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The show served as a tribute and featured celebrities including Bruce Forsyth , Cilla Black , Terry Wogan and Ken Dodd .
 Bruce Forsyth, Cilla Black, Terry Wogan, Ken Dodd
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bruce Forsyth, Cilla Black, Terry Wogan, Ken Dodd