y/v/</ : y/abcdefghijklmnopqrstuvwxy/bcdefghijklmnopqrstuvwxyz/ s/<\w\+/&\n&/ />\</s/\<./&&/g s/.\<//mg s/b\|$/a/ /^a/!b
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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