Douk-douk :emacs: on Nostr: I have a list of scientific names, mostly two words, sometimes one. How can I make a ...

I have a list of scientific names, mostly two words, sometimes one.
How can I make a descending list output:

From

most unique letter combinations (ie. probably a single weird name of a mushroom)To
least unique letter combinations (l guess single letters)

I think I have to do something with regexp, but I don't have a license.
Otherwise there ought to be an emacs package lying around somewhere.

Thank you for any help at all.
#emacs #frequency #analysis