2427. What characters can be added here so that each character contains a part of the previous character? a) 章 -> _ -> _ -> 増 b) 翌 -> _ -> _ -> 腕

a) 章 -> 古 -> 吐 -> 増  

章  SHOU - chapter, badge, mark

古  KO, furu(i) - old

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

増  ZOU, ma(su), fu(eru), fu(yasu) - increase, rise, raise

b) 翌 -> 音 -> 明 -> 腕  

翌  YOKU - next, following

音  ON, IN, oto, ne - sound

明  MEI, MYOU, aka(rui), a(keru) - bright

腕  WAN, ude - arm, ability, talent, skill