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In 1999 , he graduated from Landon School in Bethesda , Maryland , and deferred his acceptance to Princeton University for a year , so that he could train for his first Olympics , following his participation from the Pan American Games in Winnipeg , Canada .
 Landon School, Maryland, Princeton University, Winnipeg , Canada
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Landon School, Maryland, Princeton University, Winnipeg , Canada