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When you know how something ended and want to know how it started, run the steps in reverse and undo each one. Doubling becomes halving, adding becomes subtracting, and the order of the steps reverses too.
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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 LOG-08 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.