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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://conditioningtechnician.com/7902/%D9%81%D9%86%D9%8A-%D8%AA%D9%83%D9%8A%D9%8A%D9%81-%D8%B6%D8%A7%D8%AD%D9%8A%D8%A9-%D8%B9%D8%A8%D8%AF%D8%A7%D9%84%D9%84%D9%87-%D8%A7%D9%84%D8%B3%D8%A7%D9%84%D9%85/>