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Problem 3. [10 points] (a) Determine whether the following two regular expressions are equivalent. Explain why or why not. (r r2) and (rir) (b) Determine

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Problem 3. [10 points] (a) Determine whether the following two regular expressions are equivalent. Explain why or why not. (r r2) and (rir) (b) Determine whether the following two regular expressions are equivalent. Explain why or why not. (rir2)" and rir2

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