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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 LOVE the clarity and readability of this code. All of our production code should strive to be this understandable.
Thanky you! I was approaching the problem as if it was just looking for the total number of results that contain d, not the total number of times d appears.