q 11 − 2 q 10 + 2 q 9 − 2 q 8 + q 7 − q 6 + q 4 + q 2 {\displaystyle q^{11}-2q^{10}+2q^{9}-2q^{8}+q^{7}-q^{6}+q^{4}+q^{2}}
