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[“形式语言与自动机”实验:给定任意上下文无关文法,将其转换为Greibach范式,再转换为NPDA,并能验证给定句子是否属于该文法。][Given an context-free grammar, convert it to Greibach paradigm, then to NPDA(i.e. Non-deterministic PushDown Automaton), and verify whether any sentence belongs to the grammar.]