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This module implmements a version of keyboard distance for fuzzy
string matching. Keyboard distance is a measure of the physical
distance between two keys on a keyboard. For example, 'g' has a
distance of 1 from the keys 'r', 't', 'y', 'f', 'h', 'v', 'b', and
'n'. Immediate diagonals (like ''r, 'y', 'v', and 'n') are considered
to have a distance of 1 instead of 1.414 to help to prevent
horizontal/vertical bias.
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