1902. What characters can be added here so that each character contains a part of the previous character? a) 菓 -> _ -> _ -> 紳 b) 誓 -> _ -> _ -> 吸

Answer:

戸  KO, to - door

包  HOU, tsutsu(mu) - wrap

Add 月:戸+月 月+包 

月  GETSU, GATSU, tsuki - moon, month

肩  KEN, kata - shoulder

胞  HOU - sac, sheath, placenta