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Formal LanguagesGrammar FormalismsDiscourse Representation TheoryNatural Language ProcessingGrammarLanguage TheoryFormal GrammarsInstructions for AuthorsTheory of DiscourseContext-free GrammarHead-Driven Phrase Structure GrammarDevelopment of Human CivilizationMathematical LinguisticsFormal LanguageConjunctive GrammarsProgramming LanguagesComputational ComplexityTop-down ParsingLindenmayer SystemsFormal Linguistics