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