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