I-elbow yendlela-ntathu luhlobo lokufakelwa kombhobho osetyenziselwa ukwahlula umbhobho kwimibhobho emibini okanye ukudibanisa imibhobho emibini ibe yinto enye. Ineentlobo ezininzi ezahlukeneyo zeefom, ezifana nee tee ezilingana nobubanzi, ii tee zokunciphisa, njl.
