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  Manual Thiessen

  https://albam.org/%ED%95%9C%EA%B5%AD%EC%96%B4-%EC%A7%80%EC%9B%90-%EC%98%A8%EB%9D%BC%EC%9D%B8%EC%B9%B4%EC%A7%80%EB%85%B8%EC%9D%98-%EB%AA%A8%EB%93%A0-%EA%B2%83-%EC%83%88%EB%A1%9C%EC%9A%B4-%EB%8F%84%EC%A0%84%EA%B3%BC/