[0,1,3,2,7,4,5,15,6,31,8,9,11,10,63,12,13,127,14,
255,16,17,19,18,23,20,21,511,22,1023,24,25,27,26,
2047,28,29,4095,30,8191,32,33,35,34,39,36,37,47,
38,16383,40,41,43,42,32767,44,45,65535,46,131071,
48,49,51,50,55,52,53,262143,54,524287,56,57,59,58,
1048575,60,61]
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