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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 tests for an item's required keys breaks if you have additional keys. This is not specified in the description. Either change the tests or update the details.
The instructions could be more elaborate. Describe the task with words, not with a code example.