mysterious parentheses by %20

:
y/_0123456789/ \x09012345678/
s/\w/& /g
t
s/\s\+/(&)/
s/  /_/g
s/ \x09/5/g
s/ /()/
/\w/b
s/\x09//g

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

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