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In ontology it is sometimes suggested that the " is " of existence is reducible to the " is " of property attribution or class membership ; to be , Aristotle held , is to be " something " .
 Aristotle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Aristotle