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From Tekkenpedia

Stubs are very short articles that don't have much text in them. You'll know if they're a stub if they have the stub template that looks like this:

This article is a stub (short article) and you can help Tekkenpedia by expanding it.

If you want to expand the stub, click on "expanding it" or click on edit. Stubs are only under the article namespace. If you see a project page, template, talk page, MediaWiki project or anything else that is short, that doesn't make it a stub. It only goes under the article namespace. You can see the namespace at the top next to where it says discussion.