如果出现这种情况，顶级网格将生成最大数目的单元格，该数目具体取决于“级别1”密度。
In this case, the top-level grid generates the maximum number of cells, and that number depends on the level 1 density.
为了实现这个目的，页面使用了大量嵌套的表和小的间隔图片，用来强制表单元格宽度。
To achieve this, the pages used numerous nested tables and small spacer images to enforce table cell widths.
显示空单元格，了' S '和' T '表示的开始点和目的地分别机器人。
'indicating the empty cell, the' s' and 't' indicating the start point and the destination of the robot respectively.
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