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Juan Pablo Valdivieso ( born February 27 , 1981 in Washington , D.C. , United States ) is a retired Peruvian swimmer , who specialized in butterfly events .
 Juan, Valdivieso, Washington , D.C., United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Juan, Valdivieso, Washington , D.C., United States