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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 have no idea what I was thinking when I called this 'very bad'. But, when I claimed that this was inefficient, I wasn't talking about runtime. I'm a competitive programmer and that's all about speed - which means trying to make your code as short as possible. So it isn't inefficient in terms of runtime; but, in terms of length. It's good code though, I don't know when I claimed that it was bad.
243 is 7^3 doofus
very inefficient, very bad code