There are lots of examples of auxiliary methods. Here&#x27;s an example of using around-methods to add slot-caching logic to a project for formula rendering: <a href="https:&#x2F;&#x2F;bitbucket.org&#x2F;tarballs_are_good&#x2F;formulador&#x2F;src&#x2F;639107f9266d5c4c2c679390f89153fe449bc201&#x2F;boxes.lisp?at=default&amp;fileviewer=file-view-default#boxes.lisp-60" rel="nofollow">https:&#x2F;&#x2F;bitbucket.org&#x2F;tarballs_are_good&#x2F;formulador&#x2F;src&#x2F;63910...</a>