: s/[1-9]/&_/g y/123456789/012345678/ s/_0/7___/ t :2 s/0_\{16\}/_0/ t2 :3 s/._/&0123456789ABCDEF / s/\(.\)_.*\1\(.\).* /\2/ t3 s/^0//
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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