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R. M. Hare used his parable of a lunatic to introduce the concept of " bliks " " – unfalsifiable beliefs according to which a worldview is established " – which are not necessarily meaningless .
 R. M. Hare
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:
 R. M. Hare