[Haskell-beginners] "Trinary" version of Either

[Christopher Howard]

Is there a Haskell package out there that provides a "trinary" version
of Either, i.e., allowing three values instead of two? I can see how
that would be very handy. Defining one obviously wouldn't be difficult,
but it would be helpful if someone else had already developed Monad
bindings and other related stuff.

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