1736. What character can be added to both of these characters to give other characters? 任_ -> _曽

Answer:

任  NIN, maka(seru) - entrust, responsibility

曽  SOU, katsute - overlap

Add 貝:任+貝 貝+曽 

貝  KAI - shellfish

賃  CHIN - rent, wages, fee

贈  ZOU, SOU, oku(ru) - give, present, bestow