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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.
This is by far the most interesting codewars question for me so far and also the most clever answer.
I came to understand the code, but I honestly don't think I can come up with an answer this elegant and clean if given similar but different question.
Kudos!