由于程序步骤简单，没有规定规则，且棋子消失后不会再出现，所以不允许悔棋。
As the process is simple and does not require rules, and the piece disappears, will not happen again, so not allowed to undo.
由于程序步骤简单，没有规定规则，且棋子消失后不会再出现，所以不允许悔棋。
As the process is simple and does not require rules, and the piece disappears, will not happen again, so not allowed to undo.
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