Khofi ya khofi yokhala ndi kopanira imasunga khofi watsopano komanso wokoma kwambiri posindikiza thumba mukamaliza kugwiritsa ntchito, Chosindikizira chosindikizira chimagwiritsa ntchito kasupe wamphamvu, chisindikizocho chimakhala cholimba kwambiri ndipo sichapafupi kutsika. Zabwino kwambiri pakukopera khofi ndi koko.