[2,1,2,3,2,3,4,5,3,5,6,7,5,6,7,8,6,7,9,10,7,9,10, 11,8,10,11,13,10,11,13,14,11,13,14,15,12,14,15,17, 13,15,17,18,14,16,18,19,15,17,19,21,17,19,20,22, 18,20,22,23,19,21,23,24,20,22,24,26,21,23,25,27, 22,25,26,28]