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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've found the error myself. It was easy to fix as soon as I took a look at actual function output.
I pass all the tests but when I hit a submit button the UI turns red and nothing happens. What are the conditions for passing the kata?