1946. What characters can be added here so that each character contains a part of the previous character? a) 粒 -> _ -> _ -> 吸 b) 弦 -> _ -> _ -> 恭

a) 粒 -> 辛 -> 古 -> 吸  

粒  RYUU, tsubu - a grain

辛  SHIN, kara(i) - hot, spicy, trying

古  KO, furu(i) - old

吸  KYUU, su(u) - suck, inhale, smoke

b) 弦 -> 畜 -> 異 -> 恭  

弦  GEN, tsuru - string, bowstring

畜  CHIKU - animal raising, domestic animal

異  I, koto(naru)  - be different 

恭  KYOU, uyauya(shii) - respectful, reverent