Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Hanyar wucewa: Rushewar zirga-zirgar kai tsaye, watau, sauyin yanayi na F → S na kai tsaye, na iya faruwa a cikin kewayon yawan kwararar ruwa a cikin kwararar kyauta. Kerner ya bayyana, bisa ga bayanan da aka samu, cewa saboda yiwuwar lalacewar zirga-zirga na kwatsam ko na kwatsam a daidai wannan hanyar babbar hanya a kowane lokaci akwai kewayon hanyoyin manyan hanyoyi a cikin matsala. Wannan kewayon hanyoyi na hanyoyi yana tsakanin ƙananan ƙarfin  Tambaya: Yaushe lalacewar zirga-zirga zai iya faruwa?
babbar hanyar kwalliya a kowane lokaci