     <p>
        <code class="literal">'{[5,20)}'::int8multirange - '{[10,15)}'::int8multirange</code>
        → <code class="returnvalue">{[5,10), [15,20)}</code>
       </p></td></tr></tbody></table></div></div><br class="table-break" /><p>
   The left-of/right-of/adjacent operators always return false when an empty
   range or multirange is involved; that is, an empty range is not considered to
   be either before or after any other range.
  </p><p>
   Elsewhere empty ranges and multiranges are treated