[
  {
    "type": "overmap_special",
    "id": "dumpsite_mutable",
    "subtype": "mutable",
    "locations": [ "field" ],
    "city_distance": [ 4, 40 ],
    "city_sizes": [ 5, -1 ],
    "occurrences": [ 0, 3 ],
    "flags": [ "CLASSIC", "MAN_MADE", "WILDERNESS" ],
    "check_for_locations": [
      [ [ 0, 0, 0 ], [ "field" ] ],
      [ [ 1, 0, 0 ], [ "field" ] ],
      [ [ 0, 1, 0 ], [ "field" ] ],
      [ [ -1, 0, 0 ], [ "field" ] ],
      [ [ 0, -1, 0 ], [ "field" ] ]
    ],
    "joins": [ "dump_to_dump" ],
    "overmaps": {
      "dump_core": {
        "overmap": "dumpsite_north",
        "north": "dump_to_dump",
        "east": "dump_to_dump",
        "south": "dump_to_dump",
        "west": "dump_to_dump"
      },
      "dump_edge": { "overmap": "dumpsite_edge_north", "north": "dump_to_dump" },
      "dump_field": {
        "overmap": "special_field",
        "north": "dump_to_dump",
        "east": { "id": "dump_to_dump", "type": "available" },
        "south": { "id": "dump_to_dump", "type": "available" },
        "west": { "id": "dump_to_dump", "type": "available" }
      }
    },
    "root": "dump_core",
    "phases": [
      [
        { "overmap": "dump_field", "weight": 12 },
        { "overmap": "dump_edge", "weight": 20 },
        { "overmap": "dump_core", "weight": 8 }
      ]
    ]
  }
]
