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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.
Not all nested loops are inherintly O(n^2). And it is a case here as I explained here
Most performant, this solution is not. But dang if it doesn't look sexy.