This can be subdivided into four main sub-categories.
这种模式可以被分成四种主要的子模式。
Which categories are the top-level categories, and which are sub-categories?
哪些类别是顶级类别，哪些是子类别？
This first post will have links to each of the sub-categories.
第一篇帖子会给出次级目录的链接。
There are sub categories within the category of inductive arguments.
在归纳论点分类下面，有一些次分类。
When I select a category, the different sub categories are displayed in second column.
当我选择一个类别，不同的子类别都显示在第二栏。
When I select a category, the different sub categories are displayed in second column.
当我选择一个类别，不同的子类别都显示在第二栏。
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