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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.
I think the instructions should be more clear, and the test cases should reflect all checks that need to be implemented. I found the problem fun and a small challenge, and had a lot of fun. The one-line requirement I came up with may not be the best, but I found it sufficient for the task.