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Philosophers including Quine , Marcus , and Armstrong wrote a letter to the university objecting that " Derrida 's work does not meet accepted standards of clarity and rigour , " and " Academic status based on what seems to us to be little more than semi-intelligible attacks upon the values of reason , truth , and scholarship is not , we submit , sufficient grounds for the awarding of an honorary degree in a distinguished university " .
 person: Quine; person: Marcus; person: Armstrong; person: Derrida
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: Quine, Marcus, Armstrong, Derrida 
Answer:
 person: Quine; person: Marcus; person: Armstrong; person: Derrida