<https://testbook.com/objective-questions/mcq-on-theory-of-machines--5eea6a0c39140f30f369e053>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://testbook.com/objective-questions/mcq-on-theory-of-machines--5eea6a0c39140f30f369e053>