How to write a context-free grammar for the set of strings
Problem
How to write a context-free grammar for the set of strings over the alphabet {a, b} where each string has odd length and the middle character is an a. bbaaa and abaabba are strings but aaaa and abbba are not.
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How to write a context-free grammar for the set of strings over the alphabet {a, b} where each string has odd length and the middle character is an a. bbaaa.
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