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The National Football League does not have a minor league system as of 2011 but it has operated or affiliated with minor leagues in the 1930 s , 1940 s , 1960 s , 1990 s , and the early 2000 s and invested in one in the late 2000 s .
 National 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:
 National Football League