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    21   | 
    21   | 
    22 ///\ingroup graph_concepts  | 
    22 ///\ingroup graph_concepts  | 
    23 ///\file  | 
    23 ///\file  | 
    24 ///\brief The concept of directed graphs.  | 
    24 ///\brief The concept of directed graphs.  | 
    25   | 
    25   | 
    26 #include <lemon/bits/invalid.h>  | 
    26 #include <lemon/core.h>  | 
    27 #include <lemon/bits/utility.h>  | 
         | 
    28 #include <lemon/concepts/maps.h>  | 
    27 #include <lemon/concepts/maps.h>  | 
    29 #include <lemon/concept_check.h>  | 
    28 #include <lemon/concept_check.h>  | 
    30 #include <lemon/concepts/graph_components.h>  | 
    29 #include <lemon/concepts/graph_components.h>  | 
    31   | 
    30   | 
    32 namespace lemon { | 
    31 namespace lemon { |