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