0.0 0.0 1.0 2.0 1.0 1.0 -2.0 -1.0 1.0 3.0 4.0 1.0 -3.0 -4.0 1.0 2.0 1.0 1.0 3.0 4.0 1.0 -2.0 -1.0 1.0 -3.0 -4.0 1.0 C P Q s P Q P2 P C Q2 Q C s2 s C