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