1670. What characters can be added here so that each character contains a part of the previous character? a) 化 -> _ -> _ -> 黒 b) 架 -> _ -> _ -> 肥

Answer:

a) 化 -> 旨 -> 量 -> 黒

化  KA, KE, ba(keru) - transform

旨  SHI, mune - purport, content, instruction

量  RYOU, haka(ru) - quantity, measure, weigh

黒  The "Kuro" radical - black

b) 架 -> 棋 -> 期 -> 肥

架  KA, ka(keru), ka(karu) - hang, build (a bridge)

棋  KI - go, shogi, Japanese chess

期  KI, GO - time, period, term

肥  HI, koe, ko(yashi), ko(yasu) - manure, fertilizer, grow fat