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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.
Your message is unclear. Your code works in some tests and fails on others, you must try to figure out where is the problem. This can help: https://docs.codewars.com/training/troubleshooting/