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Parmenides ' classic claim that what does not exist cannot be thought about has been read as a claim that every truthbearer must have a truthmaker , since otherwise the truthbearer is not " about " anything .
 Parmenides
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:
 Parmenides