2355. What characters can be added here so that each character contains a part of the previous character? a) 菓 -> _ -> _ -> 絡 b) 努 -> _ -> _ -> 球

a) 菓 -> 柱 -> 素 -> 絡  

菓  KA - cake, fruit

柱  CHUU, hashira - pillar, column, pole

素  SO, SU - element, naked, simple

絡  RAKU, kara(mu), kara(maru) - be entangled

b) 努 -> 加 -> 呈 -> 球  

努  DO, tsuto(meru) - exert self, make efforts, strive

加  KA, kuwa(eru), kuwa(waru) - add, append, join, take part

呈  TEI - offer, present, exhibit

球  KYUU, tama - ball, sphere