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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.
Honestly I din't know about the min function either, but was also able to do it with a loop. I personally think that will help you in the long run. You can learn all the shortcuts later, if you know how to work through the problem without a built in function, that's great imo.