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Construct a regular expression that defines the language L (say) containing all the words with either exactly one aba-substring or exactly one bab-substring but not

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Construct a regular expression that defines the language L (say) containing all the words with either exactly one aba-substring or exactly one bab-substring but not both aba- and bab-substrings. (Hint: For example, the word abab does not belong to L.)

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