1457. What character can be added to both of these characters to give other characters? 折_ -> _忍

Answer:

折  SETSU, o(ru), o(reru), ori - break, fold, yield, bend, occasion

忍  NIN, shino(bu), shino(baseru) - hide, stealth, bear, endure, conceal

Add 言:折+言 言+忍 

言  GEN, GON, i(u), koto - say, speech

誓  SEI, chika(u) - swear, pledge, vow

認  NIN, mito(meru) - recognise, percieve, approve