PDF Search with Synonyms: Problems and Solutions

3. There are many new synonyms devel-oped from the Web over time. Mp3 and mpeg3 were not synonyms twenty years ago; snp newspaper and snp online carry the same query intent only after snponline.com was published. Manually editing synonym list is pro-hibitively expensive. Thus, we need an auto-matic synonym discovery system that can learn ................
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