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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.
Getting the same error in PHP. It's happening because one of the random tests expects a wrong answer. Keys should be increments of 1 starting at 0, but the random test asks for keys incrementing by 2.