z 4 a 16 − z 2 a 16 + 3 z 5 a 15 − 4 z 3 a 15 + z a 15 + 4 z 6 a 14 − 4 z 4 a 14 + 4 z 7 a 13 − 4 z 5 a 13 + z 3 a 13 + 3 z 8 a 12 − 3 z 6 a 12 + 2 z 4 a 12 − 2 z 2 a 12 + 2 a 12 + z 9 a 11 + 5 z 7 a 11 − 19 z 5 a 11 + 24 z 3 a 11 − 10 z a 11 + 6 z 8 a 10 − 19 z 6 a 10 + 26 z 4 a 10 − 20 z 2 a 10 + 7 a 10 + z 9 a 9 + 3 z 7 a 9 − 18 z 5 a 9 + 22 z 3 a 9 − 9 z a 9 + 3 z 8 a 8 − 11 z 6 a 8 + 15 z 4 a 8 − 13 z 2 a 8 + 5 a 8 + 2 z 7 a 7 − 6 z 5 a 7 + 3 z 3 a 7 + z 6 a 6 − 4 z 4 a 6 + 4 z 2 a 6 − a 6 {\displaystyle z^{4}a^{16}-z^{2}a^{16}+3z^{5}a^{15}-4z^{3}a^{15}+za^{15}+4z^{6}a^{14}-4z^{4}a^{14}+4z^{7}a^{13}-4z^{5}a^{13}+z^{3}a^{13}+3z^{8}a^{12}-3z^{6}a^{12}+2z^{4}a^{12}-2z^{2}a^{12}+2a^{12}+z^{9}a^{11}+5z^{7}a^{11}-19z^{5}a^{11}+24z^{3}a^{11}-10za^{11}+6z^{8}a^{10}-19z^{6}a^{10}+26z^{4}a^{10}-20z^{2}a^{10}+7a^{10}+z^{9}a^{9}+3z^{7}a^{9}-18z^{5}a^{9}+22z^{3}a^{9}-9za^{9}+3z^{8}a^{8}-11z^{6}a^{8}+15z^{4}a^{8}-13z^{2}a^{8}+5a^{8}+2z^{7}a^{7}-6z^{5}a^{7}+3z^{3}a^{7}+z^{6}a^{6}-4z^{4}a^{6}+4z^{2}a^{6}-a^{6}}
