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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.
I'm not a fan of testing the length condition last since that is a very fast check regardless of the size of the input. This solution also traverses the input four times, when a single pass is sufficient with other solutions.
It is concise, but I'm not sure I would consider it good.