2887. What characters can be added here so that each character contains a part of the previous character? a) 篤 -> _ -> _ -> 紋 b) 案 -> _ -> _ -> 絵

a) 篤 -> 駐 -> 素 -> 紋

篤 YUU, sugu(reru), yasa(shii)  - excel, gentle, tender

駐 CHUU - stop, reside

素 SO, SU - element, naked, simple

紋 MON - crest, pattern

b) 案 -> 柱 -> 素 -> 絵

案 AN - plan, proposal

柱 CHUU, hashira - pillar, column, pole

素 SO, SU - element, naked, simple

絵 KAI, E - picture