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