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For example , one need not commit to either the existence of true theories or true contradictions , but would rather prefer a weaker standard like empirical adequacy , as proposed by Bas van Fraassen .
 Bas van Fraassen
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:
 Bas van Fraassen