Difference of by tails (%20)

:
p
s/./& &/2g
s/.$//
:0
s/\w/&-/g
y/0123456789/"012345678/
s/-"-/"/
t0
s/ /9876543210 /g
s/\(.\)\{12\}\S* /\1/g
t

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

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