a 6 z 8 + a 4 z 8 + a 7 z 7 + 2 a 5 z 7 + a 3 z 7 − 6 a 6 z 6 − 6 a 4 z 6 − 6 a 7 z 5 − 12 a 5 z 5 − 6 a 3 z 5 + 10 a 6 z 4 + 10 a 4 z 4 + 10 a 7 z 3 + 19 a 5 z 3 + 9 a 3 z 3 − 6 a 6 z 2 − 7 a 4 z 2 − a 2 z 2 − 5 a 7 z − 8 a 5 z − 4 a 3 z − a z + 2 a 6 + 3 a 4 {\displaystyle a^{6}z^{8}+a^{4}z^{8}+a^{7}z^{7}+2a^{5}z^{7}+a^{3}z^{7}-6a^{6}z^{6}-6a^{4}z^{6}-6a^{7}z^{5}-12a^{5}z^{5}-6a^{3}z^{5}+10a^{6}z^{4}+10a^{4}z^{4}+10a^{7}z^{3}+19a^{5}z^{3}+9a^{3}z^{3}-6a^{6}z^{2}-7a^{4}z^{2}-a^{2}z^{2}-5a^{7}z-8a^{5}z-4a^{3}z-az+2a^{6}+3a^{4}}
