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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.
Do note that with the list comprehension needing to build an entire list before returning the first element, this code would need to parse the entire input list even if it detects the problem element early on.