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Itheminali yokuphumayo yesibali sikhathi ikhiqizwa nge flat-head Jack-uhlobo isokhethi ukunikeza izintambo zikagesi ezikahle uma zifakwa isibali sikhathi ezintweni zokusebenza ezingaphansi kokuphumayo amafomethi namafomethi okulinganisa othintana naye.