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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.
duplicate issue below
There are multiple problems with the Haskell version, the solution is also available for you to directly access.
The Haskell reference solution was incorrect. It should be good now.
Fixed
This is likely due to a site problem rather than a problem with the Kata itself - please raise an Issue Report on the official Codewars GitHub repo.