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If Socrates changes , becoming sick , Socrates is still the same ( the substance of Socrates being the same ) , and change ( his sickness ) only glides over his substance : change is accidental , whereas the substance is essential .
 Socrates, Socrates, Socrates
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Socrates, Socrates, Socrates