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