− z 4 a 14 − 2 z 2 a 14 − a 14 + z 6 a 12 + 3 z 4 a 12 + 4 z 2 a 12 + 3 a 12 − 4 z 4 a 10 − 11 z 2 a 10 − 7 a 10 + z 8 a 8 + 8 z 6 a 8 + 20 z 4 a 8 + 19 z 2 a 8 + 6 a 8 {\displaystyle -z^{4}a^{14}-2z^{2}a^{14}-a^{14}+z^{6}a^{12}+3z^{4}a^{12}+4z^{2}a^{12}+3a^{12}-4z^{4}a^{10}-11z^{2}a^{10}-7a^{10}+z^{8}a^{8}+8z^{6}a^{8}+20z^{4}a^{8}+19z^{2}a^{8}+6a^{8}}