a 4 z 10 + a 2 z 10 − a 6 z 8 + 8 a 4 z 8 + 7 a 2 z 8 − z 8 − 7 a 6 z 6 + 26 a 4 z 6 + 18 a 2 z 6 − 6 z 6 − 18 a 6 z 4 + 43 a 4 z 4 + 19 a 2 z 4 − 13 z 4 − 20 a 6 z 2 + 37 a 4 z 2 + 5 a 2 z 2 − 11 z 2 − 8 a 6 + 13 a 4 − 2 a 2 − 2 {\displaystyle a^{4}z^{10}+a^{2}z^{10}-a^{6}z^{8}+8a^{4}z^{8}+7a^{2}z^{8}-z^{8}-7a^{6}z^{6}+26a^{4}z^{6}+18a^{2}z^{6}-6z^{6}-18a^{6}z^{4}+43a^{4}z^{4}+19a^{2}z^{4}-13z^{4}-20a^{6}z^{2}+37a^{4}z^{2}+5a^{2}z^{2}-11z^{2}-8a^{6}+13a^{4}-2a^{2}-2}
