To close this week-long tour of Logic Puzzle Open unused constructions, here's a puzzle from an entire genre that didn't make the cut: Arithmetic Square! This is a puzzle type that most people are probably familiar with even if they haven't done this explicit genre before, but in the end we decided to limit the number of math genres in that round.
Rules: Place each of the numbers 1 through 9, one per cell, so that the indicated arithmetic operations hold when read left-right or up-down. (There are normally a few extra rules for how expressions should be parse, but they're not needed here.)
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