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Paris Saint Germain's Jeremy Menez, left, challenges for the ball with Valencienne's Hamed Doumbia, during their French League one soccer match, at the Parc des Princes stadium, in Paris, Friday, Feb. 14, 2014. (AP Photo/Thibault Camus)

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Paris Saint Germain's Ezequiel Lavezzi, left, challenges for the ball with Valencienne's Nicolas Penneteau, during their French League one soccer match, at the Parc des Princes stadium, in Paris, Friday, Feb. 14, 2014. (AP Photo/Thibault Camus)

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Paris Saint Germain's Ezequiel Lavezzi, right, heads the ball, during his French League one soccer match against Valenciennes, at the Parc des Princes stadium, in Paris, Friday, Feb. 14, 2014. (AP Photo/Thibault Camus)

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Paris Saint Germain's Ezequiel Lavezzi, right, challenges for the ball with Valencienne's Nicolas Penneteau, during their French League one soccer match, at the Parc des Princes stadium, in Paris, Friday, Feb. 14, 2014. (AP Photo/Thibault Camus)

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Paris Saint Germain's Zlatan Ibrahimovici, right, challenges for the ball with Valencienne's Nicolas Penneteau, bottom, during their French League one soccer match, at the Parc des Princes stadium, in Paris, Friday, Feb. 14, 2014. (AP Photo/Thibault Camus)

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Paris Saint Germain's Zlatan Ibrahimovic, center, celebrates with teammates after scoring a goal, during their French League one soccer match against Valenciennes, at the Parc des Princes stadium, in Paris, Friday, Feb. 14, 2014. (AP Photo/Thibault Camus)

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The river Shakhe runs through the village of Bolshoi Kichmai, Russia, Saturday, Feb. 15, 2014. The Circassian ethnic group that lives in the region says Olympic construction companies have taken so much gravel from the river that their wells are running dry. While the Winter Games are played out in gleaming arenas just a few dozen kilometers (miles) away, Circassians in Bolshoi Kichmai struggle to get by on tourism in a town with few amenities. (AP Photo/Angela Charlton)

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In this photo taken Saturday, Feb. 15, 2014, Aisa Achmizov, director of the local folk art museum, shows off traditional smoked cheese made by his Circassian tribe in the village of Bolshoi Kichmai, Russia. Circassians are a Muslim ethnic group who live in villages sprinkled through the Sochi region, just a few dozen kilometers (miles) from where the Winter Olympic games are being played out in gleaming arenas. (AP Photo/Angela Charlton)

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This video frame grab provided by Fox 29 Philadelphia shows traffic accidents involving multiple tractor trailers and dozens of cars on Pennsylvania Turnpike outside Philadelphia, on Friday, Feb. 14, 2014. The crashes were reported just after 8 a.m. Friday, one day after the area got about a foot of snow that left roads slick. Television news helicopter footage showed several tractor-trailers and dozens of cars involved in a series of accidents that had backed up traffic for miles between the Bensalem and Willow Grove exits. (AP Photo/Fox 29 Philadelphia)

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This video frame grab provided by Fox 29 Philadelphia shows traffic accidents involving multiple tractor trailers and dozens of cars on Pennsylvania Turnpike outside Philadelphia, on Friday, Feb. 14, 2014. The crashes were reported just after 8 a.m. Friday, one day after the area got about a foot of snow that left roads slick. Television news helicopter footage showed several tractor-trailers and dozens of cars involved in a series of accidents that had backed up traffic for miles between the Bensalem and Willow Grove exits. (AP Photo/Fox 29 Philadelphia)

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Vehicles are piled up in an accident Friday, Feb. 14, 2014, in Bensalem, Pa. Traffic accidents involving multiple tractor trailers and dozens of cars have completely blocked one side of the Pennsylvania Turnpike outside Philadelphia and caused some injuries. (AP Photo/Matt Rourke)

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Vehicles are piled up in an accident Friday, Feb. 14, 2014, in Bensalem, Pa. Traffic accidents involving multiple tractor trailers and dozens of cars have completely blocked one side of the Pennsylvania Turnpike outside Philadelphia and caused some injuries. (AP Photo/Matt Rourke)

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Vehicles are piled up in an accident Friday, Feb. 14, 2014, in Bensalem, Pa. Traffic accidents involving multiple tractor trailers and dozens of cars have completely blocked one side of the Pennsylvania Turnpike outside Philadelphia and caused some injuries. (AP Photo/Matt Rourke)

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Vehicles are piled up in an accident Friday, Feb. 14, 2014, in Bensalem, Pa. Traffic accidents involving multiple tractor trailers and dozens of cars have completely blocked one side of the Pennsylvania Turnpike outside Philadelphia and caused some injuries. (AP Photo/Matt Rourke)

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In this Feb. 2, 2014 photo people take pictures of each other in a cave at Apostle Islands National Lakeshore in northern Wisconsin, transformed into a dazzling display of ice sculptures by the arctic siege gripping the Upper Midwest. The caves are usually are accessible only by water, but Lake Superior’s rock-solid ice cover is letting people walk to them for the first time since 2009. (AP Photo/The Minneapolis Star Tribune, Brian Peterson) MANDATORY CREDIT; ST. PAUL PIONEER PRESS OUT; MAGS OUT; TWIN CITIES TV OUT

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In this Feb. 2, 2014 photo, people walk past a cave at Apostle Islands National Lakeshore in northern Wisconsin, transformed into a dazzling display of ice sculptures by the arctic siege gripping the Upper Midwest. The caves are usually are accessible only by water, but Lake Superior’s rock-solid ice cover is letting people walk to them for the first time since 2009. (AP Photo/The Minneapolis Star Tribune, Brian Peterson) MANDATORY CREDIT; ST. PAUL PIONEER PRESS OUT; MAGS OUT; TWIN CITIES TV OUT

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This Feb. 11, 2014 photo the pier and lighthouse at Lake Michigan’s Little Traverse Bay at Petoskey, Mich., is surrounded by thick ice. Nearly 88 percent of the Great Lakes’ surface area has frozen over this winter, the most extensive ice-over in 20 years. (AP Photo/John Flesher)

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POOL PHOTO -- In this Feb. 11, 2014 aerial photo the Mackinac Bridge over the the Straits of Mackinac spans an ice cover that stretches into the horizon in Michigan. As of Feb. 13, the ice cover extended across 88 percent of the Great Lakes and almost completely covered, according to the federal government’s Great Lakes Environmental Research Laboratory in Ann Arbor. (AP Photo/ Traverse City Record-Eagle, Keith King Pool)

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The Coast Guard Cutter Biscayne Bay, a 140-foot ice-breaking tug, sails the waters near Chicago and toward the shores off Indiana, Feb. 12, 2014. The Biscayne Bay helped break ice on the southern part of Lake Michigan to assist commerce. (Coast Guard photo by Chief Petty Officer Alan Haraf)

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U.S. Secretary of State John Kerry, center, takes a tour of the Foton Cummins Engine plant in Beijing, China Saturday, Feb. 15, 2014. Kerry toured the plant and made remarks on climate change cooperation between the United States and China. (AP Photo/Evan Vucci, Pool)