a 13 z + a 12 z 2 + a 11 z 3 − a 11 z + a 10 z 4 − 2 a 10 z 2 + a 9 z 5 − 3 a 9 z 3 + a 9 z + a 8 z 6 − 5 a 8 z 4 + 7 a 8 z 2 − 3 a 8 + a 7 z 5 − 4 a 7 z 3 + 3 a 7 z + a 6 z 6 − 6 a 6 z 4 + 10 a 6 z 2 − 4 a 6 {\displaystyle a^{13}z+a^{12}z^{2}+a^{11}z^{3}-a^{11}z+a^{10}z^{4}-2a^{10}z^{2}+a^{9}z^{5}-3a^{9}z^{3}+a^{9}z+a^{8}z^{6}-5a^{8}z^{4}+7a^{8}z^{2}-3a^{8}+a^{7}z^{5}-4a^{7}z^{3}+3a^{7}z+a^{6}z^{6}-6a^{6}z^{4}+10a^{6}z^{2}-4a^{6}}
