Question: 23. Define an operation third on strings and languages as third (aja2a3a4a5a6 . ..)-a3a6 with the appropriate extension of this definition to languages. Prove the

23. Define an operation third on strings and languages as third

23. Define an operation third on strings and languages as third (aja2a3a4a5a6 . ..)-a3a6 with the appropriate extension of this definition to languages. Prove the closure of the family of regular languages under this operation

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