[0,1,0,2,1,0,3,2,1,0,4,3,2,1,0,5,4,3,2,1,0,6,5,4,
3,2,1,0,7,6,5,4,3,2,1,0,8,7,6,5,4,3,2,1,0,11,12,
13,14,15,16,17,18,19,0,10,11,12,13,14,15,16,17,18,
1,0,11,10,11,12,13,14,15,16,17,2,1,0,12,11,10,11,
12,13,14,15,16,3,2,1,0,13,12,11,10,11,12,13,14,15,
4,3,2,1,0]
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