public Iterator<Edge> removedEdgeIterator(){
  return removedEdgeList != null ? removedEdgeList.iterator() : new NullIterator<Edge>();
}

public Iterator < Edge > removedEdgeIterator ( ) { return removedEdgeList != null ? removedEdgeList . iterator ( ) : new NullIterator < Edge > ( ) ; }
get an iterator over edges removed from this cfg .
