https://www.oranlooney.com/post/playfair/#known-plaintext-at...

Slightly more complicated than the toy examples shown in the documentation above, and hints at one of the real world use cases for Z3 - red teaming cryptography.

That said, I'm not sure the documentation linked above is really doing it any favors in terms of helping popularizing it.

Z3 is a high-performance theorem prover being developed at Microsoft Research.