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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.
You should try reading the previous posts before creating your own, it's being explained before (AleksanderPopov's post for instance).
That test is ok, you don't need to always use only 25 dollars bills to give the change.