Thread:TheWikiaEditMachine/@comment-28341022-20160703022638/@comment-26287306-20160703135541

It turns out, the "Furnace" category is a subcategory of "Furnaces". This means that users can still get badges for editing pages under the "Furnaces" category if their ediditng pages under the "Furnace category. I will add this exception into the editing guidelines.