Question: a) Explain why context-free languages are not closed against complementation b) Why is an input in the CYK algorithm only possible in Chomsky normal form?

a) Explain why context-free languages are not closed against complementation

b) Why is an input in the CYK algorithm only possible in Chomsky normal form?

c) What is the criterion that must be met in the CYK algorithm for a given word to be in the language?

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