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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.
Let's say you have to find out if 100000000000 is a prime number, when you find it's divisible by 2, you already know it's not a prime number, there is no need to check all the other numbers at all.
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