− a 4 z 10 + 2 a 6 z 8 − 7 a 4 z 8 + 2 a 2 z 8 − a 8 z 6 + 12 a 6 z 6 − 21 a 4 z 6 + 11 a 2 z 6 − z 6 − 5 a 8 z 4 + 27 a 6 z 4 − 35 a 4 z 4 + 22 a 2 z 4 − 4 z 4 − 8 a 8 z 2 + 29 a 6 z 2 − 31 a 4 z 2 + 21 a 2 z 2 − 5 z 2 − 5 a 8 + 12 a 6 − 12 a 4 + 8 a 2 − 2 {\displaystyle -a^{4}z^{10}+2a^{6}z^{8}-7a^{4}z^{8}+2a^{2}z^{8}-a^{8}z^{6}+12a^{6}z^{6}-21a^{4}z^{6}+11a^{2}z^{6}-z^{6}-5a^{8}z^{4}+27a^{6}z^{4}-35a^{4}z^{4}+22a^{2}z^{4}-4z^{4}-8a^{8}z^{2}+29a^{6}z^{2}-31a^{4}z^{2}+21a^{2}z^{2}-5z^{2}-5a^{8}+12a^{6}-12a^{4}+8a^{2}-2}