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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.
Yeah, so please wait warmly while we're waiting for a fix D:
FYI: https://github.com/Codewars/codewars.com/issues/893
Just like Voile said, codewars have problems with itself :c.
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You shouldn't mutate the original array because it's used for both your solution and the internal solution.
Don't mutate your original array, that's most often a bad practice.