Give me a practical use-case of Multi-set

Question

I would like to know a few practical use-cases (if they are not related/tied to any programming language it will be better).I can associate Sets, Lists and Maps to practical

Answer 1

In some fields of Math, a set is treated as a multiset for all purposes. For example, in Linear Algebra, a set of vectors is teated as a multiset when testing for linear dependancy. Thus, implementations of these fields should benefit from the usage of multisets.

You may say linear algebra isn't practical, but that is a whole different debate...