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A detail misread, a question with two defensible answers, a book we should cover next - reports like these fix the dataset for everyone.
A factual error
Every answer traces back to one dataset, so a verified correction fixes every quiz that
used the fact. Name the quiz and the question; the rest is quick.
An ambiguous question
Multiple-choice lives and dies on there being exactly one defensible answer. The accounts
differ between books at points – if you can argue two of the four options, we want to hear
the argument.
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