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   397     Node aNode(const InEdgeIt&) const { return Node(); } | 
   397     Node aNode(const InEdgeIt&) const { return Node(); } | 
   398     Node bNode(const InEdgeIt&) const { return Node(); } | 
   398     Node bNode(const InEdgeIt&) const { return Node(); } | 
   399   };  | 
   399   };  | 
   400   | 
   400   | 
   401   | 
   401   | 
   402   /// \brief Node-eraseable graph concept.  | 
   402   /// \brief Node-erasable graph concept.  | 
   403   ///  | 
   403   ///  | 
   404   /// A graph class which provides a function to   | 
   404   /// A graph class which provides a function to   | 
   405   /// delete any of its nodes.  | 
   405   /// delete any of its nodes.  | 
   406   class NodeEraseableGraphConcept : virtual public GraphConcept  | 
   406   class NodeErasableGraphConcept : virtual public GraphConcept  | 
   407   { | 
   407   { | 
   408   public:  | 
   408   public:  | 
   409     /// Deletes a node.  | 
   409     /// Deletes a node.  | 
   410     void erase(const Node& n) { } | 
   410     void erase(const Node& n) { } | 
   411   };  | 
   411   };  | 
   412   | 
   412   | 
   413   | 
   413   | 
   414   /// \brief Edge-eraseable graph concept.  | 
   414   /// \brief Edge-erasable graph concept.  | 
   415   ///   | 
   415   ///   | 
   416   /// A graph class which provides a function to delete any   | 
   416   /// A graph class which provides a function to delete any   | 
   417   /// of its edges.  | 
   417   /// of its edges.  | 
   418   class EdgeEraseableGraphConcept : virtual public GraphConcept  | 
   418   class EdgeErasableGraphConcept : virtual public GraphConcept  | 
   419   { | 
   419   { | 
   420   public:  | 
   420   public:  | 
   421     /// Deletes a node.  | 
   421     /// Deletes a node.  | 
   422     void erase(const Edge& n) { } | 
   422     void erase(const Edge& n) { } | 
   423   };  | 
   423   };  |