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A man of mild and friendly manners , as Philodemus refers , he adopted fully the philosophical system of his friend , and , although he had previously acquired great reputation as a mathematician , he now maintained with Epicurus the worthlessness of geometry .
 Philodemus, Epicurus
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:
 Philodemus, Epicurus