Enumeration used as DFS edge markers. Possible values are: TREE_EDGE, BACK_EDGE, and FORW_EDGE. When a DFS visit is executed, we call TREE_EDGE an edge of the spanning tree induced by the DFS. An edge that si not in the spanning tree is called BACK_EDGE or FORW_EDGE depending on a fixed extremal vertex (See the "DFS_edge" method for more details).

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