Uyini umehluko phakathi kukagundane nengwenya
Impumulo: Izingwenya zinempumulo ebanzi, emise okuka-U, kuyilapho izingwenya zinempumulo ebukhali, emise okuka-V. Amanzi: Izingwenya zithanda amanzi ahlanzekile, kuyilapho izingwenya zithanda amanzi anosawoti noma anosawoti, okuyinhlanganisela yamanzi anosawoti namanzi ahlanzekile.