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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.
If the problem is easily attacked with Streams, why not use them? I don't agree that the question calls specifically for solutions that only use arrays. That seems like an artificial limitation. I also don't agree with premature optimization.