In this Dec. 18, 2012 file photo, a truck driver watches as a freight container, right, is lowered onto a tractor trailer by a container crane at the Port of Boston in Boston. The crane and a reach stacker, left, are operated by longshoremen at the port. The longshoremen's union may strike if they are unable to reach an agreement on their contract, which expires Dec. 29, 2012. A walkout by dock workers represented by the International Longshoremen's Association would bring commerce to a near halt at ports from Boston to Houston. (AP Photo/Steven Senne, File)
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