7 6 6 5 5 5 5 5 4 4 4 4 4 4 5 5 4 4 4 3 3 3 3 3 3 3 3 3 4 3 3 2 2 2 2 1 1 1 1 1 1 2 2 2 2 2 2 2 1 1 1 1 3 3 2 2 1 1 1 2 3.5 3 4 4.5 5.5 5.5 4 8 6 4 4 . 1-2 1-2 1-2 2-3 2-3 2-3 2-3 2-3 3-4 3-4 3-4 3-4 4-5 3-4 1-2