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n后問題
 所謂n后問題是指
“如何將n顆西洋棋中的皇后棋子擺放在
一個具有n列n行的棋盤中，但是這n顆棋子彼此不會吃掉對
方，也就是這n顆皇后棋子彼此不允許在同一列、同一行或
是同一個對角線”。
 以下是四后問題示例：
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