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International career Filipov made his debut for Bulgaria U21 on 11 October 2008 in a friendly match against Greece U21 .
 Filipov, Bulgaria U21, Greece U21
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Filipov, Bulgaria U21, Greece U21