<https://linguaholic.com/topic/411-did-you-learn-alone-or-with-other-students/page/2/#comment-8747>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://linguaholic.com/topic/411-did-you-learn-alone-or-with-other-students/page/2/#comment-6347>