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Set in the early 20th century , the song contains allusions to boxers Jack Dempsey and Jack Johnson ; it also credits Sylveste with averting the sinking of the Lusitania .
 Jack Dempsey, Jack Johnson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jack Dempsey, Jack Johnson