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In this article, we discuss four dimensional non-static space-times in thebackground of de-Sitter and anti-de Sitter spaces with the matter-energysources a stiff fluid, anisotropic fluid, and an electromagnetic field. Undervarious parameter conditions the solutions may represent models of nakedsingularity and/or black holes. Finally, the energy-momentum distributionsusing the complexes of Landau-Lifshitz, Einstein, Papapetrou, and M{\o}llerprescriptions, were evaluated.

Black holes/naked singularities in four-dimensional non-static space-time and the energy-momentum distributions