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Hannu Veli Soikkanen ( born 4 August 1930 in Sippola ) is a Finnish historian , PhD 1965 .
 Hannu, Soikkanen, 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:
 Hannu, Soikkanen, Finnish