Thank you, for pointing me to the "factorial"
Note to self: Don't transfer mathematical/technical terms from German to English without consulting a dictionary first.
Also, would you be able to give example code for the subset iteration with Math::Combinatorics?
If there is an easy way to do so, it has escaped me.
The closest I saw in the docs was that example to generate: "Morse signals: diferent signals of 3 positions using the two symbols - and .".
Now Morse signals of length 3 are surely one-to-one and onto the subsets of a 3 element set (set elements = pos in signal; element not/contained = dot/dash)
The given iteration using next_multiset and next_string is like computing 2**n as sumk=0..n nCk
At least this is not trivial application of the modules methods.
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