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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.
Why this works? Can we do it with x amount of arguments?
Because it's a very obvious/popular solution. Some have already submitted the same solution.
EDIT: Nevermind, I see what you mean.
WTF! Why is the solution already written in the kata?
:)