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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.
Zero-length edges would merit a mention in the description; they would be somewhat counterintuitive.
Fixed testing with adjacent parallel edges would be nice though.
The specification is ambiguous. I believe that assumption was the intent of the author because my solution passes all the tests, and there are no counterexamples given in the specification.
its clever though, right?
Don't worry, it will fail the performance version of the kata.