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OCR: Terminal symbols { { the ito, a, Sarah, book, returns, library} Non terminal {Phrase, VerbalPhrase, NounPhrase, PrepositionalPhrase, symbols Vetb; Noun; Preposition, Specifier} Production rules Phrase :> NounPhrase VerbalPhrase PrepositionalPhrase, NounPhrase >> Noun, NounPhrase :>SpecifierNoun, PrepositionalPhrase > Preposition NounPhrase, VerbalPhrase '> Verb NounPhrase, Verbais returns, Noun's book, Noun - library; Noun > Sarah; Specifier > the; Specifier - a, Preposition - to Start symbol Phrase Figure 3: Context-free grammar is defined by four items