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Gilbert Ryle thought the problem could be seen in terms of dealing with " a galaxy of ideas " rather than a single idea , and suggested that category mistakes are made when a concept ( e.g. " university " ) , understood as falling under one category ( e.g. abstract idea ) , is used as though it falls under another ( e.g. physical object ) .
 Gilbert Ryle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gilbert Ryle