In the Vinony graph
It is catalogued under the topic Category namespace templates.
Vinony links it to 34 Wikipedia language editions.
~2 min read
Encyclopedic overview
For convenience, all All included should be included in this category. This includes all {{{2}}} that can also be found in the subcategories.
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Excerpted from Wikipedia’s “Template:All included” article, available under the CC BY-SA 4.0 licence.