{
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  "nodes": {
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    "2": {"id": 2, "name": "block_centered", "op": {"type": "Translate", "child": 1, "offset": {"x": -30, "y": -30, "z": 0}}},
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    "20": {"id": 20, "name": "holes_012", "op": {"type": "Union", "left": 19, "right": 8}},
    "21": {"id": 21, "name": "holes_0123", "op": {"type": "Union", "left": 20, "right": 10}},
    "22": {"id": 22, "name": "holes_01234", "op": {"type": "Union", "left": 21, "right": 12}},
    "23": {"id": 23, "name": "holes_012345", "op": {"type": "Union", "left": 22, "right": 14}},
    "24": {"id": 24, "name": "holes_0123456", "op": {"type": "Union", "left": 23, "right": 16}},
    "25": {"id": 25, "name": "all_holes", "op": {"type": "Union", "left": 24, "right": 18}},
    "26": {"id": 26, "name": "result", "op": {"type": "Difference", "left": 2, "right": 25}}
  },
  "materials": {},
  "part_materials": {},
  "roots": [{"root": 26, "material": "default"}]
}