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Dee Elbert Mackey ( October 16 , 1934 February 26 , 2001 ) was an American football tight end who played professionally for six seasons in the National Football League and the American Football League .
 Dee, Mackey, National Football League, American Football League
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dee, Mackey, National Football League, American Football League