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Ludwig Wittgenstein ’s conclusion was that there were no clear definitions which we can give to words and categories but only a " halo " or " corona " of related meanings radiating around each term .
 Ludwig Wittgenstein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ludwig Wittgenstein