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