Inxalenye ende egoqekayo emva kweepleyiti ezintathu, umgca woku-1 ogoqekayo yi-180 °, umgca wesithathu ogoqekayo une-135 °. Isetyenziselwa iibhokisi ezilula ukuvula. Ipleyiti yebhanti ephezulu ehlukaniswe kunye noyilo olukhethekileyo inokulungiswa ngokweemfuno zemveliso, inika indawo yokufakela izixhobo ezikhethekileyo zohlobo lwebhokisi.