Ivalve yokukhangela ibhabhathane ibhekisa kwivalve evula ngokuzenzekelayo kwaye ivale idiski ngokuxhomekeke ekuhambeni kwesixhobo ngokwaso, kwaye isetyenziselwa ukuthintela okuphakathi ukuba kungabuyeli ngasemva.Ikwabizwa ngokuba ivelufa yokutshekisha, ivalve yendlela enye, ivalve ebuyela umva, kunye nevalve yoxinzelelo lwangasemva.Ivalve yokukhangela yik...
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