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