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However , he was sent off for stamping on Robbie Blake during the play-off semi-final first leg at Burnley on 9 May , having earlier conceded the winning penalty taken by Graham Alexander .
 Robbie Blake, Burnley, Graham Alexander
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robbie Blake, Burnley, Graham Alexander