시퀀스 다이어그램 그리는 방법
https://coding-factory.tistory.com/806
https://itwiki.kr/w/%EC%8B%9C%ED%80%80%EC%8A%A4_%EB%8B%A4%EC%9D%B4%EC%96%B4%EA%B7%B8%EB%9E%A8
비주얼 패러다임
https://www.visual-paradigm.com/tutorials/
https://www.visual-paradigm.com/support/documents/vpuserguide/94/2577/7025_drawingseque.html
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