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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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The random tests test the user's solution against .. the user's solution. That's not how that works.
Also, you need fixed tests as well. Copy the example tests as fixed tests at least; solutions that don't pass the example tests should not ever be able to pass the submit tests.