{
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        "type": "Intersection",
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    },
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    },
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    "22": {
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      "id": 23,
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        "type": "Union",
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        "right": 16
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    },
    "24": {
      "id": 24,
      "name": "holes_union_2",
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        "type": "Union",
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        "right": 17
      }
    },
    "25": {
      "id": 25,
      "name": "holes_union_3",
      "op": {
        "type": "Union",
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        "right": 18
      }
    },
    "26": {
      "id": 26,
      "name": "holes_union_4",
      "op": {
        "type": "Union",
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        "right": 19
      }
    },
    "27": {
      "id": 27,
      "name": "holes_union_5",
      "op": {
        "type": "Union",
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        "right": 20
      }
    },
    "28": {
      "id": 28,
      "name": "holes_union_6",
      "op": {
        "type": "Union",
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        "right": 21
      }
    },
    "29": {
      "id": 29,
      "name": "holes_union_all",
      "op": {
        "type": "Union",
        "left": 28,
        "right": 22
      }
    },
    "30": {
      "id": 30,
      "name": "octagonal_flange_with_holes",
      "op": {
        "type": "Difference",
        "left": 6,
        "right": 29
      }
    }
  },
  "materials": {},
  "part_materials": {},
  "roots": [
    {
      "root": 30,
      "material": "default"
    }
  ]
}