2293. What characters can be added here so that each character contains a part of the previous character? a) 如 -> _ -> _ -> 魅 b) 炎 -> _ -> _ -> 堤

a) 如 -> 吐 -> 塊 -> 魅  

如  JO, NYO - equal, like, as, as if

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

塊  KAI, katamari - lump, clod, clump

魅  MI - charm, enchant, fascinate

b) 炎 -> 畑 -> 里 -> 堤  

炎  EN, honou - flame

畑  hatake - cultivated field

里  RI, sato - village

堤  TEI, tsutsumi - bank, embankment, dike