<https://secure.gravatar.com/avatar/1c04d39291dac8df7f3389e4eb903b37?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://educationgalaxy.online/how-do-you-replace-plumbing-in-an-old-house/>