public void removeParentBChildZaz(ParentBChildZaz o) {
   if (o.getParentBParent() != this) {
     return;
   }
   o.setParentBParentWithoutPercolation(null);
   this.removeParentBChildZazWithoutPercolation(o);
 }
 public void addParentBChildZaz(ParentBChildZaz o) {
   if (o.getParentBParent() == this) {
     return;
   }
   o.setParentBParentWithoutPercolation((ParentBParent) this);
   this.addParentBChildZazWithoutPercolation(o);
 }