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<a href="https://s3.ap-northeast-2.amazonaws.com/inflearnattachment/teamlab/6_1_String.pdf">https://s3.ap-northeast-2.amazonaws.com/inflearnattachment/teamlab/6_1_String.pdf</a>12 페이지에문자열 연산 및 포함여부 검사-덧셈과뺄셈연산가능, in 명령으로포함여부체크이렇게 쓰여 있는데요.문자열 연산에 뺄셈이 있나 궁금해서 질문드렸습니다.감사합니다.

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