:0 N $!b0 s/^/#/mg : s/#\(.\)\|\(#\)/\1\2#/mg s/##/ #/g /\S#\|^ #/b s/^/# /mg h s/\n.*// s/[^#]/ /g H G h s/\n.*// s/./#/g H G
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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