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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.
Has anyone tried it in haskell? I've tried in in GHCI, with all powers up to 2^1000 and it functions correctly but for me the tests don't pass in codewars.