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Star players that emerged in the early 20th century include Jim Thorpe , Red Grange , and Bronko Nagurski ; these three made the transition to the fledgling NFL and helped turn it into a successful league .
 Jim Thorpe, Red Grange, Bronko Nagurski, NFL
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jim Thorpe, Red Grange, Bronko Nagurski, NFL