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The 1955 – 56 Yugoslav First League season was the tenth season of the First Federal League ( ) , the top level association football competition of SFR Yugoslavia , since its establishment in 1946 .
 Yugoslav First League, SFR Yugoslavia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yugoslav First League, SFR Yugoslavia