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You are told rules about a number's digits - their sum, their order, which ones may repeat - and asked which numbers obey all of them. The work is listing the possibilities in an order that cannot skip one, then testing each rule against the list.
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No indexed official paper question has been tagged with NUM-02 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.