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Pierre Duval ( born September 17 , 1932 ) is a French-Canadian operatic tenor who had an active international career during the 1960s and 1970s .
 Pierre Duval
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pierre Duval