<https://www.satbusinessconsulting.com/single-post/2018/08/22/how-to-apply-polar-opposites-for-success>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.importsbyglobetrotter.com/single-post/2018/08/22/how-to-apply-polar-opposites-for-success>