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Stocks are closing mostly lower in light trading, led by declines in energy stocks as the price of crude oil sinks. Halliburton and Transocean each lost 4% Monday, the AP reports. The Nasdaq composite notched a small gain as biotech companies rose following the acquisition of pharmaceutical company Medivation, but other major indexes edged lower. The Dow Jones industrial average fell 23 points, or 0.1%, to 18,529. The Standard & Poor's 500 index lost 1 point, less than 0.1%, to 2,182. The Nasdaq composite rose 6 points, or 0.1%, to 5,244. Trading volume was very light, as it has been all month. The price of crude oil fell 3% to $47 a barrel. Bond prices rose. The yield on the 10-year Treasury note fell to 1.54%. (Read more Dow Jones stories.)