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We study singular 1/2 BPS solutions in M-theory using 11-dimensional
superstar solutions. The superstar solutions and their corresponding plane
wave limits could give an insight how one may deform the boundary conditions
to get singular, but still physically acceptable, solutions. Starting from M-
theory solutions with an isometry, we will also study 10-dimensional solutions
coming from these M-theory solutions compactified on a circle.
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