RE>
 
   None. 
 </PRE>
<h4><a name="Exceptions">Exceptions</a></h4>
<PRE>
 
   1) If the input set argument is a SpiceCell of type other than
      character, the error SPICE(TYPEMISMATCH) is signaled.
 
   2) If the input set argument does not qualify as a CSPICE set, 
      the error SPICE(NOTASET) will be signaled.  CSPICE sets have
      their data elements sorted in increasing order and contain
      no duplicate data elements.
 
   3) If the input string pointer is null, the error SPICE(NULLPOINTER)
