v 3 u 4 − 2 v 2 u 4 + v u 4 − 4 v 3 u 3 + 7 v 2 u 3 − 4 v u 3 + u 3 − v 4 u 2 + 6 v 3 u 2 − 9 v 2 u 2 + 6 v u 2 − u 2 + v 4 u − 4 v 3 u + 7 v 2 u − 4 v u + v 3 − 2 v 2 + v {\displaystyle v^{3}u^{4}-2v^{2}u^{4}+vu^{4}-4v^{3}u^{3}+7v^{2}u^{3}-4vu^{3}+u^{3}-v^{4}u^{2}+6v^{3}u^{2}-9v^{2}u^{2}+6vu^{2}-u^{2}+v^{4}u-4v^{3}u+7v^{2}u-4vu+v^{3}-2v^{2}+v}
