/**

 \dir lemon

 \brief Base include directory of LEMON

 This is the base directory of lemon includes, so each include file must be

 prefixed with this, e.g.

 \code

 #include<lemon/list_graph.h>

 #include<lemon/dijkstra.h>

 \endcode

 */

 /**

 \dir concept

 \brief Concept descriptors and checking classes

 This directory contains the concept descriptors and concept checkers. As a user

 you typically don't have to deal with these files.

 */