Image: Sudoku Puzzle (Tourmaline)R2
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Description: "Tourmaline" - A 19-clue sudoku puzzle with two-way orthogonal symmetry by Rico Alan.
Title: Sudoku Puzzle (Tourmaline)R2
Credit: Own work. Puzzle: "Rico Alan, Tourmaline - 19 Clue Two-Way Symmetry" (posted March 9, 2009).
Author: LithiumFlash
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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