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The notion of compatibilist free will has been attributed to both Aristotle ( fourth century BCE ) and Epictetus ( 1st century CE ) ; " it was the fact that nothing hindered us from doing or choosing something that made us have control over them " .
 Aristotle, Epictetus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Aristotle, Epictetus