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If I could broaden the question - what have you found useful of the well-known data structures that a self-taught dev may not be fully aware of?

Yes! That also makes sense. But even people going through formal CS education might miss a lot of things.

I learnt something called "Probabilistic Timed Automata". That was actually perfect for one problem we were trying to solve!

I consider Dictionary (Hash Maps) as well known. But bloom filters not so.