In /g?vim/: 
:%s//#/

[download]
s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/

In reply to Re^3: Adding '#' in the beginning of each line by liverpole
in thread Adding '#' in the beginning of each line by Anonymous Monk

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