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We study strings on orbifolds of AdS₅ S⁵ by SU (2) discrete groups in the Penrose limit. We derive the degenerate metrics of pp wave of AdS₅ S⁵/ using ordinary ADE and affine ADE singularities of complex surfaces and results on N=4 CFT₄'s. We also give explicit metric moduli depencies for abelian and non abelian orbifolds.
Sahraoui et al. (Tue,) studied this question.