h G : h s/\S/ /2g s/^\( *\)\(.\)\(\1 *\)$/\3\2\1/m s/^\( *\) \( *\) \2\(\S\)\1$/\1\3\2\3\2\3\1/m /\S *\S/!{g s/.*\n//} P g s/\S/ / / \n/d t
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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