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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.
Tests are not good enough to catch faulty solutions. There should really be more random tests, and some good fixed tests.
It is not established that which direction of
+yand+xis. In mathematics notation+yis always up, while in ASCII notation+yis almost always down.