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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.
Thank you for your suggestion!
I saw your solution, but it was not actually working as I expected, so I decided to solve it like this:
https://www.codewars.com/kata/reviews/554398d646002df491000183/groups/5dc2fa1a83a99000015a24ba
Very clean & readable. I like this solution a lot.