t.


   set         is a CSPICE set.  set must be declared as a character
               SpiceCell.
 
               On input, set may or may not contain the input item 
               as an element. 
 </PRE>
<h4><a name="Detailed_Output">Detailed_Output</a></h4>
<PRE>
 
   set          on output contains the difference of the input set and
                the input item. If the item is not an element of the
                set, the set is not changed.
 </PRE>
<h4><a name="Parameters">Parameters</a></h4>
<P