q 2 − q + 2 − 2 q + 2 q 2 − 2 q 3 + 1 q 4 − 1 q 5 + 1 q 6 {\displaystyle q^{2}-q+2-{\frac {2}{q}}+{\frac {2}{q^{2}}}-{\frac {2}{q^{3}}}+{\frac {1}{q^{4}}}-{\frac {1}{q^{5}}}+{\frac {1}{q^{6}}}}
