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Robert Michael Howfield ( born 3 December 1936 ) , commonly known as Bobby Howfield , is an English former professional sportsman who played both association football and American football .
 Howfield, Bobby Howfield, English
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Howfield, Bobby Howfield, English