如图所示。这次我们要把视角改成列上。这个题的所有强区域是列方向而非行方向的。
## 涂色方式说明
图中按整行和整列染色是为了标识删数是按列来进行删数的，也就是说这几个列有背景色表示的是它是弱区域所用到的列。后面的例子也会进行如此方式的染色。
其中，强区域是用候选数为单位染色，弱区域是按区域类型或单元格进行染色。另外，强区域会有四种不同的配色方案：
* 绿色是行强区域；
* 橙色的列强区域；
* 蓝色是宫强区域；
* 紫色是单元格强区域。
其中的后两种情况会在下一篇的内容里出现。
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