[0,1,3,2,7,6,15,4,5,14,31,12,63,30,13,8,127,10,
255,28,9,62,511,24,11,126,29,60,1023,26,2047,16,
25,254,27,20,4095,510,61,56,8191,18,16383,124,17,
1022,32767,48,23,22,21,252,65535,58,19,120,57,
2046,131071,52,262143,4094,125,32,59,50,524287,
508,49,54,1048575,40]
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