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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.
Think in terms of what you are actually doing and checking for in the list.
Your code throws an error:
This is not a kata issue (= a bug in the kata).