u 2 v 4 − 3 u 2 v 3 + 3 u 2 v 2 − u 2 v − u v 4 + 4 u v 3 − 7 u v 2 + 4 u v − u − v 3 + 3 v 2 − 3 v + 1 u v 2 {\displaystyle {\frac {u^{2}v^{4}-3u^{2}v^{3}+3u^{2}v^{2}-u^{2}v-uv^{4}+4uv^{3}-7uv^{2}+4uv-u-v^{3}+3v^{2}-3v+1}{uv^{2}}}}
