In this Feb. 25, 2014 photo provided by the Washington Dept. of Transportation, temporary concrete rings used to help the massive tunneling machine being used to dig a waterfront tunnel to replace the Alaskan Way Viaduct in Seattle are shown. WSDOT says that over the next couple of weeks, the rings will be removed, making room for construction of the double-decker highway inside the tunnel. (AP Photo/Courtesy Washington Dept. of Transportation)
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