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The 2011 Copa Libertadores de América ( officially the 2011 Copa Santander Libertadores de América for sponsorship reasons ) was the 52nd edition of the Copa Libertadores , South America 's premier international club football tournament organized by CONMEBOL .
 Santander, South America, CONMEBOL
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Santander, South America, CONMEBOL