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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.
Your code is failing when the array provided is empty. You access arr[0] without checking if the array contains any elements, so your code will be getting an array index out of bounds error and so failing the test.
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