8 7 7 6 6 5 5 5 5 4 4 4 4 4 4 3 3 3 3 3 3 3 2 2 2 2 2 1 2 2 2 4 1 1 2 2 2 1 4.5 8.5 1 4.5 2 1-2 1-2 2-3 2-3 2-3 2-3 2-3 3-4 3-4 4-5