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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.
When you don't know, you can ask a question, but don't post an issue saying tests are bad. Tests are ok. Your code is very inefficient. Please read this carefully and don't post issues lightly: https://docs.codewars.com/training/troubleshooting/