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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 had the same solution but without the '+' and of course got a string returned. Had to google this unary plus and learned something really cool and valuable today thanks to you. Thanks!