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DFA: Odd number of 'a's
Accepts any binary string over {a, b} containing an odd count of 'a's.
NFAMedium
NFA: Ends with '01'
Matches all binary strings over {0, 1} ending with the suffix '01'.
DFAHard
DFA: Substring 'abb'
Accepts any binary string over {a, b} containing 'abb' as a continuous block.
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Challenge of the Day
Which of the following describes the Kleene closure (star) of a formal language L = { ab } over the alphabet Σ = {a, b}?
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