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The user holds the phone with two fingers of each hand on the backside of the phone. By swiping up, down, left, and right, a character is selected for input, with the thumbs on the front side of the phone used for scrolling and selection. The number of available swipe gestures combined with selection for special characters allows the KAT system to produce a total of 228 characters, more than enough for the full set of 128 ASCII characters or the 101-key QWERTY keyboard. KAT makes typing on mobile devices much easier than it is today.