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If you want to learn about combinators and have some great fun while doing it I just can't recommend enough of this book: "To Mock a Mockingbird" by Raymond Smullyan. Don't sweat it, buy it, I haven't had so much fun in a long time.

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Seconding this book. I jumped back to the beginning of his recreational logic books and have been reading through them this year. Lots of fun, and as a programmer there’s an extra (self-induced) challenge to explore programs that can generate, solve, or interpret the systems and problems he sets up.

Thirding.

Fourthing.

And also his Godelian Puzzle Book, much fun!

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