return 
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      [ 19, 19, 15, 13 ], [ 2, 2, 7, 3 ], [ 9, 9, 4, 3 ], [ 16, 16, 12, 11 ] ]
    , 
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      [ 10, 14, 16, 11 ], [ 11, 15, 13, 12 ], [ 2, 2, 7, 3 ], [ 9, 9, 4, 3 ], 
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      [ 18, 18, 12, 13 ] ], 
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      [ 12, 15, 14, 13 ], [ 1, 1, 2, 3 ], [ 8, 8, 14, 4 ], [ 11, 11, 15, 12 ] 
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      [ 13, 14, 17, 18 ], [ 14, 13, 18, 17 ], [ 15, 16, 18, 18 ], 
      [ 16, 15, 17, 17 ], [ 1, 1, 2, 2 ] ] ];
