return [ [ [ 2, 3, 4, 5 ], [ 1, 6, 7, 3 ], [ 1, 2, 8, 4 ], [ 1, 3, 9, 10 ], 
      [ 1, 10, 11, 6 ], [ 2, 5, 11, 7 ], [ 2, 6, 12, 8 ], [ 3, 7, 12, 9 ], 
      [ 4, 8, 13, 10 ], [ 4, 9, 13, 5 ], [ 5, 13, 12, 6 ], [ 7, 11, 13, 8 ], 
      [ 9, 12, 11, 10 ] ], 
  [ [ 2, 3, 4, 5 ], [ 1, 5, 6, 7 ], [ 1, 7, 8, 9 ], [ 1, 9, 10, 5 ], 
      [ 1, 4, 6, 2 ], [ 2, 5, 10, 11 ], [ 2, 11, 12, 3 ], [ 3, 12, 13, 9 ], 
      [ 3, 8, 10, 4 ], [ 4, 9, 13, 6 ], [ 6, 13, 12, 7 ], [ 7, 11, 13, 8 ], 
      [ 8, 12, 11, 10 ] ] ];