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Kuvunguza ashiselwe ipayipi lensimbi
Amapayipi ensimbi okuvunguza enziwa ikhoyili yensimbi, i-extrusion yakheka ngaphansi kwezinga lokushisa elivamile, bese ithathwa ubuchwepheshe bezintambo eziphindwe kabili kanye ne-arc engaphansi kwamanzi ekabili ehlanganisiwe.