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In wartime , Attwell appeared as a guest player for Leeds United , making his debut on 21 February 1942 in the 0 – 1 defeat to Blackburn Rovers .
 Attwell, Leeds United, Blackburn Rovers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Attwell, Leeds United, Blackburn Rovers