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 + 9 z 4 a 14 − 2 z 2 a 14 + 5 z 9 a 13 − 15 z 7 a 13 + 13 z 5 a 13 − 6 z 3 a 13 + 2 z a 13 + 5 z 10 a 12 − 11 z 8 a 12 + 5 z 6 a 12 − 4 z 4 a 12 + 4 z 2 a 12 − a 12 + 3 z 11 a 11 − 13 z 7 a 11 + 12 z 5 a 11 − 6 z 3 a 11 + z a 11 + z 12 a 10 + 6 z 10 a 10 − 14 z 8 a 10 + 4 z 6 a 10 + 7 z 4 a 10 − 6 z 2 a 10 + a 10 + 6 z 11 a 9 − 10 z 9 a 9 + 10 z 7 a 9 − 12 z 5 a 9 + 11 z 3 a 9 − 3 z a 9 + z 12 a 8 + 6 z 10 a 8 − 11 z 8 a 8 + 21 z 4 a 8 − 17 z 2 a 8 + 4 a 8 + 3 z 11 a 7 + z 9 a 7 − 9 z 7 a 7 + 14 z 5 a 7 − 7 z 3 a 7 + z a 7 + 5 z 10 a 6 − 6 z 8 a 6 − 2 z 6 a 6 + 14 z 4 a 6 − 13 z 2 a 6 + 3 a 6 + 6 z 9 a 5 − 13 z 7 a 5 + 13 z 5 a 5 − 8 z 3 a 5 + z a 5 + 5 z 8 a 4 − 12 z 6 a 4 + 10 z 4 a 4 − 6 z 2 a 4 + 2 a 4 + 3 z 7 a 3 − 8 z 5 a 3 + 5 z 3 a 3 + z 6 a 2 − 3 z 4 a 2 + 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}+9z^{4}a^{14}-2z^{2}a^{14}+5z^{9}a^{13}-15z^{7}a^{13}+13z^{5}a^{13}-6z^{3}a^{13}+2za^{13}+5z^{10}a^{12}-11z^{8}a^{12}+5z^{6}a^{12}-4z^{4}a^{12}+4z^{2}a^{12}-a^{12}+3z^{11}a^{11}-13z^{7}a^{11}+12z^{5}a^{11}-6z^{3}a^{11}+za^{11}+z^{12}a^{10}+6z^{10}a^{10}-14z^{8}a^{10}+4z^{6}a^{10}+7z^{4}a^{10}-6z^{2}a^{10}+a^{10}+6z^{11}a^{9}-10z^{9}a^{9}+10z^{7}a^{9}-12z^{5}a^{9}+11z^{3}a^{9}-3za^{9}+z^{12}a^{8}+6z^{10}a^{8}-11z^{8}a^{8}+21z^{4}a^{8}-17z^{2}a^{8}+4a^{8}+3z^{11}a^{7}+z^{9}a^{7}-9z^{7}a^{7}+14z^{5}a^{7}-7z^{3}a^{7}+za^{7}+5z^{10}a^{6}-6z^{8}a^{6}-2z^{6}a^{6}+14z^{4}a^{6}-13z^{2}a^{6}+3a^{6}+6z^{9}a^{5}-13z^{7}a^{5}+13z^{5}a^{5}-8z^{3}a^{5}+za^{5}+5z^{8}a^{4}-12z^{6}a^{4}+10z^{4}a^{4}-6z^{2}a^{4}+2a^{4}+3z^{7}a^{3}-8z^{5}a^{3}+5z^{3}a^{3}+z^{6}a^{2}-3z^{4}a^{2}+2z^{2}a^{2}}