8 1 50 0 50 50 0 50 1 1 25 0 25 25 0 25 1 1 12 0 12 12 0 12 1 1 6 0 6 6 0 6 1 7 -0.5 -0.5 -0.5 0.5 0.5 -0.5 0.5 0.5 0 0 6 6 5.9 5.9