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David Sloan , ( born 28 October 1941 ) , is a former Northern Irish professional footballer who played for Scunthorpe United , Oxford United and Walsall .
 Sloan, Northern Irish, Scunthorpe United, Oxford United, Walsall
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sloan, Northern Irish, Scunthorpe United, Oxford United, Walsall