[Haskell-cafe] Implementing parental using blood type

[Rafael Almeida]

Hello,

I'm trying to practice my Haskell. So I had the idea of making a program
which, given a mother's and a child blood type, it can determine whether a
certain father is possible or not.

Please take a look on this gist with my implementation:

    https://gist.github.com/aflag/14429dfb2e89791a44e2#file-parentaltesting

Would you care to comment on it? It looks a bit cumbersome to my eyes. I'm
trying to find the most intuitive and elegant way of do it. I'm not so much
worried with performance.

[]'s
Rafael
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