return 
[ [ [ 7, 7, 6, 5 ], [ 4, 5, 3, 3 ], [ 2, 2, 6, 4 ], [ 7, 5, 2, 3 ], 
      [ 1, 6, 2, 4 ], [ 1, 7, 3, 5 ], [ 1, 1, 4, 6 ] ] ];
