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Amongst his productions can be found Suomen työläisurheilun historia ( 3 parts , 1982-87 ) , Kaksi Saksaa ja Suomi ( 2003 ) and several academic textbooks .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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