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 − 11 a 5 z 5 − 5 a 3 z 5 + 11 a 6 z 4 + 12 a 4 z 4 + a 2 z 4 + 10 a 7 z 3 + 16 a 5 z 3 + 6 a 3 z 3 − 8 a 6 z 2 − 12 a 4 z 2 − 4 a 2 z 2 − 4 a 7 z − 6 a 5 z − 2 a 3 z + 2 a 6 + 4 a 4 + 2 a 2 + 1 {\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}-11a^{5}z^{5}-5a^{3}z^{5}+11a^{6}z^{4}+12a^{4}z^{4}+a^{2}z^{4}+10a^{7}z^{3}+16a^{5}z^{3}+6a^{3}z^{3}-8a^{6}z^{2}-12a^{4}z^{2}-4a^{2}z^{2}-4a^{7}z-6a^{5}z-2a^{3}z+2a^{6}+4a^{4}+2a^{2}+1}
