When you get confused at any particular step of any particular problem, mark it with a giant question mark and you're the margin. You have 48 hours to get every question mark that you wrote down in your lecture notes filled in with your understanding. When I solve this problem on a blank sheet of white paper from scratch without looking at my notes, narrating out loud what each step means,. If you can do that, you know it. It's everything that matters.

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