U.S. stocks ended Wednesday's session lower, taking a pause after two straight days of gains. The main indexes retreated as Federal Reserve Chairwoman Janet Yellen hinted that a rate hike in December will not derail the economy. The S&P 500 fell 7.46 points, or 0.4%, to 2,102.33. The Dow Jones Industrial Average fell 50.57 points, or 0.3%, to 17,867.58. The Nasdaq Composite ended the day down 2.65 points, or less than 0.1%, at 5,142.48.
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