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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.
Thank you for your reply. Makes sense.
Newbie question here. I feel like I just completed a Kata where if you didn't check for if arr is None then it would throw an error. Why doesn't this throw an error if arr is None?
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