Question: Problem 7 Let COMPLETES _ R in L , wx in R , where R is some regular language. In other words, it's the language

Problem 7 Let COMPLETES_R in L,wx in R, where R is some regular language. In other words, it's the language of all strings which when appended to the front of some string in L, create a string in R. Prove by construction on PDAs that the set of context-free languages is closed under COMPLETES_R for all R. Hint: think about what transitions we should be following when reading the input, and what to do afterwar

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