1923. What characters can be added here so that each character contains a part of the previous character? a) 弦 -> _ -> _ -> 績 b) 案 -> _ -> _ -> 続

a) 弦 -> 畜 -> 累 -> 績

弦  GEN, tsuru - string, bowstring

畜  CHIKU - animal raising, domestic animal

累  RUI - involvement, trouble, accumulation

績  SEKI - achievements, spinning

b) 案 -> 柱 -> 素 -> 続

案  AN - plan, proposal

柱  CHUU, hashira - pillar, column, pole

素  SO, SU - element, naked, simple

続  ZOKU, tsuzu(ku) - continue