− z 2 a 14 − 4 z 2 a 12 − 3 a 12 + z 6 a 10 + 6 z 4 a 10 + 6 z 2 a 10 + 2 a 10 + 2 z 6 a 8 + 10 z 4 a 8 + 10 z 2 a 8 + 2 a 8 + z 6 a 6 + 4 z 4 a 6 + 2 z 2 a 6 {\displaystyle -z^{2}a^{14}-4z^{2}a^{12}-3a^{12}+z^{6}a^{10}+6z^{4}a^{10}+6z^{2}a^{10}+2a^{10}+2z^{6}a^{8}+10z^{4}a^{8}+10z^{2}a^{8}+2a^{8}+z^{6}a^{6}+4z^{4}a^{6}+2z^{2}a^{6}}
