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