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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://jahaneghtesad.com/%D9%BE%D9%86%D8%AC%D8%B1%D9%87%E2%80%8C%D8%A7%DB%8C-%D8%A8%D9%87-%D8%A2%DB%8C%D9%86%D8%AF%D9%87/>