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Author/Opus: This is the 4th puzzle from guest contributor Bryce Herdt.
Rules: Standard Sudoku rules. Also, in the cells with red letters, a number can only be entered if it contains that letter when spelled out in Spanish.
Answer String: Enter the 1st column from top to bottom, followed by a comma, followed by the 9th column from top to bottom.
Time Standards (highlight to view): Grandmaster = 7:30, Master = 12:00, Expert = 24:00