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