[1,2,1,3,4,2,5,6,7,3,8,9,4,10,11,12,5,13,14,6,15, 16,7,17,18,19,8,20,21,9,22,23,24,10,25,26,11,27, 28,12,29,30,31,13,32,33,14,34,35,36,15,37,38,16, 39,40,41,17,42,43,18,44,45,19,46,47,48]