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