You're replying to a comment by Robert Massaioli.

January 27, 2015, 00:32

Over the weekend I wrote a program that I call setdown that does many set operations from files. I would really recommend that you check it out. It is written in Haskell so it is very fast and efficient: https://bitbucket.org/robertmassaioli/setdown

You can install it just by running: cabal install setdown

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