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In 2003 , CITV celebrated their 20th anniversary with an event called the " CITV Birthday Bash " , which saw former and current presenters come together , along with invited children , to celebrate the channel 's history .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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