− z 2 a 12 − 2 a 12 + 4 z 4 a 10 + 10 z 2 a 10 + 5 a 10 − 5 z 6 a 8 − 16 z 4 a 8 − 16 z 2 a 8 − 7 a 8 + 2 z 8 a 6 + 7 z 6 a 6 + 11 z 4 a 6 + 12 z 2 a 6 + 5 a 6 + z 8 a 4 + 2 z 6 a 4 + z 4 a 4 + 2 z 2 a 4 − z 6 a 2 − 2 z 4 a 2 {\displaystyle -z^{2}a^{12}-2a^{12}+4z^{4}a^{10}+10z^{2}a^{10}+5a^{10}-5z^{6}a^{8}-16z^{4}a^{8}-16z^{2}a^{8}-7a^{8}+2z^{8}a^{6}+7z^{6}a^{6}+11z^{4}a^{6}+12z^{2}a^{6}+5a^{6}+z^{8}a^{4}+2z^{6}a^{4}+z^{4}a^{4}+2z^{2}a^{4}-z^{6}a^{2}-2z^{4}a^{2}}
