YY548A Choyesera Chopindika Chooneka Ngati Mtima

Mfundo ya chida ichi ndi kuyika malekezero awiri a chitsanzo cha mzere pambuyo poikanso kumbuyo pa choyikirapo choyesera, chitsanzocho chili chofanana ndi mtima, kuyeza kutalika kwa mphete yofanana ndi mtima, kuti ayesere momwe mayesowo akupindikira.