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==Category tree==
All of the categories form a hierarchy, although sub-categories may be a member of more than one category. An example of a small part of this hierarchical structure is shown:
{| align="center"
|- align="center" |
|- ▼
|▼
|
|- align="center" |
| '''↓'''
|
|-
|
| → [[:Category:History of Australia]]▼
|
|
|- align="center" |
| → [[:Category:History of the United States]]▼
|
| '''↓'''
▲|-
|
|- align="center" |
▲|
|
|
|
|- align="center" |
| '''↓'''
| '''↓'''
| '''↓'''
|- align="center" |
| [[:Category:History of Zambia|Category:History of <br> Zambia]]
|- align="center" |
| '''↓'''
| '''↓'''
|
|- align="center" |
| New South Wales, Queensland, <small>etc.</small>
| Alabama, Alaska, Arizona, <small>etc.</small>
|
|}
The actual relationship is more complex since a category may appear as a subcategory of several other categories. The actual relationship of part of the category structure looks like this:▼
▲The actual relationship is more complex since a category may appear as a subcategory of several other categories. The actual relationship of part of the category structure looks somewhat like this:
[[File:Category-diagram.png|400px|center]]▼
▲[[File:Category-diagram.png|border|400px|center]]
The uppermost category in the hierarchy is [[:Category:Contents]]. From here all other categories branch out, including those that are used for the maintenance of Wikipedia.
If an entry in a category is shown in ''italics'' it is a redirect to an article of a different name or a section of an article that contains information about that particular subject.
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