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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://aleama.com/%D9%81%D9%8A%D8%B3%D8%A8%D9%88%D9%83-%D8%AA%D8%B7%D9%84%D9%82-%D8%A3%D8%AF%D8%A7%D8%A9-%D9%85%D8%A7%D8%B3%D9%86%D8%AC%D8%B1-%D8%B1%D9%88%D9%85-messenger-room-%D9%84%D9%85%D9%83%D8%A7%D9%84%D9%85/>