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18. Give examples of languages L1 and L2 over {a,b} that satisfy the following descriptions. a) L1 is regular, L2 is nonregular, and L1L2 is

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18. Give examples of languages L1 and L2 over {a,b} that satisfy the following descriptions. a) L1 is regular, L2 is nonregular, and L1L2 is regular. b) L1 is regular, L2 is nonregular, and L1L2 is nonregular

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