− z 4 a 12 − 3 z 2 a 12 − 2 a 12 + 3 z 6 a 10 + 12 z 4 a 10 + 14 z 2 a 10 + 5 a 10 − 2 z 8 a 8 − 11 z 6 a 8 − 22 z 4 a 8 − 20 z 2 a 8 − 7 a 8 + 3 z 6 a 6 + 13 z 4 a 6 + 16 z 2 a 6 + 5 a 6 {\displaystyle -z^{4}a^{12}-3z^{2}a^{12}-2a^{12}+3z^{6}a^{10}+12z^{4}a^{10}+14z^{2}a^{10}+5a^{10}-2z^{8}a^{8}-11z^{6}a^{8}-22z^{4}a^{8}-20z^{2}a^{8}-7a^{8}+3z^{6}a^{6}+13z^{4}a^{6}+16z^{2}a^{6}+5a^{6}}
