[1,2,2,3,2,3,4,2,3,5,4,2,3,5,6,4,2,7,3,5,6,4,8,2, 7,9,3,5,6,4,10,8,2,7,9,3,5,11,6,4,12,10,8,2,7,9,3, 13,5,11,6,4,14,12,10,15,8,2,7,9,16,3,13,5,11,6,4, 17,14,12,10,15,8,2,18,7,9,19,16,3]