{
  "shafts": 4,
  "threading": [
    1,
    2,
    3,
    4,
    1,
    2,
    3,
    4
  ],
  "liftplan": [
    [
      1,
      2
    ],
    [
      2,
      3
    ],
    [
      3,
      4
    ],
    [
      1,
      4
    ]
  ],
  "max_treadles": 4,
  "max_press": 2,
  "loom": "rising-shed"
}