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