a 4 z 10 + a 2 z 10 + 3 a 5 z 9 + 5 a 3 z 9 + 2 a z 9 + 3 a 6 z 8 + 3 a 4 z 8 + a 2 z 8 + z 8 + a 7 z 7 − 9 a 5 z 7 − 17 a 3 z 7 − 7 a z 7 − 12 a 6 z 6 − 23 a 4 z 6 − 15 a 2 z 6 − 4 z 6 − 4 a 7 z 5 + a 5 z 5 + 12 a 3 z 5 + 7 a z 5 + 13 a 6 z 4 + 26 a 4 z 4 + 21 a 2 z 4 + 8 z 4 + 5 a 7 z 3 + 6 a 5 z 3 − a 3 z 3 + 2 z 3 a − 1 − 5 a 6 z 2 − 10 a 4 z 2 − 8 a 2 z 2 − 3 z 2 − 2 a 7 z − 2 a 5 z + a 6 + a 4 − a 2 {\displaystyle a^{4}z^{10}+a^{2}z^{10}+3a^{5}z^{9}+5a^{3}z^{9}+2az^{9}+3a^{6}z^{8}+3a^{4}z^{8}+a^{2}z^{8}+z^{8}+a^{7}z^{7}-9a^{5}z^{7}-17a^{3}z^{7}-7az^{7}-12a^{6}z^{6}-23a^{4}z^{6}-15a^{2}z^{6}-4z^{6}-4a^{7}z^{5}+a^{5}z^{5}+12a^{3}z^{5}+7az^{5}+13a^{6}z^{4}+26a^{4}z^{4}+21a^{2}z^{4}+8z^{4}+5a^{7}z^{3}+6a^{5}z^{3}-a^{3}z^{3}+2z^{3}a^{-1}-5a^{6}z^{2}-10a^{4}z^{2}-8a^{2}z^{2}-3z^{2}-2a^{7}z-2a^{5}z+a^{6}+a^{4}-a^{2}}
