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Risto Ilmari Ulmala ( born May 7 , 1963 in Helsinki , Finland ) is a former Finnish long-distance runner .
 Risto, Ulmala, Helsinki, Finland, 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:
 Risto, Ulmala, Helsinki, Finland, Finnish