[kglqdcek] Adjacent key pairs

On a standard twelve button numeric keypad, there are 46 pairs of orthogonally adjacent keys:

11 12 14
22 21 23 25
33 32 36
44 41 45 47
55 52 54 56 58
66 63 65 69
77 74 78 7*
88 85 87 89 80
99 96 98 9#
** *7 *0
00 08 0* 0#
## #0 #9

Orthogonally adjacent are easy to type. On a touch screen, they can be swiped.

A keyboard can be depicted with multiple symbols per key: the center symbol is what you get if you repeat the number, and the symbols on the sides are what you get when the second keystroke is one key over.