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NEW YORK, Dec. 15 (Xinhua) -- Oil prices settled mixed on Friday as investors turned their attention to climbing U.S. output.

The West Texas Intermediate for January Delivery added 26 U.S. cents to settle at 57.30 dollars a barrel on the New York Mercantile Exchange, while Brent crude for February delivery erased 8 cents to close at 63.23 dollars a barrel on the London ICE Futures Exchange. Enditem