21520
National championships followed in 1947 and 1949 , with only a 14 – 14 tie against USC in the season finale marring a perfect season in 1948 and another possible national title .
 USC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 USC