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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.
Your solution is timing out because it's not efficient enough. Think about what you can do so you don't necessarily have to go through every single number each time!
Not a kata issue, your code is too slow.