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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.
You probably changed the sample tests not on purpose and you didn't realize it. Try copying your solution, press the reset button, and then paste your solution again.