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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 fails if one goes more than a single block in any direction.
While at first clever -- if you go N N S S N S N S N S -- it SHOULD work.
But your code would fail.
This function cleverly exploits the poor test coverage.