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