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William James F. ' Billy ' Croxon ( 1871 – 1949 ) was an English footballer who played in The Football League for Sheffield United and Rotherham Town .
 Sheffield United, Rotherham Town
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sheffield United, Rotherham Town