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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.
I was confused by the [ and ] brackets in the code, since they aren't mentioned in any of the examples of the instructions. But browsing through the comments I saw some testcases which helped me understand what exactly they do.