. 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 3 3 3 3 3 3 3 3 4 4 4 4 4 . . . 2.5 2.5 4.5 4.5 3.5 0.5 0.5 0.5 1.5 2.5 2.5 0.5 2.5 1 - 2 1 - 2 1 - 2 1 - 2