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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.
Really cool kata! A few more sample tests with slightly more numbers, and a bigger range of numbers, would be nice though, I found myself relying on random tests to debug quite a bit.