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MELBOURNE, AUSTRALIA - AUGUST 15: Glen Boss riding Gold Symphony defeats Dwayne Dunn riding Top Me Up in Race 5, the KS Environmental Vain Stakes during Melbourne racing at Caulfield Racecourse on August 15, 2015 in Melbourne, Australia. (Photo by Vince Caligiuri/Getty Images)

MELBOURNE, AUSTRALIA - AUGUST 15:  Glen Boss riding Gold Symphony defeats Dwayne Dunn riding Top Me Up in Race 5, the KS Environmental Vain Stakes during Melbourne racing at Caulfield Racecourse on August 15, 2015 in Melbourne, Australia.  (Photo by Vince Caligiuri/Getty Images)