Constraint programming complement ML/AI/LLM nicely in system solving real world problems [1],[2],[3],[4]. One of the highest stakes and hardest engineering problems namely wireless spectrum frequency allocation was solved by constraint programming and presented in [1]. Now anyone can try to solve the problem in a MiniZinc tutorial. Fun fact, there's also Knuth in the presentation audience trying to get some info on the subject matter perhaps for his next book.

[1] Logic, Optimization, and Constraint Programming: A Fruitful Collaboration - John Hooker - CMU (2023) [video]:

https://www.youtube.com/live/TknN8fCQvRk

[2] "We Really Don't Know How to Compute!" - Gerald Sussman - MIT (2011) [video]:

https://youtube.com/watch?v=HB5TrK7A4pI

[3] Google OR-Tools:

https://developers.google.com/optimization

[4] MiniZinc:

https://www.minizinc.org/