Izitsha eziphele kabili ziyisitsha sengilazi esiklanywe ngokukhethekile esinamachweba amabili avaliwe, ngokuvamile asetshenziselwa ukugcina nokusabalalisa amasampula oketshezi. Ukwakheka okumbaxambili kwaleli bhodlela kulivumela ukuthi lifake amasampula amabili ahlukene ngesikhathi esisodwa, noma lihlukanise amasampula abe izingxenye ezimbili ukuze kusetshenziswe ilabhorethri nokuhlaziya.