Izinhlobo zezitshalo ezahlukahlukene ezenzelwe ukwakha ukwakheka okuhle kwesakhiwo esakhiweni somuntu siqu zifaka zombili izinhlobo zezitshalo ezingafani nhlobo nokuguqulwa kwezihlahla nezihlahla ezijwayelekile. Ngokuvamile, isihlahla sama-apula sokuhlobisa sisetshenziswa ekwakhiweni kwengadi. Kuyinto engathandekiyo ezimweni zokukhula kwayo futhi ivezwa ngokuzalanisa ngendlela yezinhlobo nezinhlobo ezahlukahlukene.
