Question 1:
Let L be the language consisting of all strings of a's and b's containing the substring abba.
a) Construct a DFA for L.
b) Represent the DFA for L as regular expression.
b) Show the DFA for L scanning the shortest possible word in L.
(Hint: A substring "abba" can comes at the beginning, middle or end of a string of a's and b's of L)
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