "node_3258",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3259",
      "to_node": "node_3260",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 47%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.473)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3260",
      "to_node": "node_3261",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3261",
      "to_node": "node_3262",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.377)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3262",
      "to_node": "node_3263",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004430)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3263",
      "to_node": "node_3264",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.179)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3264",
      "to_node": "node_3265",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3265",
      "to_node": "node_3266",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3267",
      "to_node": "node_3268",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004345)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3268",
      "to_node": "node_3269",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.368)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3269",
      "to_node": "node_3270",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004216)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3270",
      "to_node": "node_3271",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.458)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3271",
      "to_node": "node_3272",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 19%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.186)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3272",
      "to_node": "node_3273",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3273",
      "to_node": "node_3274",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3274",
      "to_node": "node_3275",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3276",
      "to_node": "node_3277",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.316)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3277",
      "to_node": "node_3278",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3278",
      "to_node": "node_3279",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3279",
      "to_node": "node_3280",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3280",
      "to_node": "node_3281",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3281",
      "to_node": "node_3282",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3283",
      "to_node": "node_3284",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3284",
      "to_node": "node_3285",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.524)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3285",
      "to_node": "node_3286",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.269)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3286",
      "to_node": "node_3287",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3288",
      "to_node": "node_3289",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.130)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3289",
      "to_node": "node_3290",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 52%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.524)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3290",
      "to_node": "node_3291",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.435)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3291",
      "to_node": "node_3292",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3292",
      "to_node": "node_3293",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3294",
      "to_node": "node_3295",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.229)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3295",
      "to_node": "node_3296",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.005072)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3296",
      "to_node": "node_3297",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.548)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3297",
      "to_node": "node_3298",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.235)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3298",
      "to_node": "node_3299",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3300",
      "to_node": "node_3301",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003205)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3301",
      "to_node": "node_3302",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.323)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3302",
      "to_node": "node_3303",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.182)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3303",
      "to_node": "node_3304",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3305",
      "to_node": "node_3306",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 43%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.431)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3306",
      "to_node": "node_3307",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.202)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3307",
      "to_node": "node_3308",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 40%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.403)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3308",
      "to_node": "node_3309",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 57%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.570)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3309",
      "to_node": "node_3310",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3311",
      "to_node": "node_3312",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002017)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3312",
      "to_node": "node_3313",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.294)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3313",
      "to_node": "node_3314",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.267)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3314",
      "to_node": "node_3315",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3316",
      "to_node": "node_3317",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001997)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3317",
      "to_node": "node_3318",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 55%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.548)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3318",
      "to_node": "node_3319",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.149)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3319",
      "to_node": "node_3320",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.134)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3320",
      "to_node": "node_3321",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.562)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3321",
      "to_node": "node_3322",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 27%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.271)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3322",
      "to_node": "node_3323",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3324",
      "to_node": "node_3325",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3325",
      "to_node": "node_3326",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003436)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3326",
      "to_node": "node_3327",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 16%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.159)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3327",
      "to_node": "node_3328",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3328",
      "to_node": "node_3329",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3330",
      "to_node": "node_3331",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 18%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.183)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3331",
      "to_node": "node_3332",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 38%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3332",
      "to_node": "node_3333",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003472)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3333",
      "to_node": "node_3334",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.325)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3334",
      "to_node": "node_3335",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 17%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.171)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3335",
      "to_node": "node_3336",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.005222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3336",
      "to_node": "node_3337",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 51%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.511)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3337",
      "to_node": "node_3338",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3339",
      "to_node": "node_3340",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.001534)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3340",
      "to_node": "node_3341",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3341",
