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