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The late 1960 s and early-1970 s produced notable players like Dick Butkus , Gale Sayers , and Brian Piccolo , who died of embryonal carcinoma in 1970 .
 Dick Butkus, Gale Sayers, Brian Piccolo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dick Butkus, Gale Sayers, Brian Piccolo