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