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The figure shows 10 rows of keys combined with 3, 5, or 6 columns. Row 1
has 6 keys, rows 2 and 3 have 3 keys each, and rows 4 through 10 have 5
keys each. There are 4 arrow keys located on the right-hand side of the
keyboard in the space occupied by rows 2 and 3.
Each key has three, four, or five functions. The main key function correspond
to the most prominent label in the key. Also, the green left-shift key,
key (8,1)
,
the red right-shift key,
key (9,1)
, and the blue ALPHA key,
key (7,1)
, can be