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shortC, 24 bytes f(C*s){*s&&f(s+1)^P*s);} Try it online! A shortC conversion of @Sisyphus's C (gcc) implementation.
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#1: Initial revision
# [shortC], 24 bytes f(C*s){*s&&f(s+1)^P*s);} [Try it online!][TIO-ku9wz39n] A shortC conversion of [**@Sisyphus**](https://codegolf.codidact.com/users/53580)'s [C (gcc)](https://gcc.gnu.org/) [implementation](https://codegolf.codidact.com/posts/279639/279701#answer-279701). [shortC]: https://github.com/aaronryank/shortC [TIO-ku9wz39n]: https://tio.run/##K87ILypJ/v8/TcNZq1izWqtYTS1No1jbUDMuAMi3rv3vmKahlJiUnJKalq70HwA "shortC – Try It Online"