z 7 a 15 − 4 z 5 a 15 + 5 z 3 a 15 − 2 z a 15 + 3 z 8 a 14 − 10 z 6 a 14 + 10 z 4 a 14 − 3 z 2 a 14 + 5 z 9 a 13 − 14 z 7 a 13 + 12 z 5 a 13 − 5 z 3 a 13 + 2 z a 13 + 5 z 10 a 12 − 8 z 8 a 12 − z 6 a 12 + 2 z 4 a 12 + 2 z 2 a 12 − a 12 + 3 z 11 a 11 + 5 z 9 a 11 − 26 z 7 a 11 + 29 z 5 a 11 − 16 z 3 a 11 + 3 z a 11 + z 12 a 10 + 10 z 10 a 10 − 20 z 8 a 10 + 7 z 6 a 10 + 5 z 4 a 10 − 4 z 2 a 10 + 7 z 11 a 9 − 23 z 7 a 9 + 27 z 5 a 9 − 11 z 3 a 9 + z a 9 + z 12 a 8 + 13 z 10 a 8 − 21 z 8 a 8 + 18 z 4 a 8 − 9 z 2 a 8 + a 8 + 4 z 11 a 7 + 10 z 9 a 7 − 33 z 7 a 7 + 32 z 5 a 7 − 14 z 3 a 7 + 3 z a 7 + 8 z 10 a 6 − 4 z 8 a 6 − 15 z 6 a 6 + 18 z 4 a 6 − 6 z 2 a 6 + 10 z 9 a 5 − 17 z 7 a 5 + 10 z 5 a 5 − 5 z 3 a 5 + z a 5 + 8 z 8 a 4 − 16 z 6 a 4 + 11 z 4 a 4 − 5 z 2 a 4 + a 4 + 4 z 7 a 3 − 8 z 5 a 3 + 4 z 3 a 3 + z 6 a 2 − 2 z 4 a 2 + z 2 a 2 {\displaystyle z^{7}a^{15}-4z^{5}a^{15}+5z^{3}a^{15}-2za^{15}+3z^{8}a^{14}-10z^{6}a^{14}+10z^{4}a^{14}-3z^{2}a^{14}+5z^{9}a^{13}-14z^{7}a^{13}+12z^{5}a^{13}-5z^{3}a^{13}+2za^{13}+5z^{10}a^{12}-8z^{8}a^{12}-z^{6}a^{12}+2z^{4}a^{12}+2z^{2}a^{12}-a^{12}+3z^{11}a^{11}+5z^{9}a^{11}-26z^{7}a^{11}+29z^{5}a^{11}-16z^{3}a^{11}+3za^{11}+z^{12}a^{10}+10z^{10}a^{10}-20z^{8}a^{10}+7z^{6}a^{10}+5z^{4}a^{10}-4z^{2}a^{10}+7z^{11}a^{9}-23z^{7}a^{9}+27z^{5}a^{9}-11z^{3}a^{9}+za^{9}+z^{12}a^{8}+13z^{10}a^{8}-21z^{8}a^{8}+18z^{4}a^{8}-9z^{2}a^{8}+a^{8}+4z^{11}a^{7}+10z^{9}a^{7}-33z^{7}a^{7}+32z^{5}a^{7}-14z^{3}a^{7}+3za^{7}+8z^{10}a^{6}-4z^{8}a^{6}-15z^{6}a^{6}+18z^{4}a^{6}-6z^{2}a^{6}+10z^{9}a^{5}-17z^{7}a^{5}+10z^{5}a^{5}-5z^{3}a^{5}+za^{5}+8z^{8}a^{4}-16z^{6}a^{4}+11z^{4}a^{4}-5z^{2}a^{4}+a^{4}+4z^{7}a^{3}-8z^{5}a^{3}+4z^{3}a^{3}+z^{6}a^{2}-2z^{4}a^{2}+z^{2}a^{2}}