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Career Bristol Rovers A product the of Rovers youth system , Richards joined the professional ranks at the club in the summer of 2009 , along with fellow youth players Neikell Plummer , Dan Cayford , Mark Cooper , Ollie Clarke , George Booth , Steve Kingdon and Jack McKenna .
 Bristol Rovers, Rovers, Richards, Ollie Clarke
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bristol Rovers, Rovers, Richards, Ollie Clarke