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