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Richard Anthony DiBernardo ( born June 12 , 1964 ) is a former American football linebacker who played for the St. Louis Cardinals and the Los Angeles Rams of the National Football League ( NFL ) .
 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