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U.S. stocks opened lower on Thursday on worries about the possibility of a Greek default and an unexpected rise in weekly jobless claims.
The Dow Jones industrial average fell 49.94 points, or 0.27 percent, to 18,113.05, the S&P 500 lost 2.34 points, or 0.11 percent, to 2,121.14 and the Nasdaq Composite dropped 7.06 points, or 0.14 percent, to 5,099.53.
