2980. What characters can be added here so that each character contains a part of the previous character? a) 案 -> _ -> _ -> 腕 b) 粒 -> _ -> _ -> 臓

a) 案 -> 棋 -> 期 -> 腕

案 AN - plan, proposal

棋 KI - go, shogi, Japanese chess

期 KI, GO - time, period, term

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

b) 粒 -> 音 -> 明 -> 臓

粒 RYUU, tsubu - a grain

音 ON, IN, oto, ne - sound

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

臓 ZOU - internal organ