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Peter Gzowski 's afterword adds some historical context , and elaborates on the satirized real-life ( very real ) counterparts of several of the novel 's minor characters , including Pierre Berton .
 Peter Gzowski, Pierre Berton
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Peter Gzowski, Pierre Berton