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Some problems need three or four ordinary steps in the right order. The skill is planning the route before calculating - writing down what you need next - so that you do not solve a step you do not need or stop one step early.
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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 MOD-10 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.