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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.
Fixed
Yeap, you're right, but I'm not sure it's significant - kata description does not mention this case explicitly and there're no related tests.
I'm more disappointed with negative index handling I have wrote - it's aweful.