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