Category:Categories by material (flat list)
 | This category should only contain other categories. Galleries should be in the corresponding categories instead. Files should be in a parent or subcategory. |
 | This flat category gathers all sub-categories with the criterion “by material” in its name (whether at the end or in the middle) in a non-hierarchical list. |
 | This category is hidden and appears in the second line of categories. It is not shown if the appropriate user preference is deactivated. |
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