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RIO DE JANEIRO, BRAZIL - AUGUST 7: Katie Ledecky of USA competes during the Women's 400m Freestyle Final during the swimming competition of the 2016 Olympic Games at Olympic Aquatics Stadium on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Jean Catuffe/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 7: Katie Ledecky of USA competes during the Women's 400m Freestyle Final during the swimming competition of the 2016 Olympic Games at Olympic Aquatics Stadium on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Jean Catuffe/Getty Images)