0.0 0.0 4.0 0.0 6.0 0.0 10.0 0.0 12.0 0.0 18.0 0.0 20.0 0.0 0.0 2.0 4.0 2.0 6.0 2.0 10.0 2.0 12.0 2.0 18.0 2.0 20.0 2.0 0.0 10.0 4.0 10.0 6.0 10.0 10.0 10.0 12.0 10.0 18.0 10.0 20.0 10.0 0.0 12.0 4.0 12.0 6.0 12.0 10.0 12.0 12.0 12.0 18.0 12.0 20.0 12.0