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The Dow Jones Industrial Average fell 45.86 points, or 0.19 percent, at the open to 24,117.29. The S&P 500 opened lower by 4.41 points, or 0.17 percent, at 2,643.64. The Nasdaq Composite dropped 12.62 points, or 0.18 percent, to 7,053.65 at the opening bell.