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May 26 (Reuters) - U.S. stocks were slightly higher at the open on Thursday, after the S&P 500 posted its strongest two-day run since early March, helped by a rise in oil and as a set of economic data pointed to a strengthening economy.
The Dow Jones industrial average rose 23.35 points, or 0.13 percent, to 17,874.86, the S&P 500 gained 2.39 points, or 0.11 percent, to 2,092.93 and the Nasdaq composite added 5.21 points, or 0.11 percent, to 4,900.10. (Reporting by Tanya Agrawal; Editing by Anil D'Silva)