z 4 a 12 − 2 z 2 a 12 + 2 z 5 a 11 − 4 z 3 a 11 + z a 11 + 2 z 6 a 10 − 3 z 4 a 10 + z 2 a 10 + 2 z 7 a 9 − 5 z 5 a 9 + 7 z 3 a 9 − 2 z a 9 + z 8 a 8 − 2 z 6 a 8 + 4 z 4 a 8 − 2 z 2 a 8 + 2 a 8 + 3 z 7 a 7 − 10 z 5 a 7 + 16 z 3 a 7 − 8 z a 7 + z 8 a 6 − 4 z 6 a 6 + 11 z 4 a 6 − 14 z 2 a 6 + 6 a 6 + z 7 a 5 − 3 z 5 a 5 + 5 z 3 a 5 − 5 z a 5 + 3 z 4 a 4 − 9 z 2 a 4 + 5 a 4 {\displaystyle z^{4}a^{12}-2z^{2}a^{12}+2z^{5}a^{11}-4z^{3}a^{11}+za^{11}+2z^{6}a^{10}-3z^{4}a^{10}+z^{2}a^{10}+2z^{7}a^{9}-5z^{5}a^{9}+7z^{3}a^{9}-2za^{9}+z^{8}a^{8}-2z^{6}a^{8}+4z^{4}a^{8}-2z^{2}a^{8}+2a^{8}+3z^{7}a^{7}-10z^{5}a^{7}+16z^{3}a^{7}-8za^{7}+z^{8}a^{6}-4z^{6}a^{6}+11z^{4}a^{6}-14z^{2}a^{6}+6a^{6}+z^{7}a^{5}-3z^{5}a^{5}+5z^{3}a^{5}-5za^{5}+3z^{4}a^{4}-9z^{2}a^{4}+5a^{4}}
