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Sokolov ( , masculine ) or Sokolova ( , feminine ) , also Sokoloff , or rarely Sokolove is one of the top ten most common Russia n last name s. It is derived from the Russian word " " ( sokol , meaning falcon ) .
 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:
 Russia