[
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  },
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      { "point": [ 0, 0, 1 ], "overmap": "backroom_stairs_top" }
    ],
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    "city_sizes": [ 0, -1 ],
    "occurrences": [ 15, 40 ],
    "flags": [ "BACKROOMS" ]
  },
  {
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      { "point": [ 0, 0, 2 ], "overmap": "backroom_stairs_top" }
    ],
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  },
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      { "point": [ 0, 0, 3 ], "overmap": "backroom_stairs_top" }
    ],
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    "city_sizes": [ 0, -1 ],
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    "flags": [ "BACKROOMS" ]
  },
  {
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    ],
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    "flags": [ "BACKROOMS" ]
  },
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    ],
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    "flags": [ "BACKROOMS" ]
  },
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    ],
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    "city_sizes": [ 0, -1 ],
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    "flags": [ "BACKROOMS" ]
  }
]
