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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.
Thanks for the comments! I'll probably remove it.
This is a duplicate of many katas such as https://www.codewars.com/kata/5835e18aae05334410000032 and https://www.codewars.com/kata/57fb09ef2b5314a8a90001ed.
Initial code is missing.
Random tests are also missing.