2215. What characters can be added here so that each character contains a part of the previous character? a) 炎 -> _ -> _ -> 納 b) 動 -> _ -> _ -> 地

a) 炎 -> 畑 -> 累 -> 納  

炎  EN, honou - flame

畑  hatake - cultivated field

累  RUI - involvement, trouble, accumulation

納  NOU, TOU, NA, NAN, osa(meru) - pay, supply, accept, store

b) 動 -> 加 -> 吐 -> 地  

動  DOU , ugo(ku) - move

加  KA, kuwa(eru), kuwa(waru) - add, append, join, take part

吐  TOU, ha(ku) - spew, vomit, give vent to

地  CHI, JI - earth, land