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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.
Not sure why many people think this is good practice and clever... this will evaluate ALL the string options, consuming unecessary CPU cicles for results that won't be used. It will work, though might not be the most performant solution.