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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.
Ah you're overthinking this a lot - it's much simpler than that; maybe read the test cases to get a sense of what is being asked for (I can't help more than that without giving away the answer completely).
Hi, you should read about different joins (
inner,outer,left outer,right outer,self,cross) and understand which ones fits here.