Biirta rogrogmada ee wareegsan waxay ka kooban tahay afar qaybood oo isku xiran: koonka (giraanta gudaha), koobka (giraanta dibadda), duubayaasha wareegsan (walxaha rogrogmada) iyo qafiska (haya duubka). Biirta rogrogmada ee wareegsan ee dhexdhexaadka ah iyo kuwa toosan ee taxanaha mitirka ah waxay isticmaalaan lambarka xagasha xiriirka "C" ama "D" siday u kala horreeyaan ka dib lambarka daloolka, halka aan la isticmaalin koodka biirta xagasha caadiga ah. Biirta rogrogmada ee xagasha dhexdhexaadka ah waxaa ugu horreyn loo isticmaalaa ulaha pinion ee geerka kala duwan ee baabuurta.
