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The US Geography Challenge aims at being more than a competition , and for this reason it also runs a Facebook page where geography-related articles and news , quizzes , links to relevant websites and blogs are posted on a regular bases to foster educational discussions and opportunities for those interested in geography as a subject .
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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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