[1,2,4,7,3,5,8,6,9,10,11,12,13,14,16,19,15,17,20, 22,18,21,23,24,25,26,28,31,27,29,32,34,37,30,33, 36,35,38,40,39,41,44,42,43,46,49,45,47,48,51,50, 52,53,54,57,56,55,58,61,59,62,60,64,65,68,63,66, 67,71,69,70,73,72]