4 4 4 4 3 3 3 3 3 3 3 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 . 5 5 5 3 3 3 3 2.5 2.5 2.5 2.5 0.5 0.5 0.5 0.5 0 0 0 1 1 1 2 2 2 1