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Beside a group of former BSK players , the squad was formed by footballers from another Belgrade club , SK Slavija from Belgrade suburb Vračar , a number of players from another club formed by Stojanović , FK Šumadija 1903 , and Czech footballers Edvard Mifek , Venčel Petrovický and Alojz Mahek .
 BSK, Belgrade, SK, Belgrade, Vračar, Stojanović, FK Šumadija 1903
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 BSK, Belgrade, SK, Belgrade, Vračar, Stojanović, FK Šumadija 1903