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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 kata should definitely be at least a 5kyu or 4kyu. It was really annoying to solve.
It definitely needs more test cases to stump the user. At least a good 10-20 I think, to discourage copy & pasting the test case results to pass.