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Question: 4 a regular expression for the language over the alphabet...

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4. A regular expression for the language over the alphabet (a, b) with each string having an even number of as is (b*ab*ab*)b. Use this result to find regular expressions for the following languages a language over the same alphabet but with each string having odd number of as. (3 points) a. b. a language over the same alphabet but with each string having 4n (n >- 0) as. (3 points)
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