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trends timeline for 2008%E5%B9%B4%E5%8C%97%E4%BA%AC%E3%82%AA%E3%83%AA%E3%83%B3%E3%83%94%E3%83%83%E3%82%AF%E3%81%AE%E9%99%B8%E4%B8%8A%E7%AB%B6%E6%8A%80%E3%83%BB%E7%94%B7%E5%AD%90%E3%83%9E%E3%83%A9%E3%82%BD%E3%83%B3%20-%20Athletics%20at%20the%202008%20Summer%20Olympics%20%E2%80%93%20Men's%20marathon