U.S. stocks gave up gains on the session and dipped into negative territory Thursday after a rally in oil sputtered, weighing upon energy stocks. The Dow Jones Industrial Average slid 2 points to 16,349, after being up as many as 199 points earlier in the session. The S&P 500 Index fell 0.6 points to 1,948, after being up 26 points earlier. The Nasdaq Composite Index declined 18 points, or 0.4%, to 4,732, after being up about 50 points earlier.
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