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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.
This one is easy to overthink. The answer is more straight forward then you might be thinking.
Your code is incorrect. You need to think better what you are doing. Maybe read the description a pair of times carefully and try to get it clear.
You're right, you have a problem :P The kata is fine