8 8 7 7 7 7 6 6 6 6 6 5 5 5 5 5 5 5 4 4 4 4 3 3 3 3 3 3 3 2 2 2 2 2 2 1 1 1 1 1 1 1 1 5 4 2 2 2 2 2 1 1 1 9 8 3.5 4 3 4 2 1 1-2 1-2 2-3 2-3 2-3 2-3 2-3 3-4 4-5 5-6 6-7 7-8 6-7