Evgeniy Malov
https://gist.github.com/evgenii-malov/16ed744c98fff697164678618bb1175c
https://en.wikipedia.org/wiki/Disjoint-set_data_structure#:~:text=In%20computer%20science%2C%20a%20disjoint,a%20set%20into%20disjoint%20subsets.
Let's Implement Disjoint-set data structure with Haskell ... https://www.youtube.com/watch?v=jrnn_Hit7HI
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