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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.
An identical kata has been approved already, so this one should be unpublished.
Null handling is not specified anywhere and only appears in the tests, and frankly it's pointless since it doesn't add anything to the task.