a 13 z 7 − 5 a 13 z 5 + 8 a 13 z 3 − 4 a 13 z + 2 a 12 z 8 − 9 a 12 z 6 + 12 a 12 z 4 − 4 a 12 z 2 + a 11 z 9 − 11 a 11 z 5 + 15 a 11 z 3 − 3 a 11 z + 5 a 10 z 8 − 15 a 10 z 6 + 9 a 10 z 4 + a 10 z 2 + a 9 z 9 + 5 a 9 z 7 − 21 a 9 z 5 + 18 a 9 z 3 − 7 a 9 z + a 9 z − 1 + 3 a 8 z 8 + a 8 z 6 − 15 a 8 z 4 + 8 a 8 z 2 − a 8 + 6 a 7 z 7 − 9 a 7 z 5 + 4 a 7 z 3 − 5 a 7 z + a 7 z − 1 + 7 a 6 z 6 − 9 a 6 z 4 + 3 a 6 z 2 + 6 a 5 z 5 − 6 a 5 z 3 + 3 a 5 z + 3 a 4 z 4 + a 3 z 3 {\displaystyle a^{13}z^{7}-5a^{13}z^{5}+8a^{13}z^{3}-4a^{13}z+2a^{12}z^{8}-9a^{12}z^{6}+12a^{12}z^{4}-4a^{12}z^{2}+a^{11}z^{9}-11a^{11}z^{5}+15a^{11}z^{3}-3a^{11}z+5a^{10}z^{8}-15a^{10}z^{6}+9a^{10}z^{4}+a^{10}z^{2}+a^{9}z^{9}+5a^{9}z^{7}-21a^{9}z^{5}+18a^{9}z^{3}-7a^{9}z+a^{9}z^{-1}+3a^{8}z^{8}+a^{8}z^{6}-15a^{8}z^{4}+8a^{8}z^{2}-a^{8}+6a^{7}z^{7}-9a^{7}z^{5}+4a^{7}z^{3}-5a^{7}z+a^{7}z^{-1}+7a^{6}z^{6}-9a^{6}z^{4}+3a^{6}z^{2}+6a^{5}z^{5}-6a^{5}z^{3}+3a^{5}z+3a^{4}z^{4}+a^{3}z^{3}}
