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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.
Re-raising the discussion below as an issue: Collecting all values to a slice, sort the slice then reconstructing the linked list should not pass the tests.
Also, it seems that valid solutions can time out as well: see the first part of this solution