G : s/.\w*/&1&2&3&4&5&6/g s/\n\(1\|.2\|..3\|...\(4\|.5\|..6\)\|.*\(.\).*\3\)//mg /6\b/b s/.//
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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