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'''Key: 

   * Increases ["Recall"]'''
   * Not necessary for many queries and are generally of marginal use.

Using information about the relevance of results from previous searches to modify current queries is a form of RelevanceFeedback.

Types?

   * Reweighting without Query expansion - This is where we reweight the terms
   * Query expansion without reweightng - Ideally, query expansion should be done using a thesaurus that adds sysnonyms.
   * Query expansion with reweighting


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