국립국어원 답변
https://www.korean.go.kr/front/onlineQna/onlineQnaView.do?mn_id=216&qna_seq=120133
https://www.korean.go.kr/front/onlineQna/onlineQnaView.do?mn_id=216&qna_seq=193821&pageIndex=1
https://www.korean.go.kr/front/onlineQna/onlineQnaView.do?mn_id=216&qna_seq=193969&pageIndex=1