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Pentti Akseli Virrankoski ( born 20 June 1929 in Vancouver ) is a Finnish historian , PhD 1964 .
 Pentti, Virrankoski, Vancouver, Finnish
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pentti, Virrankoski, Vancouver, Finnish