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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.
Please don't post solutions in the kata's Discourse without spoiler flag.
The last element of your input array is "" - this could throw an exception in some cases.