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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.
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One of the conditions of the task is to not mutate nodes, so I think you can't apply your solution
@kontic I got your point, added slice before reverse and it passed all tests. But where it is mentioned that function should be pure?
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