a 5 z 9 + a 3 z 9 + 2 a 6 z 8 + 4 a 4 z 8 + 2 a 2 z 8 + a 7 z 7 − a 5 z 7 − a 3 z 7 + a z 7 − 9 a 6 z 6 − 15 a 4 z 6 − 6 a 2 z 6 − 5 a 7 z 5 − 9 a 5 z 5 − 5 a 3 z 5 − a z 5 + 11 a 6 z 4 + 12 a 4 z 4 + 2 a 2 z 4 + z 4 + 8 a 7 z 3 + 13 a 5 z 3 + 2 a 3 z 3 − 3 a z 3 − 4 a 6 z 2 − a 4 z 2 + 5 a 2 z 2 + 2 z 2 − 4 a 7 z − 4 a 5 z + 2 a 3 z + 4 a z + 2 z a − 1 + a 6 − a 4 − 5 a 2 − 2 {\displaystyle a^{5}z^{9}+a^{3}z^{9}+2a^{6}z^{8}+4a^{4}z^{8}+2a^{2}z^{8}+a^{7}z^{7}-a^{5}z^{7}-a^{3}z^{7}+az^{7}-9a^{6}z^{6}-15a^{4}z^{6}-6a^{2}z^{6}-5a^{7}z^{5}-9a^{5}z^{5}-5a^{3}z^{5}-az^{5}+11a^{6}z^{4}+12a^{4}z^{4}+2a^{2}z^{4}+z^{4}+8a^{7}z^{3}+13a^{5}z^{3}+2a^{3}z^{3}-3az^{3}-4a^{6}z^{2}-a^{4}z^{2}+5a^{2}z^{2}+2z^{2}-4a^{7}z-4a^{5}z+2a^{3}z+4az+2za^{-1}+a^{6}-a^{4}-5a^{2}-2}
