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We can see Algorithmic Game Theory from two perspectives : The field was started when Nisan and Ronen in STOC '99 drew the attention of the Theoretical Computer Science community to designing algorithms for selfish ( strategic ) users .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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