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