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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 noe

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 noe both aba- and bab-substrings.

For example, the word abab does not belong to L.

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