2038. What characters can be added here so that each character contains a part of the previous character? a) 弦 -> _ -> _ -> 増 b) 案 -> _ -> _ -> 臓

a) 弦 -> 畜 -> 里 -> 増  

弦  GEN, tsuru - string, bowstring

畜  CHIKU - animal raising, domestic animal

里  RI, sato - village

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

b) 案 -> 棋 -> 期 -> 臓  

案  AN - plan, proposal

棋  KI - go, shogi, Japanese chess

期  KI, GO - time, period, term

臓  ZOU - internal organ