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Jukka Taneli Nevakivi , ( 8 October 1931 in Pudasjärvi ) , is a Finnish historian , Ph.D. 1963 .
 Jukka, Nevakivi, Pudasjärvi, 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:
 Jukka, Nevakivi, Pudasjärvi, Finnish