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David Pears ( 8 August 1921 - 1 July 2009 ) was a British philosopher renowned for his work on Wittgenstein .
 person: Pears; person: Wittgenstein
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: Pears, Wittgenstein 
Answer:
 person: Pears; person: Wittgenstein