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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.
What would you name it instead? I came up with the same solution, but used "item" instead of "e." (Also - how would you use "e" as a number in math? - You got me all curious now!)