ଛାଞ୍ଚ:Category pair
Usage
{Category pair|CATEGORY NAME1|CATEGORY NAME2}on the Category page.
Replacing "CATEGORY NAMEn" with the names only of the target categories, leaving out the term "Category:".
The first category is always displayed; the second is only displayed if it exists.
Example
{Category pair|19th century by continent|21st century by continent}→