After switching between gains and losses, U.S. stocks ended Wednesday's choppy session essentially flat. Investors remained jittery, with uncertainty hanging over Greece's future weighing on markets. The S&P 500 ended unchanged at 2,068.53. The Dow Jones Industrial Average closed 6.62 points lower at 17,862.14. The Nasdaq Composite outperformed other indexes, ending 13.54 points, or 0.3%, higher at 4,801, largely thanks to a 2.3% gain in Apple Inc, it's biggest component.
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