[0,1,0,2,1,0,3,2,1,4,3,2,5,4,3,0,6,5,4,1,7,6,5,2, 0,8,7,6,3,1,9,8,7,4,2,10,9,8,5,3,11,10,9,6,4,12, 11,10,7,5,0,13,12,11,8,6,1,14,13,12,9,7,2,15,14, 13,10,8,3,0,16,15,14,11,9,4,1,17,16]