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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://audiopub.co.kr/2019/03/17/sanyo-mr-x20-%ED%8F%AC%ED%84%B0%EB%B8%94-%EC%B9%B4%EC%84%B8%ED%8A%B8-big-ben/>