When you create articles with the same name but different article types-- e.g. an ethnicity and a language, an organization and a location-- only one of the two shows up in search results from the dashboard or the main world searchbar, and only one shows up in article tags. I believe it's the one first created, but I'm not sure.
1. Create an article and select a template. 2. Create another article with the same name, but using a different template. 3. Use the search bar on the Dashboard or within any article to search the title shared by the above two articles. Only one will appear.