2686. What character can be added to both of these characters to give other characters? 安_ -> _卯

安  AN, yasu(i) - peace, cheap

卯  U, BOU, usagi - rabbit

Add 木:安+木 木+卯   

木  MOKU, BOKU, ki - tree

案  AN - plan, proposal

柳  RYUU, yanagi - willow tree