[
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    "type": "mapgen",
    "method": "json",
    "update_mapgen_id": "mx_glass_and_crystal",
    "object": {
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      "monsters": { " ": { "monster": "GROUP_CRYSTAL_FIELD", "chance": 1, "density": 0.0001 } }
    }
  },
  {
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    }
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]
