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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 don't know what makes people think this is good practice, but it's definitely clever. Using 3 for loops for a kata like this is messy and a bit redundant. No shade to this solution, it's a cool way to think about the problem!