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NEW YORK, Jan 5 (Reuters) - U.S. stocks opened lower on Monday as volume returned to markets after the New Year holiday, with energy shares sliding again as crude prices fell to fresh 5-1/2 year lows.
The Dow Jones industrial average fell 57.51 points, or 0.32 percent, to 17,775.48, the S&P 500 lost 7.7 points, or 0.37 percent, to 2,050.5 and the Nasdaq Composite dropped 26.28 points, or 0.56 percent, to 4,700.54. (Reporting by Chuck Mikolajczak; Editing by Bernadette Baum)