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