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Author/Opus: This is the 345th puzzle from Thomas Snyder, aka Dr. Sudoku.
Rules: Standard Sudoku rules. Also, cells with a square contain an even digit; cells with a circle contain an odd digit.
Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 8th row from left to right.
Time Standards (highlight to view): Grandmaster = 7:30, Master = 9:15, Expert = 18:30