685. What characters can be added here so that each character contains a part of the previous character? 炎 -> _ -> _ -> 増

Answer:

炎 -> 畑 -> 里 -> 増

炎  EN, honou - flame

畑  hatake - cultivated field

里  RI, sato - village

増  ZOU, ma(su), fu(eru), fu(yasu) - increase, rise, raise