0 0 0 0 5 0 0 10 0 5 10 0 10 10 0 10 5 0 10 0 0 5 0 0 2.5 2.5 5 2.5 7.5 5 5 2.5 0 5 7.5 0 7.5 2.5 -3 7.5 7.5 -3