      "to_node": "node_3342",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.239)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3342",
      "to_node": "node_3343",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3343",
      "to_node": "node_3344",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.222)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3344",
      "to_node": "node_3345",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 26%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.258)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3345",
      "to_node": "node_3346",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3346",
      "to_node": "node_3347",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3348",
      "to_node": "node_3349",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.004475)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3349",
      "to_node": "node_3350",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3350",
      "to_node": "node_3351",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.595)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3351",
      "to_node": "node_3352",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3352",
      "to_node": "node_3353",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3353",
      "to_node": "node_3354",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3354",
      "to_node": "node_3355",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3355",
      "to_node": "node_3356",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3357",
      "to_node": "node_3358",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3358",
      "to_node": "node_3359",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003462)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3359",
      "to_node": "node_3360",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.217)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3360",
      "to_node": "node_3361",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.289)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3361",
      "to_node": "node_3362",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.253)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3362",
      "to_node": "node_3363",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3363",
      "to_node": "node_3364",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3365",
      "to_node": "node_3366",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3366",
      "to_node": "node_3367",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.312)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3367",
      "to_node": "node_3368",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 64%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.642)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3368",
      "to_node": "node_3369",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.200)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3369",
      "to_node": "node_3370",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.126)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3370",
      "to_node": "node_3371",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 56%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.560)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3371",
      "to_node": "node_3372",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3373",
      "to_node": "node_3374",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.003276)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3374",
      "to_node": "node_3375",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 23%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.233)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3375",
      "to_node": "node_3376",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.292)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3376",
      "to_node": "node_3377",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3378",
      "to_node": "node_3379",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 25%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.255)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3379",
      "to_node": "node_3380",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3380",
      "to_node": "node_3381",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.299)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3381",
      "to_node": "node_3382",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.003596)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3382",
      "to_node": "node_3383",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.410)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3383",
      "to_node": "node_3384",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.393)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3384",
      "to_node": "node_3385",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3386",
      "to_node": "node_3387",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3387",
      "to_node": "node_3388",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 14%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.144)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3388",
      "to_node": "node_3389",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 42%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.422)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3389",
      "to_node": "node_3390",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3390",
      "to_node": "node_3391",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.282)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3391",
      "to_node": "node_3392",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3392",
      "to_node": "node_3393",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3394",
      "to_node": "node_3395",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3395",
      "to_node": "node_3396",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004863)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3396",
      "to_node": "node_3397",
      "edge_type": "modification",
      "reasoning": "Increase 6 thickness by 59%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(6, thickness, 1.592)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3397",
      "to_node": "node_3398",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3399",
      "to_node": "node_3400",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.211)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3400",
      "to_node": "node_3401",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.332)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3401",
      "to_node": "node_3402",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3402",
      "to_node": "node_3403",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3403",
      "to_node": "node_3404",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3404",
      "to_node": "node_3405",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.003306)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3405",
      "to_node": "node_3406",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3407",
      "to_node": "node_3408",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.300)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3408",
      "to_node": "node_3409",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004893)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3409",
      "to_node": "node_3410",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3410",
      "to_node": "node_3411",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 53%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.534)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3411",
      "to_node": "node_3412",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 28%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.280)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3412",
      "to_node": "node_3413",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 66%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.661)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3413",
      "to_node": "node_3414",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3415",
      "to_node": "node_3416",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3416",
      "to_node": "node_3417",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.241)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3417",
      "to_node": "node_3418",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.242)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3418",
      "to_node": "node_3419",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.005012)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3419",
      "to_node": "node_3420",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3421",
      "to_node": "node_3422",
      "edge_type": "modification",
      "reasoning": "Increase 4 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(4, thickness, 1.502)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3422",
      "to_node": "node_3423",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 0 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(0, 4, A36_Steel, Pipe, 0.037000, 0.006167)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3423",
      "to_node": "node_3424",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.215)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3424",
      "to_node": "node_3425",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3426",
