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Definition and historical precessors Middle Mongol is close to Proto-Mongolic , the ancestor language of the modern Mongolic languages , which would to set at the time when Genghis Khan united a number of tribes under his command and formed the Mongol clan federation .
 Mongol, Genghis Khan, Mongol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mongol, Genghis Khan, Mongol