It may also shed light on images of a split-keyboard phone that recently leaked online.

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Elsewhere, American Kendall Holt retained his WBO light-welterweight title with a split decision over Demetrius Hopkins in Atlantic City.

BBC: Clinical Klitschko stops Rahman

Click the opening image to enter the sub menus, split into categories such as light, information, memory, space, time and emotion.

BBC: Webscape

Early versions split the signal into eight wavelengths of different colors of light.

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