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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://emu-project.org/category/%E4%B8%AD%E4%BA%95%E7%B2%BE%E4%B9%9F%E3%81%AE%E3%81%A6%E3%81%A4%E3%81%9F%E3%81%B3/>