Numuboko wa kabiri wavuguruwe bapfa imashini, kuki bamwe bashobora kugera ku ireme ry'imashini nshya, kandi imashini iboshye cyane ku buryo bwo gufata imashini. Sisitemu, kuri kashe, ibintu byose bigomba kurenganurwa, bitabaye ibyo, ikintu kizagenda nabi . kugirango uhindure amavuta ya kabiri. kugabanya ingufu zabantu .
