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The Russian Empire , which had withdrawn from the war in 1917 after the October Revolution , lost much of its western frontier as the newly independent nations of Estonia , Finland , Latvia , Lithuania , and Poland were carved from it .
 Russian Empire, Estonia, Finland, Latvia, Lithuania, Poland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Russian Empire, Estonia, Finland, Latvia, Lithuania, Poland