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Theoretical Computer Science
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In this article we continue the investigation of insertion-deletion systems having a context only on one side of insertion or deletion rules. We show a counterpart of the results obtained in (Matveevici et al., 2007) by considering corresponding systems and exchanging deletion and insertion parameters. We prove three computational completeness results and one non-completeness result for these systems. We also solve the remaining open problem concerning the generative power of insertion-deletion systems having both contexts by proving the computational completeness of systems having a context-free insertion of two symbols and a contextual deletion of one symbol.