z 7 a 15 − 4 z 5 a 15 + 4 z 3 a 15 + 3 z 8 a 14 − 10 z 6 a 14 + 8 z 4 a 14 + 6 z 9 a 13 − 21 z 7 a 13 + 29 z 5 a 13 − 24 z 3 a 13 + 8 z a 13 + 8 z 10 a 12 − 25 z 8 a 12 + 33 z 6 a 12 − 23 z 4 a 12 + 2 z 2 a 12 + 8 z 11 a 11 − 20 z 9 a 11 + 19 z 7 a 11 + z 5 a 11 − 14 z 3 a 11 + 6 z 12 a 10 − 10 z 10 a 10 + 7 z 8 a 10 − 2 z 6 a 10 + 9 z 4 a 10 − 10 z 2 a 10 + 3 a 10 + 2 z 13 a 9 + 12 z 11 a 9 − 50 z 9 a 9 + 88 z 7 a 9 − 81 z 5 a 9 + 53 z 3 a 9 − 15 z a 9 + 13 z 12 a 8 − 28 z 10 a 8 + 19 z 8 a 8 + 10 z 6 a 8 − 13 z 4 a 8 + 12 z 2 a 8 + a 8 + 2 z 13 a 7 + 17 z 11 a 7 − 56 z 9 a 7 + 64 z 7 a 7 − 33 z 5 a 7 + 18 z 3 a 7 − 7 z a 7 + 7 z 12 a 6 + 5 z 10 a 6 − 57 z 8 a 6 + 92 z 6 a 6 − 74 z 4 a 6 + 30 z 2 a 6 − 5 a 6 + 13 z 11 a 5 − 21 z 9 a 5 − 11 z 7 a 5 + 35 z 5 a 5 − 27 z 3 a 5 + 2 z a 5 + 15 z 10 a 4 − 36 z 8 a 4 + 25 z 6 a 4 − 14 z 4 a 4 + 6 z 2 a 4 − 2 a 4 + 11 z 9 a 3 − 27 z 7 a 3 + 17 z 5 a 3 − 5 z 3 a 3 + 2 z a 3 + 5 z 8 a 2 − 12 z 6 a 2 + 7 z 4 a 2 + z 7 a − 2 z 5 a + z 3 a {\displaystyle z^{7}a^{15}-4z^{5}a^{15}+4z^{3}a^{15}+3z^{8}a^{14}-10z^{6}a^{14}+8z^{4}a^{14}+6z^{9}a^{13}-21z^{7}a^{13}+29z^{5}a^{13}-24z^{3}a^{13}+8za^{13}+8z^{10}a^{12}-25z^{8}a^{12}+33z^{6}a^{12}-23z^{4}a^{12}+2z^{2}a^{12}+8z^{11}a^{11}-20z^{9}a^{11}+19z^{7}a^{11}+z^{5}a^{11}-14z^{3}a^{11}+6z^{12}a^{10}-10z^{10}a^{10}+7z^{8}a^{10}-2z^{6}a^{10}+9z^{4}a^{10}-10z^{2}a^{10}+3a^{10}+2z^{13}a^{9}+12z^{11}a^{9}-50z^{9}a^{9}+88z^{7}a^{9}-81z^{5}a^{9}+53z^{3}a^{9}-15za^{9}+13z^{12}a^{8}-28z^{10}a^{8}+19z^{8}a^{8}+10z^{6}a^{8}-13z^{4}a^{8}+12z^{2}a^{8}+a^{8}+2z^{13}a^{7}+17z^{11}a^{7}-56z^{9}a^{7}+64z^{7}a^{7}-33z^{5}a^{7}+18z^{3}a^{7}-7za^{7}+7z^{12}a^{6}+5z^{10}a^{6}-57z^{8}a^{6}+92z^{6}a^{6}-74z^{4}a^{6}+30z^{2}a^{6}-5a^{6}+13z^{11}a^{5}-21z^{9}a^{5}-11z^{7}a^{5}+35z^{5}a^{5}-27z^{3}a^{5}+2za^{5}+15z^{10}a^{4}-36z^{8}a^{4}+25z^{6}a^{4}-14z^{4}a^{4}+6z^{2}a^{4}-2a^{4}+11z^{9}a^{3}-27z^{7}a^{3}+17z^{5}a^{3}-5z^{3}a^{3}+2za^{3}+5z^{8}a^{2}-12z^{6}a^{2}+7z^{4}a^{2}+z^{7}a-2z^{5}a+z^{3}a}