(Close): Wall Street closed down on the half-day’s trading before Christmas.The main Dow Jones index dropped 50.44 points, or 0.3%, to 17,552.17. The wider S&P 500 and the tech-heavy Nasdaq were almost unchanged.On the Dow, after strong gains on Wednesday, energy stocks led the way down, with Chevron down 1.5% and Exxon Mobil 0.7% lower.Sportswear giant Nike implemented its two-for-one share split, cutting the value of its shares in half.

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