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Empedocles was undoubtedly acquainted with the didactic poems of Xenophanes and Parmenides - allusions to the latter can be found in the fragments - but he seems to have surpassed them in the animation and richness of his style , and in the clearness of his descriptions and diction .
 Empedocles, Xenophanes, Parmenides
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Empedocles, Xenophanes, Parmenides