Uvavanyo lokusebenzisa kakubi iziyobisi, okanye uvavanyo lokusetyenziswa kakubi kweziyobisi, lusetyenziswa ikakhulu ukuchonga nokuqinisekisa ukuba umntu uye wasebenzisa kakubi kusini na ichiza elithile. Olu hlobo lovavanyo ludlala indima ebalulekileyo kwiinkalo ezininzi, kubandakanywa kodwa kungaphe......
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