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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kojima1992.com/middleage-apps/%E5%87%BA%E4%BC%9A%E3%81%84%E7%B3%BB%E3%82%B5%E3%82%A4%E3%83%88%E7%94%BB%E5%83%8F4>