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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 discourse section on the original kumite creator (@burlacu.valeri) has the creator replying to someone that the expected behaviour for empty strings should be "TRUE". I think i might have misinterpreted that and gave "TRUE" if even one of them is empty. I'll change my code. Thanks for catching that!