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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.
The function name that is being called in sample tests (
difference) is not the same that function name in final submit (array_diff) - RustGood catch with recursive call !