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Martti Johannes Häikiö ( b. 1 October 1949 in Mikkeli ) , is a Finnish historian and writer .
 Martti, Häikiö, Mikkeli, 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:
 Martti, Häikiö, Mikkeli, Finnish