z 2 a 12 + 2 a 12 − 3 z 4 a 10 − 10 z 2 a 10 − 7 a 10 + 2 z 6 a 8 + 9 z 4 a 8 + 12 z 2 a 8 + 5 a 8 + z 6 a 6 + 4 z 4 a 6 + 4 z 2 a 6 + a 6 {\displaystyle z^{2}a^{12}+2a^{12}-3z^{4}a^{10}-10z^{2}a^{10}-7a^{10}+2z^{6}a^{8}+9z^{4}a^{8}+12z^{2}a^{8}+5a^{8}+z^{6}a^{6}+4z^{4}a^{6}+4z^{2}a^{6}+a^{6}}
