Another method is to place several cloth bags on top of each other in a box.

VOA: special.2009.09.29

I start off, either I take this path and carry on, or I take that path and carry on, but each box, if you like, gets touched exactly once.

程序开始后，或者采取这条路径然后继续，或者采取那条路径然后继续，但是每个图形，如果你喜欢这么说的话。

麻省理工公开课 - 计算机科学及编程导论课程节选

The first grade corresponds to the row player, me in this case, and the second grade in each box corresponds to the column player, my pair in this case.

单元格内第一个成绩是我的成绩,每个单元格第二个成绩是,我对手的成绩

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