p s/$/@@@@@@@@@@/ h : z x s/^/0/ s/@$// h y/0123456789/1234567890/ G s/^.*\([^0@]0*\)@*\n\(.*\)[^9@]9*\(@*\)$/\2\1\3/ s/^0// /@/{h s/@//gp b} d
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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