[1,2,4,3,5,7,6,8,10,9,11,13,12,14,16,15,17,19,18, 20,22,21,23,25,24,26,28,27,29,31,30,32,34,33,35, 37,36,38,40,39,41,43,42,44,46,45,47,49,48,50,52, 51,53,55,54,56,58,57,59,61,60,62,64,63,65,67,66]