The chair.

You make the calls a dentist makes. A lesion at a given depth, a symptom at 3 a.m., a specimen to place, a treatment plan full of numbers. Choose what you'd do; then see what a dentist would actually do, and why.

If your call is wrong, it says so. The reasoning is the reward.

SIT DOWN

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THE ONES YOU CALLED DIFFERENTLY

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Every call matched. Either you have done this before, or you should consider a career change. The pool is bigger than one sitting — a second round will not be the same ten.