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Igor Ivanović ( Cyrillic : Игор Ивановић , born 9 September 1990 ) is a Montenegrin footballer who plays for Serbian SuperLiga club OFK Beograd .
 Montenegrin, Serbian SuperLiga, OFK Beograd
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Montenegrin, Serbian SuperLiga, OFK Beograd