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By contrast , the blackout policies of the National Football League serve to encourage attendance to games instead - by only allowing them to be broadcast on television in a team 's designated market if a certain percentage of their tickets are sold prior to the game .
 National Football League
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 National Football League