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The Usva River ( ) is a river in Perm Krai in Russia , right tributary of the Chusovaya River ( Kama 's basin ) .
 Perm Krai, Russia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Perm Krai, Russia