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