[1,2,2,3,3,4,4,2,3,5,5,6,6,4,3,7,7,8,8,4,5,9,9,3, 6,6,4,10,10,11,11,5,7,7,4,12,12,8,6,13,13,14,14,5, 9,15,15,4,4,7,7,16,16,5,5,8,10,17,17,18,18,11,4,6, 6,19,19,9,9,20,20,21,21,12,8,8,6]