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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://binbo-joshi.com/category/%E5%AE%9F%E9%8C%B2%EF%BC%81%E3%83%93%E3%83%B3%E3%83%9C%E3%83%BC%E8%A9%B1%EF%BC%81/%E5%AE%9F%E9%8C%B2%EF%BC%81%E3%81%8A%E9%87%91%E3%81%8C%E3%81%AA%E3%81%84%EF%BC%81>