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After graduating elementary and grammar school in Danilovgrad , he enrolled in Serbo-Croatian language and literature in Nikšić , Montenegro and Belgrade , Serbia .
 Danilovgrad, Nikšić, Montenegro, Belgrade, Serbia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Danilovgrad, Nikšić, Montenegro, Belgrade, Serbia