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Iavnou 's best finish at the FIS Nordic World Ski Championships was 13th in the 4 x 10 km relay at Sapporo in 2007 while his best individual finish was 36th in the 50 km event at those sam championships .
 Sapporo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sapporo