[0,1,1,2,2,3,3,3,4,5,4,4,5,6,7,5,5,6,7,8,9,6,6,7, 8,9,10,11,7,7,8,9,10,11,12,13,8,8,9,10,11,12,13, 14,15,9,9,10,11,12,13,14,15,16,17,10,10,11,12,13, 14,15,16,17,18,19,11,11,12,13,14,15,16]