      is signaled.
</PRE>
<h4><a name="Files">Files</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Particulars">Particulars</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Examples">Examples</a></h4>
<PRE>
 
   1) In the following example, the element &quot;PLUTO&quot; is removed from 
      the character set planets and inserted into the character set 
      asteroids. 

         #include &quot;SpiceUsr.h&quot;
                .
                .
                .
         /.
         Declare the sets wit