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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.
No random tests.
Duplicate of https://www.codewars.com/kata/53da6d8d112bd1a0dc00008b
Have a look at the guide to creating your first kata. Especially the section about having a novel/unique idea.