[1,3,2,5,6,4,8,10,9,7,12,14,15,13,11,17,19,21,20, 18,16,23,25,28,27,26,24,22,30,32,35,36,34,33,31, 29,38,40,43,45,44,42,41,39,37,47,49,52,54,55,53, 51,50,48,46,57,59,62,64,66,65,63,61,60,58,56,68, 70,73]