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