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The Arsenal F.C. – Manchester United F.C. rivalry is a notable rivalry in English football as both clubs are recognised as having great history and traditions .
 Arsenal F.C., Manchester United F.C.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Arsenal F.C., Manchester United F.C.