1h 1d s/./\n&&&&&/g s/.*/&#\n#&/ : x /2/!{y/3456789/2345678/ x s/^../&& /gm s/[^#]*#./&&\n/ b} x s/.\(.\)./\1/g
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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