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We compute the flat coordinates on the Frobenius manifolds arising on the deformation space of Gepner ŜÛ(3)_k chiral rings. The explicit form of the flat coordinates is important for exact solutions of models of topological CFT and 2d Liouville gravity. We describe the case k=3, which is of particular interest because apart from the relevant chiral fields it contains a marginal one. Whereas marginal perturbations are relevant in different contexts, their analysis requires additional care compared to the relevant perturbations.doi:10.1088/1751-8113/49/41/41lt02 fatcat:olw2incqmzgv3ers2kwzjdtice