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