Iingcango zomlilo zentsimbi (kubandakanya umnyango omnye, umnyango ophindwe kabini, umnyango ophindwe kabini) ziphathwa ngokupeyintwa kwendawo. Iingcango zomlilo zensimbi zinokwahlulwa zibe yimigangatho emithathu: A, B, kunye noC ngokobunzima obuhlukeneyo. Ukuphakama komgangatho, kungcono ukugquma isandi kunye nokufudumeza ubushushu bomnyango womlilo.