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Nestoras Stefanidis ( born 13 April 1984 in Kilkis ) is a Greek footballer , playing for Iraklis in the Greek Football League .
 Kilkis, Greek, Iraklis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kilkis, Greek, Iraklis