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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://malabed.com/blog/%D8%A7%D9%84%D8%AA%D9%81%D9%83%D9%8A%D8%B1-%D8%A7%D9%84%D8%AA%D8%B5%D9%85%D9%8A%D9%85-design-thinking/>