[1,2,4,3,6,8,5,9,11,7,12,10,15,13,14,16,17,19,18, 22,21,24,20,23,25,26,28,27,30,32,29,31,34,36,33, 35,38,40,39,37,41,42,44,43,45,46,48,49,47,50,52, 51,54,56,53,55,58,60,61,57,63,59,62,64,65,67,66, 70,71,68,72,69]