3.30 Dynamic parsing. A context-free grammar is a model considered by the Chomsky school of formal linguistics. The idea is that sentences are recursively generated from high-level mental symbols through a series of production rules. For instance, ifS, N, V, and A correspond to sentences, nouns, verbs, and adjectives, we might have rules such as S NVN, AN, and so on, and finally rules that replace these symbols with actual words. Each sentence 3.30 Dynamic parsing. A context-free grammar is a model considered by the Chomsky school of formal linguistics. The idea is that sentences are recursively generated from high-level mental symbols through a series of production rules. For instance, ifS, N, V, and A correspond to sentences, nouns, verbs, and adjectives, we might have rules such as S NVN, AN, and so on, and finally rules that replace these symbols with actual words. Each sentence