. 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 5 . . . 3.5 6 1.5 1.5 2.5 1.5 0.5 0.5 3.5 0.5 1 - 2 1 - 2 1 - 2 1 - 2 2 - 3 2 - 3 2 - 3