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Iindidi zeengcango zomlilo zihlulwe kakhulu kwiingcango zomlilo zokhuni kunye neengcango zomlilo zensimbi. Ahlulahlulwe abe ngamabanga amathathu: iBanga A, iBanga B kunye neBakala C. Amabakala amathathu ubukhulu becala bubude bexesha lokunyamezela umlilo. Iklasi A umnyango ongenamlilo, ngokunyamezela umlilo we-1.2; Umnyango weKlasi B ongenamlilo, ngokunyamezela umlilo we-0.9; Ucango lweKlasi C olungenamlilo, kunye nokunyamezela komlilo kwe-0.6.

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