{
  "room": {
    "door": [
      0,
      2
    ],
    "window": [
      3,
      0
    ],
    "table": [
      3,
      2
    ],
    "A": [
      2,
      2
    ],
    "B": [
      4,
      2
    ]
  },
  "cameras": [
    [
      2,
      4
    ],
    [
      4,
      4
    ],
    [
      3,
      5
    ]
  ]
}