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Although he played in the 1967-68 League Cup Final against Leeds United ( which Arsenal lost 1-0 ) , in the following match , an FA Cup tie against Birmingham City , he made an error which let in Birmingham 's equaliser .
 Leeds United, Arsenal, Birmingham City, Birmingham
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leeds United, Arsenal, Birmingham City, Birmingham