[1,3,4,2,5,6,8,9,7,10,20,12,11,13,14,15,16,18,17, 19,30,22,21,31,24,23,26,32,25,33,27,28,34,35,29, 36,38,37,39,50,40,51,41,42,52,44,53,43,45,54,46, 55,47,48,49,56,57,58,59,60,62,61,63,70,64,65,66, 72,67,71,68,73,69,74,75,76,78,80,77,79,81]