어질어질 개ㅈ같은 매듭 풀기 문제
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매듭 지어지는거랑 매듭 안지어지는거를 분류해야함
펜없이 오로지 머릿속에서 시뮬레이션
매듭이론이라는 수학/물리학 분야에서 쓰이는 공간지각능력 훈련이라함
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