{
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      }
    },
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        "right": 12
      }
    },
    "14": {
      "id": 14,
      "name": "U-Channel Bracket",
      "op": {
        "type": "Difference",
        "left": 8,
        "right": 13
      }
    }
  },
  "materials": {},
  "part_materials": {},
  "roots": [
    {
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      "material": "default"
    }
  ]
}