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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.
same here
The description is difficult to understand. I feel that it has nothing to do with the example. And I think that the last test is somehow wrong as others said before
Running the tests didn't work but when I submitted it the solution was correct