Mapayipi amitundu yambiri okhala ndi mphamvu yamphamvu amagwiritsidwa ntchito kulumikiza mayunitsi awiri a zida zamagetsi, nthawi zambiri mayunitsi ogawa: mayunitsi ogwirira ntchito ndi owongolera omwe amagwiritsidwa ntchito kuwongolera magawo oyandikana ndi zophimba zamakina. Amalola kutumiza ma impulses owongolera kutali pakati pa mayunitsi owongolera ndi owongolera.