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Which one to use?

We've seen several different set implementations. Which one should you use?

Well, I think HashSet provides a nice, general solution. This is closest to Python's set data structure.

If you want to store some characters (e.g. lowercase letters or vowels), the built-in set type may be enough. It's also good for storing flags.

IntSet is a specialized set for integers only.

If you hesitate between HashSet and IntSet, then make some tests and choose the one that performs better.