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Isifosiyisimo esixakile ezijiyeza kabi ukusebenza kwazo zonke izingxenye noma ingexenye ethileyesiphili,futhi lokhu kusuke kungabangelwa ukulimala noma ikuphi kwangaphandle. Izifo zaziwa ngokuba izimo zokugula eziyamaniswa nezimpawu noma izinkomba ezicacile.