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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 is clever up to the point of reinforced test cases. Had this as a first taught, but then I didn't even try it thinking it'd be too slow. I guess never overestimate the test cases :)
First solution that came to my mind as well. Looks very neat compared to others. :D