<https://secure.gravatar.com/avatar/cede6c70f51763587caa2d49199f3359?s=96&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.monsterwoodshop.com/how-to-fix-orange-flames-on-gas-stove/>