− a 4 z 10 + 2 a 6 z 8 − 7 a 4 z 8 + a 2 z 8 − a 8 z 6 + 11 a 6 z 6 − 19 a 4 z 6 + 5 a 2 z 6 − 4 a 8 z 4 + 22 a 6 z 4 − 23 a 4 z 4 + 8 a 2 z 4 − 6 a 8 z 2 + 18 a 6 z 2 − 10 a 4 z 2 + 4 a 2 z 2 − 3 a 8 + 4 a 6 {\displaystyle -a^{4}z^{10}+2a^{6}z^{8}-7a^{4}z^{8}+a^{2}z^{8}-a^{8}z^{6}+11a^{6}z^{6}-19a^{4}z^{6}+5a^{2}z^{6}-4a^{8}z^{4}+22a^{6}z^{4}-23a^{4}z^{4}+8a^{2}z^{4}-6a^{8}z^{2}+18a^{6}z^{2}-10a^{4}z^{2}+4a^{2}z^{2}-3a^{8}+4a^{6}}