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Which of the following languages can be generated by an unrestricted (Type-0) g...

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Which of the following languages can be generated by an unrestricted (Type-0) grammar but NOT by any context-free grammar?

{ a^n b^n c^n d^n | n ≥ 1 }

100%

Palindromes over {a,b}

{ a^n b^n | n ≥ 1 }

{ ww^R | w ∈ {0,1}* }

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