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