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