Question: Construct a regular expression and corresponding deterministic finite automaton (DFA) defining a language comprising all strings of length 5 or more such that the letter

a language comprising all strings of length 5 or more such that

Construct a regular expression and corresponding deterministic finite automaton (DFA) defining a language comprising all strings of length 5 or more such that the letter appearing just before the last is same as the second letter of the string. Assume X = {a,b} for all the questions unless specified otherwise

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