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 + 19 a 4 z 6 + 12 a 2 z 6 − 5 z 6 − 12 a 6 z 4 + 25 a 4 z 4 + 8 a 2 z 4 − 8 z 4 − 9 a 6 z 2 + 17 a 4 z 2 − 4 z 2 − 3 a 6 + 5 a 4 − a 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}+19a^{4}z^{6}+12a^{2}z^{6}-5z^{6}-12a^{6}z^{4}+25a^{4}z^{4}+8a^{2}z^{4}-8z^{4}-9a^{6}z^{2}+17a^{4}z^{2}-4z^{2}-3a^{6}+5a^{4}-a^{2}}