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The Kubnya ( , , ) is a river in Chuvashia and Tatarstan , Russian Federation , a left-bank tributary of the Sviyaga River .
 Chuvashia, Tatarstan, Russian Federation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chuvashia, Tatarstan, Russian Federation