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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.
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It's honestly baffling that your solution works at all. It's solely because the test cases are poorly written and your solution can oftentimes solve that specific case that's being generated over and over.