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Teams in Pool A were ranked 1 to 4 , teams in Pool B were ranked 5 to 8 , and so on with the team ranked 21 added to Pool E. Each team played every team in their Pool once for ranking in the single elimination knockout bracket .
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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