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Peter Cullen ... liked to be down and dirty in the swamp .... When he retired from his academic post , it appeared to me that there was ... no change in his work regime and he appeared to be busier than ever . "
 Cullen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cullen