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However , when the show proved to be a success , they requested an additional seven , the first ones of which creators Trey Parker and Matt Stone had to produce quickly .
 person: Trey Parker; person: Matt Stone
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: Trey Parker, Matt Stone 
Answer:
 person: Trey Parker; person: Matt Stone