Twelve by McBusLuck

y/0123456789/CDEFGHIJKL/
s/./\l&/
y/CDEFGHIJKL/0123456789/
:
/c./{s///;y/x/1/;p;d}
y/defghijklab0123456789AB/cdefghijkla123456789ABC/
s/C/x0/
b

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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