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Series 7 of the Channel 4 show began on Channel 4 on 23 February 2009 and concluded its run on 22 May 2009 .
 Channel 4, Channel 4
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Channel 4, Channel 4