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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://dailymedicalinfo.com/view-article/%D8%A8%D9%8A%D9%84%D8%A7%D8%AF%D9%88%D9%86%D8%A7-%D8%B3%D8%AA-%D8%A7%D9%84%D8%AD%D8%B3%D9%86/>