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