Ivalve yebhola yentsimbi engenastainless, ivalve yeglowubhu, ivalve yesango xa isetyenziswa, kuphela xa ivulwe ngokupheleleyo okanye ivaliwe, musa ukuvumela ukwenza ummiselo wokuhamba, ukuze kuthintelwe ukutywinwa kokhukuliseko lomphezulu, ukunxiba okukhawulezileyo. Iivalvu zesango kunye neevalvu zeglowubhu ezingaphezulu zinesixhobo sokutywina esibuyela umva, ivili lesandla ukuya phezulu kuthi...
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