( q t + 1 1 − t ) ( q s 4 t 5 + q 2 s 2 t 5 + q s 3 t 4 + s 4 t 3 + q 2 s t 4 + 3 q s 2 t 3 + 2 q 2 t 3 + q s t 2 + 2 s 2 t + q 2 s − 1 t 2 + 3 q t + q 2 s − 2 t + q s − 1 + t − 1 + q s − 2 t − 1 ) {\displaystyle \left({\frac {{q}{t}+1}{1-t}}\right)({q}s^{4}t^{5}+q^{2}s^{2}t^{5}+{q}s^{3}t^{4}+s^{4}t^{3}+q^{2}{s}t^{4}+3{q}s^{2}t^{3}+2q^{2}t^{3}+{q}{s}t^{2}+2s^{2}{t}+q^{2}s^{-1}t^{2}+3{q}{t}+q^{2}s^{-{2}}{t}+{q}s^{-1}+t^{-1}+{q}s^{-{2}}t^{-1})}
