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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.
It says in the description that the empty string is allowed to match.
just don't use it for any other kata.
I fixed reference solution and hopefully resolved the problem. Let me know if there's still some issue.