. 2 2 1 1 2 1.5 3 3 4 5 2 2.5 1 1 2 3 3.5 3 3 3 3 3.5 2 2 2 2 1 1 4 4 3 4 4 5 5 6 6.5 7 8 8.5 7 6 7 8 9 3 . . .