Kurhwebo lwangaphandle lwe usasazo isitishi, i phezulu uphawu ngokuqinisekileyo ibaluleke kakhulu. Ngaphandle kwe uphawu, ishishini elilula libaluleke kakhulu ngokunjalo. Iindlela ezahlukeneyo zokuhlawula, uthutho olusebenzayo, ukuthunyelwa kwangexesha kubalulekile. I-SPL njengomvelisi kunye nomrhwebi wehlabathi, inokukunika konke okudingayo naphi na apho ukhoyo.