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Aivar Rehemaa ( born September 28 , 1982 in Tartu ) is an Estonia n cross-country skier .
 Aivar Rehemaa, Tartu
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Aivar Rehemaa, Tartu