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For the last few Olympics the United States, Russia and China have been duking it out for the top spot on the medal table. This time around, they'll also have to contend with host nation, Great Britain. The hosts will have an athlete automatically qualify for each sport and have the home field advantage.
Will it be enough for the home team?
(Editor's note: We'll be using the IOC rules for this and counting the country with the most gold medals as the winner)