z a 13 + z 2 a 12 − z a 11 + z 6 a 10 − 5 z 4 a 10 + z 2 a 10 + 2 z 9 a 9 − 11 z 7 a 9 + 16 z 5 a 9 − 11 z 3 a 9 + 2 z a 9 + 4 z 10 a 8 − 26 z 8 a 8 + 55 z 6 a 8 − 53 z 4 a 8 + 22 z 2 a 8 − 3 a 8 + 2 z 11 a 7 − 9 z 9 a 7 + 3 z 7 a 7 + 19 z 5 a 7 − 19 z 3 a 7 + 6 z a 7 + 7 z 10 a 6 − 46 z 8 a 6 + 97 z 6 a 6 − 83 z 4 a 6 + 31 z 2 a 6 − 4 a 6 + 2 z 11 a 5 − 10 z 9 a 5 + 8 z 7 a 5 + 14 z 5 a 5 − 15 z 3 a 5 + 3 z a 5 + 3 z 10 a 4 − 20 z 8 a 4 + 43 z 6 a 4 − 35 z 4 a 4 + 9 z 2 a 4 + z 9 a 3 − 6 z 7 a 3 + 11 z 5 a 3 − 7 z 3 a 3 + z a 3 {\displaystyle za^{13}+z^{2}a^{12}-za^{11}+z^{6}a^{10}-5z^{4}a^{10}+z^{2}a^{10}+2z^{9}a^{9}-11z^{7}a^{9}+16z^{5}a^{9}-11z^{3}a^{9}+2za^{9}+4z^{10}a^{8}-26z^{8}a^{8}+55z^{6}a^{8}-53z^{4}a^{8}+22z^{2}a^{8}-3a^{8}+2z^{11}a^{7}-9z^{9}a^{7}+3z^{7}a^{7}+19z^{5}a^{7}-19z^{3}a^{7}+6za^{7}+7z^{10}a^{6}-46z^{8}a^{6}+97z^{6}a^{6}-83z^{4}a^{6}+31z^{2}a^{6}-4a^{6}+2z^{11}a^{5}-10z^{9}a^{5}+8z^{7}a^{5}+14z^{5}a^{5}-15z^{3}a^{5}+3za^{5}+3z^{10}a^{4}-20z^{8}a^{4}+43z^{6}a^{4}-35z^{4}a^{4}+9z^{2}a^{4}+z^{9}a^{3}-6z^{7}a^{3}+11z^{5}a^{3}-7z^{3}a^{3}+za^{3}}