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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.
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Random tests expect you to return the original array.
Random Tests are insufficient.
Trivial map/filter/reduce is not a novel kata idea.
Terrible description