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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.
Works fine for 2017.
Yeah, pretty stingy !
Indeed, it took me weeks to figure out that empty test cases were causing most of my "Unknown Errors".
I like your solution. It's not the best solution, but it demonstrates that your perspective on the problem evolved as you were working on it. That's why I like it.
Yes, indeed!