Pump jacks are seen in the Midway Sunset oilfield, California, in this April 29, 2013 file photo. With the prospect of another plunge in crude prices looming after two months of stability, U.S. shale oil producers may face another round of spending cuts to conserve cash and survive the downturn. REUTERS/Lucy Nicholson/Files (UNITED STATES - Tags: ENERGY BUSINESS)
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