1: How can you prove that a language is not regular using the pumping lemma?
2: What are context-free grammars (CFG)?
3: How are CFGs different from regular languages?
4: What is a pushdown automaton (PDA)?
5: What is the difference between deterministic and non-deterministic pushdown automata (DPDA and NPDA)?
6: What is the Chomsky hierarchy?
7: Where do regular languages fall in the Chomsky hierarchy?
8: Define context-free languages.
9: How does a PDA recognize context-free languages?
10: What is a Turing machine?
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