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