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Charles Butterworth , Ph.D. ( born 1938 ) is a noted philosopher of the Straussian school and currently a professor of political philosophy at the University of Maryland , College Park .
 Butterworth, Straussian school, University of Maryland , College Park
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Butterworth, Straussian school, University of Maryland , College Park