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When several items must be matched one-to-one, a grid with a cross for impossible and a tick for certain does the bookkeeping. Every tick immediately crosses out the rest of that row and column, which is where most of the progress comes from.
Saved in this browser only. No account, nothing sent anywhere.
No indexed official paper question has been tagged with LOG-03 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.