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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.
https://www.codewars.com/kata/reviews/5db0c65918d8df0001818183/groups/5dc8b4ab2d55c30001fe5a96
This solution sometimes fails at the "tiny" random tests. A corresponding fixed test should be added.