[0,1,2,3,4,6,5,8,7,10,12,9,14,11,16,18,13,20,15, 22,24,17,26,19,28,30,21,32,23,34,36,25,38,27,40, 42,29,44,31,46,48,33,50,35,52,54,37,56,39,58,60, 41,62,43,64,66,45,68,47,70,72,49,74,51,76,78,53, 80]