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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.
For what it's worth, from my perspective I thought it was pretty clear. I wonder what you think is poorly explained?
I don't think the problem is well explained at all.
This doesn't even work, you get index out of range as you're trying to access element N on slice with length N