Ibisobanuro bigufi:

Iyi mashini ikwiranye nuburyo bwo gutunganya icyayi cyicyayi cyubwoko butandukanye bwicyayi kibisi, icyayi cyumukara hamwe nubundi buryo bwo gutondekanya icyayi, bitewe nicyayi (kirekire, kigufi, umubyimba kandi unanutse) akazi no gutandukanya imiterere itandukanye yicyayi.