code: function (data) {
    var inverse = [
      ['In', 'Out'],
      ['X', 'Y'],
      ['Down', 'Up'],
      ['Left', 'Right']
    ]
    var i = 0
    var size = inverse.length
    var result
    for (i; i < size; i++) {
      var index = inverse[i]
      if (index.indexOf(data) >= 0) {
        var colm = index.indexOf(data)
        result = colm === 0 ? index[1] : index[0]
      }
    }
    return result
  }
docs: (data → string)
  - generate inverse direction