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He used 59 players in total , as he struggled to find a ' new spine ' after the retirement of Peter Shilton , Terry Butcher and Bryan Robson .
 Peter Shilton, Terry Butcher, Bryan Robson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Peter Shilton, Terry Butcher, Bryan Robson