2081. What characters can be added here so that each character contains a part of the previous character? a) 粒 -> _ -> _ -> 静 b) 弦 -> _ -> _ -> 胴

a) 粒 -> 音 -> 晴 -> 静  

粒  RYUU, tsubu - a grain

音  ON, IN, oto, ne - sound

晴  SEI, ha(reru) - clear up

静  SEI ,JOU, shizu(ka), shizu(meru) - quiet, peaceful, still, quieten

b) 弦 -> 畜 -> 胃 -> 胴  

弦  GEN, tsuru - string, bowstring

畜  CHIKU - animal raising, domestic animal

胃  I - stomach

胴  DOU - torso, trunk