[1,2,1,3,4,2,5,6,7,8,3,9,10,4,11,12,13,14,5,15,16, 6,17,18,7,19,20,8,21,22,23,24,9,25,26,10,27,28,29, 30,11,31,32,12,33,34,13,35,36,14,37,38,39,40,15, 41,42,16,43,44,45,46,17,47,48,18,49]