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Although the two clubs had previously contested many important matches , such as the 1979 FA Cup Final , the rivalry is generally perceived to have begun with a notorious match at Old Trafford on 20 October 1990 , which resulted in both clubs being docked points in the 1990 – 91 First Division .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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