Isisombululo se-hopper kunye nesisindo somgqomo ngenxa yezakhono eziphezulu kunye nobukhulu beqonga bendawo enkulu. I-schema yokunyuka kweseli yomthwalo ivumela ukubethelwa ngokuthe ngqo eludongeni okanye naluphi na ulwakhiwo oluthe nkqo olufanelekileyo.
Inokuthi ifakwe kwicala lenqanawa, igcina engqondweni ubungakanani beplatter ephezulu. Uluhlu lomthamo obanzi lwenza ukuba iseli yomthwalo isebenziseke kuluhlu olubanzi lwezicelo zoshishino.