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We formulate the BES/FRS equation as a functional equation in the rapidityspace and perform its strong coupling expansion in the limit when $\ell=j/4g$is kept finite. We obtain a result which is consistent with the previouscalculations at tree level and one loop and which differs from the two-loopcalculation in 0805.4615 by a term singular at $\ell=0$.

The 2-loop generalized scaling function from the BES/FRS equation