[9,8,7,6,5,4,3,2,1,0,1,2,3,4,5,6,7,8,9,8,7,6,5,4, 3,2,1,0,1,2,3,4,5,6,7,8,9,8,7,6,5,4,3,2,1,0,1,2,3, 4,5,6,7,8,9,8,7,6,5,4,3,2,1,0,1,2,3,4,5,6,7,8,9,8, 7,6,5,4,3,2,1,0,1,2,3,4,5]