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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.
They take turns attacking each other and when one dies the game ends. In other words: simultaneous deaths cannot happen.
Yes, you're right, the tests helped me out on this one. Should have used
sorted-setinstead.