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Author Initial. Author Surname, 'Title', Patent Number, Year Published.
 Amazon.com, Inc. (Seattle, WA), 'Personalized recommendations of items represented within a database', 6317722, 2001.
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the service generates the recommendations using a previously generated table that maps items to respective lists of "similar" items. To generate the table, historical data indicative of users' affinities for particular items is processed periodically to identify correlations between item interests of users (e.g., items A and B are similar because a large portion of those who selected A also selected B). Personal recommendations are generated by accessing the table to identify items similar to those selected by the user.