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The 1989 Super Cup was played on a home-and-away basis , and was contested by Milan , winners of the 1988 – 89 European Cup , and Barcelona , who had won the 1988 – 89 European Cup Winners ' Cup .
 Milan, Barcelona
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Milan, Barcelona