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Finally , Wittgenstein 's idea of meaning as use led to a version of functionalism as a theory of meaning , further developed by Wilfrid Sellars and Gilbert Harman .
 Wittgenstein, Wilfrid Sellars, Gilbert Harman
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:
 Wittgenstein, Wilfrid Sellars, Gilbert Harman