[0,1,0,1,2,2,1,3,2,3,4,3,4,5,3,4,6,5,4,7,6,6,8,6, 6,9,8,7,10,8,7,11,8,10,12,9,10,13,9,10,14,11,12, 15,12,12,16,14,12,17,12,13,18,15,16,19,14,15,20, 15,16,21,15,16,22,17,16,23,20]