− v 2 u 6 + v u 6 + 3 v 2 u 5 − 4 v u 5 + u 5 − 4 v 2 u 4 + 7 v u 4 − 3 u 4 + 4 v 2 u 3 − 7 v u 3 + 4 u 3 − 3 v 2 u 2 + 7 v u 2 − 4 u 2 + v 2 u − 4 v u + 3 u + v − 1 {\displaystyle -v^{2}u^{6}+vu^{6}+3v^{2}u^{5}-4vu^{5}+u^{5}-4v^{2}u^{4}+7vu^{4}-3u^{4}+4v^{2}u^{3}-7vu^{3}+4u^{3}-3v^{2}u^{2}+7vu^{2}-4u^{2}+v^{2}u-4vu+3u+v-1}
