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The Ainu also started an expedition into the Amur region , which was then controlled by the Yuan Dynasty , resulting in reprisals by the Mongols who invaded Sakhalin .
 Amur, Yuan Dynasty, Sakhalin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Amur, Yuan Dynasty, Sakhalin