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When time allows, confirm an answer a different way: estimate it, plug it back in, or count a small case by hand. A second method that agrees is worth far more than reading your first method again, because rereading repeats the same mistake.
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Nothing yet. No other skill in the Atlas lists this one as a prerequisite.
No indexed official paper question has been tagged with CFT-11 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.