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