seven is zero by McBusLuck

:
s/3/21/
s/2/11/
s/[0 ]\|^1\{7\}\b//
s/1\{10\}/:/
t
s/$/9876543210/
s/\w\{9\}//
s/\w//2g
s/::/2/
s/:/1/

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

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