Mine

RewriteRule ^/(images|links)/(.*) $0
RewriteRule ^/contact$ /contact.php
RewriteRule ^/error-codes$ /error-codes.php
RewriteRule ^/file-names$ /file-names.php
RewriteRule ^/startup-processes$ /startup-processes.php
RewriteRule ^/privacy$ /privacy.php

RewriteRule ^/error-codes/([A-Za-z0-9-]+)/?$ /error-listing.php?listing=$1