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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.
The purpose of the code timing out is to help recognize inefficient code. If you are passing all of the other tests and timing out for some that means that there is a more efficient solution that should be used to solve the problem.