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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.
This. At least, in the python case, I forgot about the test for a length of 10 and was still able to pass the test suite. That should be fixed.
I was surprised that so few of the solutions looked at this as a series of coordinate translations. Glad to see someone else took my approach. It would definitely be a bit more general outside of a quad grid.