<https://www.khon2.com/news/national/move-over-calculator-these-apps-solve-math-problems-by-taking-a-picture/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.khon2.com/news/national/move-over-calculator-these-apps-solve-math-problems-by-taking-a-picture/>