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