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It currently consist of approximately 85 Regional Qualifying Exam sites held around the United States and its territories , along with a certain number of international schools , and a National event to be held in or around Washington D.C. at the end of April .
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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:
 None