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얼음땡 › %EB%91%90%EB%B2%8C%EC%8B%9D%EA%B3%BC%EC%84%B8%EB%B2%8C%EC%8B%9D%EC%82%AC%EC%9A%A9%EC%9E%90 › 종이접기 › 결합의오류 › From''MathematicalDiscovery,NewYork,1981''& › 2007년에일어났으면하는일