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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.
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Read the description carefully and you'll find the answer.
Read the documentation. This is not the right place to ask people to teach you programming languages.
Read this: https://docs.codewars.com/training/troubleshooting