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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.
It's a simple solution - but it goes over the numbers twice, once for max and once for min.
You can speed this up by calculating both min and max in one pass only.
Wish I could mark this answer as both Clever and Best Practices - because it's definitely the best answer!