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Mike Shanahan was an offensive coordinator under George Seifert and went on to win Super Bowl XXXII and Super Bowl XXXIII during his time as head coach of the Denver Broncos .
 Mike Shanahan, George Seifert, Denver Broncos
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mike Shanahan, George Seifert, Denver Broncos