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On 27 April 2009 , the 22 year old striker signed a professional contract with Borussia Dortmund that will keep him at the club until 30 June 2011 .
 Borussia Dortmund
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Borussia Dortmund