Ndi kapangidwe kake kodalirika komanso kokhazikika, mphamvu yonyamula kwambiri, mphamvu yabwino kwambiri ya injini, magwiridwe antchito okhazikika, komanso chimango chake chopangidwa m'mafakitale omanga ndi migodi okhala ndi malo oyipa ogwirira ntchito, amagwiritsidwa ntchito kwambiri potengera zotengera.