&gt; &gt; &gt; &gt; &gt; NO!  Wash your mouth out with soap!
&gt; &gt; &gt; &gt; &gt; &gt;
&gt; &gt; &gt; &gt; &gt; &gt; &gt;and how can we tell whether they are "present" or
&gt; &gt; not, or whether
&gt; &gt; &gt; &gt; &gt; &gt; &gt;the set itself is present?  These are the sorts of
&gt; &gt; &gt; &gt; questions anyone
&gt; &gt; &gt; &gt; &gt; &gt; &gt;might have when reading this definition.
&gt; &gt; &gt; &gt; &gt; &gt; &gt;
&gt; &gt; &gt; &gt; &gt; &gt; &gt;My recommendation is that we should focus on 