alphabet ranges by tails (%20)

s/$/\nabcdefghijklmnopqrstuvwxyz/
s/\n.*/&\U&/
:
s/\(\(.\).\+\(.\)\)\(.*\)\1/\2-\3\4/
t
P
d

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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