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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.
The test cases expect a perfect square to have the result repeat the square root twice, such as 25 -> [5,5]. It shouldn't be repeated though, and only expect it once like 25 -> [5]