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He started in the 2007 Premiership final victory against Gloucester and the back-to-back Premiership titles in 2009 and 2010 .
 organization: Gloucester
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Gloucester