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US stocks opened lower on Monday, with energy and material shares among the weakest sectors, while a selloff in Boeing Co shares pressured the Dow.
The Dow Jones industrial average was down 39.26 points, or 0.25 percent, at 15,519.57. The Standard & Poor's 500 Index was down 3.70 points, or 0.22 percent, at 1,687.95. The Nasdaq Composite Index was down 6.20 points, or 0.17 percent, at 3,606.96.
