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The single was first released in the United Kingdom as a digital download on 21 January 2011 ; managing to peak at number 14 and number 26 on the UK Singles Chart and Irish Singles Chart respectively .
 United Kingdom
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United Kingdom