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