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이미 step3에서 피드백주신 방식으로 step3이 In -> Out 방식으로 TDD 되어
step4는 리팩토링 interface 분리, Cyclic Dependencies 방어 해보기로 알찬 경험을 할 수 있었습니다.
지금까지 �감사드립니다.