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