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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 also got stuck on the incorrect wording. I think correct would be simply: "If arr does not contain 5 and 13, function should return: "It's a white array""
You have probably figured this out by now but I believe it's due to type coercion.
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