a 4 z 10 + a 2 z 10 + 2 a 5 z 9 + 4 a 3 z 9 + 2 a z 9 + 2 a 6 z 8 − a 4 z 8 − 2 a 2 z 8 + z 8 + a 7 z 7 − 7 a 5 z 7 − 18 a 3 z 7 − 10 a z 7 − 9 a 6 z 6 − 10 a 4 z 6 − 6 a 2 z 6 − 5 z 6 − 5 a 7 z 5 + 2 a 5 z 5 + 23 a 3 z 5 + 16 a z 5 + 11 a 6 z 4 + 17 a 4 z 4 + 15 a 2 z 4 + 9 z 4 + 7 a 7 z 3 + 5 a 5 z 3 − 11 a 3 z 3 − 8 a z 3 + z 3 a − 1 − 6 a 6 z 2 − 12 a 4 z 2 − 10 a 2 z 2 − 4 z 2 − 3 a 7 z − 3 a 5 z + a 3 z + a z + 2 a 6 + 4 a 4 + 2 a 2 + 1 {\displaystyle a^{4}z^{10}+a^{2}z^{10}+2a^{5}z^{9}+4a^{3}z^{9}+2az^{9}+2a^{6}z^{8}-a^{4}z^{8}-2a^{2}z^{8}+z^{8}+a^{7}z^{7}-7a^{5}z^{7}-18a^{3}z^{7}-10az^{7}-9a^{6}z^{6}-10a^{4}z^{6}-6a^{2}z^{6}-5z^{6}-5a^{7}z^{5}+2a^{5}z^{5}+23a^{3}z^{5}+16az^{5}+11a^{6}z^{4}+17a^{4}z^{4}+15a^{2}z^{4}+9z^{4}+7a^{7}z^{3}+5a^{5}z^{3}-11a^{3}z^{3}-8az^{3}+z^{3}a^{-1}-6a^{6}z^{2}-12a^{4}z^{2}-10a^{2}z^{2}-4z^{2}-3a^{7}z-3a^{5}z+a^{3}z+az+2a^{6}+4a^{4}+2a^{2}+1}
