Set tmpSet = new HashSet();
Set tmpSet = null;
	public Graph filter(Graph g) {		if(!_inited) {			System.err.println("Error: Degree filter has not been initialized.");			return null;		}		int i = _deg;		Set vertices = new HashSet();		Set tmpSet = new HashSet();		vertices.add(_center);		tmpSet = _center.outEdges();		vertices.addAll(tmpSet);		i--;		// grab vertices		for(int j = i; j > 0; j--) {			tmpSet = getOutEdges(tmpSet);			vertices.addAll(tmpSet);		}		return g.subset(vertices);	}