seven is zero by Sisyphus

:
s/3/2a/
s/2/aa/
y/10/a /
s/^a\{7\}\b\| //
t
/a/!c0
:2
s/a/<<123456789a01>/
s/\(.\)<.*\1\(a*.\).*>/\2/
t2

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

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