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数独是一种运用数字进行演算的逻辑游戏，起源于18世纪末的瑞士。19世纪初，数独游戏已逐渐成形。一个9×9的方形盘面，被分割成了9个3×3的小九宫格，而玩家需要做的是在给定数字的基础上，将盘面填满，使得每行、每列、每宫都是数字1~9不重复。
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