Complete the following sentence: The men's 4 x 100 metres relay at the 2009 World Championships in Athletics took place at the Olympic Stadium in Berlin on August 21 and August 22. The men's 4 x 100 metres relay at the 2009 World Championships in Athletics took place at the Olympic Stadium in Berlin on August 21 and August 22. The two main contenders for the event were the reigning World Champions, the United States, and the
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