This generates 10000 characters of random text, based on training strings.
Recommended that you use cabal sandbox, so that nothing you install here gets into your general cabal directory:
cabal sandbox init
You may want to make sure you have the latest and greatest, though cabal will probably warn you if you need to do this:
cabal update
Now build everything:
cabal install --dependencies-only
cabal build
There's a directory called training. Put however many files you want in there, ending in .txt. These will be used as training text.
./random-chain