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This is the X-Sudoku

Rules:

• Standard: Every row and every column shall contain all digits 1 to 9 (no duplicates).
• Standard: The 9 squares (surrounded by thicker lines) shall contain all digits 1 to 9 (no duplicates).
• X: The two diagonal lines (indicated in light gray) shall contain all digits 1 to 9 (no duplicates).