z 7 a 15 − 4 z 5 a 15 + 4 z 3 a 15 − z a 15 + 3 z 8 a 14 − 11 z 6 a 14 + 10 z 4 a 14 − 3 z 2 a 14 + 5 z 9 a 13 − 17 z 7 a 13 + 15 z 5 a 13 − 7 z 3 a 13 + 2 z a 13 + 6 z 10 a 12 − 20 z 8 a 12 + 21 z 6 a 12 − 14 z 4 a 12 + 5 z 2 a 12 − a 12 + 5 z 11 a 11 − 14 z 9 a 11 + 9 z 7 a 11 + 5 z 5 a 11 − 9 z 3 a 11 + 2 z a 11 + 2 z 12 a 10 + 4 z 10 a 10 − 37 z 8 a 10 + 73 z 6 a 10 − 55 z 4 a 10 + 16 z 2 a 10 − 2 a 10 + 11 z 11 a 9 − 42 z 9 a 9 + 65 z 7 a 9 − 37 z 5 a 9 + 8 z 3 a 9 + z a 9 + 2 z 12 a 8 + 6 z 10 a 8 − 40 z 8 a 8 + 78 z 6 a 8 − 57 z 4 a 8 + 21 z 2 a 8 − 4 a 8 + 6 z 11 a 7 − 15 z 9 a 7 + 19 z 7 a 7 − 10 z 5 a 7 + 2 z 3 a 7 + 2 z a 7 + 8 z 10 a 6 − 19 z 8 a 6 + 21 z 6 a 6 − 18 z 4 a 6 + 11 z 2 a 6 − 4 a 6 + 8 z 9 a 5 − 15 z 7 a 5 + 4 z 5 a 5 + 7 z 8 a 4 − 15 z 6 a 4 + 6 z 4 a 4 − z 2 a 4 + 4 z 7 a 3 − 9 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}+4z^{3}a^{15}-za^{15}+3z^{8}a^{14}-11z^{6}a^{14}+10z^{4}a^{14}-3z^{2}a^{14}+5z^{9}a^{13}-17z^{7}a^{13}+15z^{5}a^{13}-7z^{3}a^{13}+2za^{13}+6z^{10}a^{12}-20z^{8}a^{12}+21z^{6}a^{12}-14z^{4}a^{12}+5z^{2}a^{12}-a^{12}+5z^{11}a^{11}-14z^{9}a^{11}+9z^{7}a^{11}+5z^{5}a^{11}-9z^{3}a^{11}+2za^{11}+2z^{12}a^{10}+4z^{10}a^{10}-37z^{8}a^{10}+73z^{6}a^{10}-55z^{4}a^{10}+16z^{2}a^{10}-2a^{10}+11z^{11}a^{9}-42z^{9}a^{9}+65z^{7}a^{9}-37z^{5}a^{9}+8z^{3}a^{9}+za^{9}+2z^{12}a^{8}+6z^{10}a^{8}-40z^{8}a^{8}+78z^{6}a^{8}-57z^{4}a^{8}+21z^{2}a^{8}-4a^{8}+6z^{11}a^{7}-15z^{9}a^{7}+19z^{7}a^{7}-10z^{5}a^{7}+2z^{3}a^{7}+2za^{7}+8z^{10}a^{6}-19z^{8}a^{6}+21z^{6}a^{6}-18z^{4}a^{6}+11z^{2}a^{6}-4a^{6}+8z^{9}a^{5}-15z^{7}a^{5}+4z^{5}a^{5}+7z^{8}a^{4}-15z^{6}a^{4}+6z^{4}a^{4}-z^{2}a^{4}+4z^{7}a^{3}-9z^{5}a^{3}+4z^{3}a^{3}+z^{6}a^{2}-2z^{4}a^{2}+z^{2}a^{2}}