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In opposition to the classical model of change as illusory ( as argued by Parmenides ) or accidental ( as argued by Aristotle ) , process philosophy regards change as the cornerstone of reality - the cornerstone of being thought of as becoming .
 Parmenides, 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:
 Parmenides, Aristotle