a 4 z 10 + a 2 z 10 − a 6 z 8 + 7 a 4 z 8 + 6 a 2 z 8 − z 8 − 6 a 6 z 6 + 21 a 4 z 6 + 14 a 2 z 6 − 5 z 6 − 14 a 6 z 4 + 32 a 4 z 4 + 15 a 2 z 4 − 10 z 4 − 14 a 6 z 2 + 24 a 4 z 2 + 7 a 2 z 2 − 9 z 2 − 5 a 6 + 7 a 4 + a 2 − 2 {\displaystyle a^{4}z^{10}+a^{2}z^{10}-a^{6}z^{8}+7a^{4}z^{8}+6a^{2}z^{8}-z^{8}-6a^{6}z^{6}+21a^{4}z^{6}+14a^{2}z^{6}-5z^{6}-14a^{6}z^{4}+32a^{4}z^{4}+15a^{2}z^{4}-10z^{4}-14a^{6}z^{2}+24a^{4}z^{2}+7a^{2}z^{2}-9z^{2}-5a^{6}+7a^{4}+a^{2}-2}