规则Rules：
标准数独基础上，提示表示这一方向的斜线上所有的重复数字（无先后顺序）。如果没有重复的数字，会用X进行表示。
Classic rules applied. Additionally, the clue shows all the repeated numbers on the slant in this direction (It won't show the order). If there's no numbers repeated, the clue will be shown as X.
