574. What character can be added to both of these characters to give other characters? 日_ -> _却

Answer:

日  NICHI, JITSU, hi, ka - sun, day

却  KYAKU - pull back, withdraw

Add 月: 日+月 月+却 

月  GETSU, GATSU, tsuki - moon, month

明  MEI, MYOU, aka(rui), a(keru) - bright

脚  KYAKU, KYA, ashi - leg