{
  "chord_rulesets": 
  [
      {
        "scale_cardinality": 7,
        "rules" : [
          [0,2,4,6], [0,2,4,6,8], [0,3,6,9], [0,3,6,11],
          [0,3,6,12], [0,4,8,12], [0,6,10,16], [0,4,8,12,17]
        ]
      },
      {
        "scale_cardinality": 12,
        "rules" : [
          [0, 3, 7, 10], [0, 4, 7, 11], [0, 3, 10, 14],
          [0, 4, 11, 14],[0,5,10,15],   [0, 10, 14, 17], [0, 3, 7, 10, 14, 17],
          [0, 4, 11, 18], [0, 7, 14, 21], [0, 7, 14, 18, 21]
        ]
      },
      {
        "scale_cardinality": 5,
        "rules" : [
          [0,2,4,6],[0,3,6,9],[0,4,8,12],[0,3,6,9,12],
          [0,4,8,12,16]
        ]
      }
  ]
}