Valve ya mpira pakali pano ndiyo valavu yomwe imagwiritsidwa ntchito kwambiri pamsika.Amagwiritsidwa ntchito makamaka pozungulira, kudula, ndi kusintha kayendedwe kake.Malinga ndi mtundu wa kufalitsidwa, mavavu mpira akhoza kugawidwa mu njira ziwiri mpira mavavu, njira zitatu mavavu mpira, ndi njira zinayi mavavu mpira, amene amagwira ntchito ...
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