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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.
I'm sorry. I don't get your point. Do you wish me to explain this solution or do you ask about the reasoning behind it?
That's a good point. But as of now, Katas with more than 500 submissions can't get their test cases edited.
So, not feasable.