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Russian and Armenian ( only in Nagorno-Karabakh ) are also spoken , and each are the mother tongue of around 1.5 % of the population respectively .
 Nagorno-Karabakh
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nagorno-Karabakh