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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.
Because it's not supported in the current Node version this kata has. I don't really think using a built-in deserves a 5kyu rating so I'm not inclined to allow a newer version of Node and enable using that.