Question: Construct a regular expression that defines the language L containing all words beginning with exactly double a or exactly double b . That is ,

Construct a regular expression that defines the language L containing all words beginning with exactly double a or exactly double b. That is, L contains all words that start with only 2 as or bs. Words in L are at least of length 2 and words such as aa, bb, bbababa and aabaabbabbbabb do belong to L; words such as a, b, babababa, bbbababa and aaaabbabbbabb do not belong to L.

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