2209. What characters can be added here so that each character contains a part of the previous character? a) 炎 -> _ -> _ -> 純 b) 動 -> _ -> _ -> 賦

a) 炎 -> 畑 -> 累 -> 純   

炎  EN, honou - flame

畑  hatake - cultivated field

累  RUI - involvement, trouble, accumulation

純  JUN - pure

b) 動 -> 加 -> 員 -> 賦  

動  DOU , ugo(ku) - move

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

員  IN - member

賦  FU - tribute, payment, installment