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Rūdolfs Vītols ( died March 4 , 1942 ) was a Latvian track and field athlete who competed for the Russian Empire in the 1912 Summer Olympics .
 person: Rūdolfs Vītols; location: Russian Empire
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Rūdolfs Vītols; location: Russian Empire