Jos Backus wrote:

> Sounds like you want a Bag, not a Set. I don't know of aany 
> implementation but
> it's probably not hard to create one - all you have to do is keep track 
> of the
> count of each element.

I've just read that elements in Set must be unique (because of Math). So 
I'm going to solve my problem using arrays. Thanks for answer.
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