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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
So the random tests for Haskell include the step 'u', which isn't described in the problem...
The simplest way would be to have the user write a function that returns a distribution rather than a sample.