− a 4 z 10 + a 6 z 8 − 7 a 4 z 8 + 2 a 2 z 8 + 6 a 6 z 6 − 19 a 4 z 6 + 11 a 2 z 6 − z 6 − a 8 z 4 + 12 a 6 z 4 − 26 a 4 z 4 + 21 a 2 z 4 − 4 z 4 − 2 a 8 z 2 + 10 a 6 z 2 − 18 a 4 z 2 + 18 a 2 z 2 − 5 z 2 − a 8 + 3 a 6 − 6 a 4 + 7 a 2 − 2 {\displaystyle -a^{4}z^{10}+a^{6}z^{8}-7a^{4}z^{8}+2a^{2}z^{8}+6a^{6}z^{6}-19a^{4}z^{6}+11a^{2}z^{6}-z^{6}-a^{8}z^{4}+12a^{6}z^{4}-26a^{4}z^{4}+21a^{2}z^{4}-4z^{4}-2a^{8}z^{2}+10a^{6}z^{2}-18a^{4}z^{2}+18a^{2}z^{2}-5z^{2}-a^{8}+3a^{6}-6a^{4}+7a^{2}-2}
