2323. What character can be added to both of these characters to give other characters? 安_ -> _支

安  AN, yasu(i) - peace, cheap

支  SHI, sasa(eru) - branch, support

Add 木:安+木 木+支   

木  MOKU, BOKU, ki - tree

案  AN - plan, proposal

枝  SHI, eda - branch