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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 reason why the last test failed in your case is because its randomness caused the
textto end with a space. I've fixed it. Have your code (the one that excluded spaces) failed every time you submited or just once?