      "to_node": "node_3427",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 46%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.458)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3427",
      "to_node": "node_3428",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004806)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3428",
      "to_node": "node_3429",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3429",
      "to_node": "node_3430",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3430",
      "to_node": "node_3431",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3432",
      "to_node": "node_3433",
      "edge_type": "modification",
      "reasoning": "Increase 7 thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(7, thickness, 1.289)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3433",
      "to_node": "node_3434",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.218)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3434",
      "to_node": "node_3435",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.003364)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3435",
      "to_node": "node_3436",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 24%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.236)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3436",
      "to_node": "node_3437",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.203)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3437",
      "to_node": "node_3438",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.147)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3438",
      "to_node": "node_3439",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.129)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3439",
      "to_node": "node_3440",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3441",
      "to_node": "node_3442",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.199)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3442",
      "to_node": "node_3443",
      "edge_type": "modification",
      "reasoning": "Increase 3 thickness by 62%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(3, thickness, 1.621)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3443",
      "to_node": "node_3444",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 33%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.328)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3444",
      "to_node": "node_3445",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 5, A36_Steel, Pipe, 0.031335, 0.004030)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3445",
      "to_node": "node_3446",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 3",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 3, A36_Steel, Pipe, 0.032296, 0.005383)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3446",
      "to_node": "node_3447",
      "edge_type": "modification",
      "reasoning": "Increase 9 thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(9, thickness, 1.295)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3447",
      "to_node": "node_3448",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3449",
      "to_node": "node_3450",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 20%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.196)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3450",
      "to_node": "node_3451",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.318)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3451",
      "to_node": "node_3452",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 62%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.621)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3452",
      "to_node": "node_3453",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 21%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.206)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3453",
      "to_node": "node_3454",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.006265)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3454",
      "to_node": "node_3455",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 58%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.585)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3455",
      "to_node": "node_3456",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3457",
      "to_node": "node_3458",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 12%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.120)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3458",
      "to_node": "node_3459",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.224)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3459",
      "to_node": "node_3460",
      "edge_type": "modification",
      "reasoning": "Increase 2 thickness by 31%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(2, thickness, 1.309)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3460",
      "to_node": "node_3461",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 39%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.391)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3461",
      "to_node": "node_3462",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.412)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3462",
      "to_node": "node_3463",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 22%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.221)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3463",
      "to_node": "node_3464",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3465",
      "to_node": "node_3466",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 2 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(2, 4, A36_Steel, Pipe, 0.037588, 0.004311)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3466",
      "to_node": "node_3467",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 29%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.290)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3467",
      "to_node": "node_3468",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 3 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(3, 4, A36_Steel, Pipe, 0.030073, 0.004450)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3468",
      "to_node": "node_3469",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 41%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.412)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3469",
      "to_node": "node_3470",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.004318)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3470",
      "to_node": "node_3471",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.002935)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3471",
      "to_node": "node_3472",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 13%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.126)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3472",
      "to_node": "node_3473",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3474",
      "to_node": "node_3475",
      "edge_type": "modification",
      "reasoning": "Increase 1 thickness by 63%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(1, thickness, 1.629)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3475",
      "to_node": "node_3476",
      "edge_type": "modification",
      "reasoning": "Increase 0 thickness by 37%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(0, thickness, 1.370)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3476",
      "to_node": "node_3477",
      "edge_type": "modification",
      "reasoning": "Increase 8 thickness by 32%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(8, thickness, 1.325)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3477",
      "to_node": "node_3478",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3478",
      "to_node": "node_3479",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3480",
      "to_node": "node_3481",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 1 and 4",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(1, 4, A36_Steel, Pipe, 0.019838, 0.001473)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3481",
      "to_node": "node_3482",
      "edge_type": "modification",
      "reasoning": "Add member connecting joints 4 and 5",
      "metadata": null,
      "grammar_action": "ADD_MEMBER(4, 5, A36_Steel, Pipe, 0.029180, 0.003247)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3482",
      "to_node": "node_3483",
      "edge_type": "modification",
      "reasoning": "Increase 5 thickness by 50%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(5, thickness, 1.499)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3483",
      "to_node": "node_3484",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 30%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.304)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3484",
      "to_node": "node_3485",
      "edge_type": "modification",
      "reasoning": "Increase all_members thickness by 15%",
      "metadata": null,
      "grammar_action": "SCALE_PARAM(all_members, thickness, 1.149)",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    },
    {
      "from_node": "node_3485",
      "to_node": "node_3486",
      "edge_type": "modification",
      "reasoning": "Optimal solution",
      "metadata": null,
      "grammar_action": "OPTIMAL_STATE",
      "action_type": null,
      "target_member": null,
      "parameter_name": null,
      "old_value": null,
      "new_value": null,
      "scale_factor": null
    }
  ]
}