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3. (10 points) a) Consider the true statements: - If A and B are regular languages then AnB is regular. -There exist context-free languages A
3. (10 points) a) Consider the true statements: - If A and B are regular languages then AnB is regular. -There exist context-free languages A and B such that An B is not context-free Explain why the statement from problem 2; "If L is a context-free language and K is a regular language then LnK is context-free." does not contradict each of these bullet points. b) Find languages AS B CSDSE all over the alphabet (a, b, c) such that: -A is not context-free B is context-free and non-regular - C is regular D is non-regular E is regular and not \a, b, c)* Briefly justify the subset inclusions and either prove or cite examples in the book to explain why you chose each set
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