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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.
The example given makes it confusing, too, because the first test is similar, but not the same! It made me think ^ this issue. I also thought the test cases were wrong for my language because of this.
Could you propose something else?