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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 test case is fine. I see you have solved it already. So it means you have figured it out. It's not the series of bombs. All of them explode at the same time.
Thanks for solving my kata!