64499
1996 The Denver Broncos re-signed Clark in February 1996 and allocated him to the World League of American Football , where he played for the Rhein Fire .
 Denver Broncos, Clark, World League of American Football, Rhein Fire
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Denver Broncos, Clark, World League of American Football, Rhein Fire