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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.
That's even more impressive
how the hell did you guys came up with these solutions?
I like it! My first reaction was that you're still sorting twice (because you have to sort both elements of the tuple), until I recognized that you're only sorting twice when you need to break ties.