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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.
The description is perfectly clear. If you have any problems, point them out specifically, instead of saying "it's bad".
What are you talking about? There're no such tests.
Agreed, the edge cases break most solutions.
Very true, this thing is broken.