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    Wait, does that mean all the tests are sudokus that can be solved by filling in naked singles? I know the description says that the tests are "easy" but I didn't think that was what was meant. Implemented a general sudoku brute-forcer instead (seems fast enough on random "hard" sudokus from the web). I guess it would be better to correct the description, but the author was online in 2017 for the last time, so I'm not sure that is possible.