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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.seyana.online/%D8%AA%D9%88%D9%83%D9%8A%D9%84-%D9%83%D9%84%D9%81%D9%8A%D9%86%D9%8A%D8%AA%D9%88%D8%B1-kelvinator/>