[ [ 1, 8, 9, 10, 11, 12, 13 ], [ 2, 2, 3, 4, 6, 7, 7, 8, 8, 9, 10, 11, 11, 12, 14, 15, 17, 19, 20, 21, 
      22, 23, 24, 25, 26, 27, 27, 28 ] ]