+ bool is_occupied_area(int _a, int _b);
+ ConnectorType is_other_connection_area(int _a, int _b);
+ virtual void save(FILE *archivo) = 0;
+ virtual bool check_connection()=0;
+// virtual ConnectorType is_connection_area(int _a, int _b)=0;
+ virtual ConnectorType get_connector_type( int _a, int _b );