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Prove or disprove: The Context - Free Languages are closed under the con - catenation operation. That is , if A and B are Context

Prove or disprove: The Context-Free Languages are closed under the con- catenation operation. That is, if A and B are Context-Free Languages, thenAB={w|w=sasb,sa in Aandsb in B}isalsoaContext-FreeLanguage.

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