{
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    "14": { "id": 14, "name": "HolesUnion3", "op": { "type": "Union", "left": 13, "right": 7 } },
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    "18": { "id": 18, "name": "HolesUnion7", "op": { "type": "Union", "left": 17, "right": 11 } },
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  },
  "materials": {},
  "part_materials": {},
  "roots": [{ "root": 19, "material": "default" }]
}