Chigongono chanjira zitatu ndi mtundu wa chitoliro chomwe chimagwiritsidwa ntchito kugawa mapaipi kukhala mapaipi awiri kapena kuphatikiza mapaipi awiri kukhala amodzi.Ili ndi mitundu yambiri yamitundu yosiyanasiyana, monga ma tee a diameter, ma tee ochepetsera, ndi zina.
