mysterious parentheses by tails

:
s/[1-9]/&a/g
y/123456789b/012345678a/
t
s/\>/)/
s/\<0*/(/
s/aa/b/g
s/a0/5/g
s/a/()/
t

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

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