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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.
When I tried to solve it, I thought that it is worth a 4 or even a 3 kyu difficulty badge, but once I succeeded, I think this is something between 5 and 4. There are some easier 4 kyu problems than this, but also there are more difficult 5 kyu problems out there IMHO.
Great kata by the way, thanks. It was fun to solve.
You can: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#how-can-i-see-which-input-causes-my-solution-to-fail