A warning sign for the Keystone Pipeline stands outside of the TransCanada Corp. Hardisty Terminal 1 in Hardisty, Alberta, Canada, on Saturday, Dec. 7, 2013. Canadian heavy crude reached its strongest level in more than two months on the spot market as a pipeline connection to the U.S. Gulf Coast began filling with crude ahead of its startup next month. Photographer: Brett Gundlock/Bloomberg via Getty Images
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