code: function _unfold_subgraph(sub){
  
  	// Restore to graph.
  	// console.log('   unfold # (' + sub.all_nodes().length + ', ' +
  	// 	    sub.all_edges().length + ')');
  	each(sub.all_nodes(), function(node){
  	    anchor.add_node(node);
  	});
  	each(sub.all_edges(), function(edge){
  	    anchor.add_edge(edge);
  	});
      }
docs: For any entity, remove its referenced individuals and re-add them to the graph.