47634
Other coaches , such as Pop Warner and Knute Rockne , introduced new strategies that still remain part of the game .
 Pop Warner, Knute Rockne
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:
 Pop Warner, Knute Rockne