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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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It makes a slice of the array, because the trait wasn't implemented for arrays at the time of writing the solution. There's no reason to use it now in this case.