A. Tanthauzo la Ulusi Wotsutsana ndi Mtedza ndi Ulusi Waufupi
Ulusi wotsutsana ndi mtedza ndi ulusi wosalala ndi mtundu wa zolumikizira zolumikizidwa, zomwe zimagwiritsidwa ntchito kukonza cholumikizira ndi kusokoneza zida zamakanika ndi zomangamanga, ndipo nthawi zambiri zimagwiritsidwa ntchito m'magawo a makina, makampani opanga mankhwala, mphamvu zamagetsi ndi zina zotero. Mitundu yonse iwiri ya zolumikizira ndi ulusi, koma pali kusiyana.