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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.
...but it works?
I've run it, and it passed the tests. My solution was based on the same idea, and it passed the tests. Are you sure you have no infite loop in your solution?