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We investigate lexical paraphrasing in the context of two distinct applications: document retrieval and node identification. Document retrieval -the first step in question answering -retrieves documents that contain answers to user queries. Node identification -performed in the context of a Bayesian argumentation system -matches users' Natural Language sentences to nodes in a Bayesian network. Lexical paraphrases are generated using syntactic, semantic and corpus-based information. Ourdoi:10.3115/1118984.1118997 dblp:conf/acl-iwp/ZukermanGW03 fatcat:ur5424nb2rcehjkoqyzvjeytoy