Watch this, where he goes through the questions and explains how he did it: https://www.youtube.com/watch?v=1Mx_xhiIRpw
I'm pretty good with Excel, my main tool at the job for over 20 years. I understand how he did it, but it's just really humbling...
I still think quality of what you do with Excel (idea) is more important than how you do it (skill).
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