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This combination of four photos shows four new tablet devices being presented this week at the 2011 Consumer Electronics Show in Las, Vegas. They are, clockwise from the upper left corner: the Motorola Xoom tablet, the Dell Streak 7 4G tablet, Panasonic's Viera Tablet, and the Samsung 7 Series sliding PC. (AP Photo/Julie Jacobson, (first and third photos), Isaac Brekken, (second and fouth).

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