Assume the alphabet ∑ is {a, b, c}. In the following questions, give a regular expression that represents the described set.   a) The set of all strings over {a, b, c} containg at least one b or at least one c.   b) The set of all strings over {a, b, c} that begins with bb and ends with cc.   c) The set of all strings over {a, b, c} that contains the substing ab or bc.

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