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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.dentalthai.org/article/%E0%B8%88%E0%B8%B1%E0%B8%94%E0%B8%9F%E0%B8%B1%E0%B8%99%E0%B8%94%E0%B8%B2%E0%B8%A1%E0%B8%AD%E0%B8%99/>