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The Text Retrieval Conference (TREC) encourages research in information retrieval and related applications by providing a large test collection, uniform scoring procedures, and a forum for organizations interested in comparing their results. Now in its 21st year, the conference has become the major experimental effort in the field. Participants in the previous TREC conferences have examined a wide variety of retrieval techniques and retrieval environments, including cross-language retrieval, retrieval of web documents, multimedia retrieval, and question answering.