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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.
Efficiency, readability, Matt Parker!? Killer solution all around.
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Agreed, way harder than 7. I expect they thought (as I did on first read) that the challenge was simply to return the number of months that start on Friday in a range of years.
I see I did a bit more than I needed to... props to Dr. Eaglin though! https://www.youtube.com/watch?v=Ed6ysoijxNs
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