[1,2,1,3,1,2,4,1,3,2,5,1,4,2,3,6,1,5,2,4,3,7,1,6, 2,5,3,4,8,1,7,2,6,3,5,4,9,1,8,2,7,3,6,4,5,10,1,9, 2,8,3,7,4,6,5,11,1,10,2,9,3,8,4,7,5,6,12,1,11,2, 10,3,9,4,8,5,7,6,13,1,12,2,11,3,10]