Partition of a set with haskell

Set partioning with haskell https://gist.github.com/evgenii-malov/44213a01384bc263a13c5108ef2d1a00

A partition of a set X is a set of non-empty subsets of X such that every element x in X is in exactly one of these subsets (i.e., X is a disjoint union of the subsets).

https://en.wikipedia.org/wiki/Partition_of_a_set https://en.wikipedia.org/wiki/Bell_numbers https://oeis.org/A000110 - Bell numbers ... https://www.youtube.com/watch?v=cIwDq9dhMtg