class IntSet11c extends IntSet11
{
// Adds a copy to sets implemented using linked lists
// Copy method uses iteration with "stack and reverse" technique.

 public IntSet11c()
 {
  super();
 }

 private IntSet11c(Cell l)
 {
  list=l;
 }
 
 public IntSet11c copy()
 {
  Cell list1=null,temp=null;
  for(Cell ptr=list; ptr!=null; ptr=ptr.next)
      temp = new Cell(ptr.first,temp);
  for(; temp!=null; temp=temp.next)
      list1 = new Cell(temp.first,list1);
  return new IntSet11c(list1);
 }
}