It is generally a good rule to execute merging and splitting of cells at the end of the layout formatting.

通常一个很好的做法是，布局格式完成后再进行合并和拆分单元格的操作。

youdao

Thirdly, from the viewpoint of the relation between the reserved regions and the lost information in region merging, the rule of the stop merging is given.

再者，从图像合并过程中信息损失和应保留的区域数量之间的关系出发，给出了合并终止规则。

youdao

" Closely followed by "Will you rule out merging some or all of the 22 authorities?

BBC: Grasping the nettle of complexity