s/$/%\n/ :1 /\(.\)%.*\1/b3 s/%.*/&&/ : s/\(\(.\)%.*\)%\n\(\w*\)/\1\n\2\3%/ t s/%$// :3 s/.%/%/ /^%./!b1 s///
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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