Enumeration used in visit algorithms. Possible values are OUTGOING
and INCOMING. For example, in the "simple_DFS" method for a directed
graph "dire_graph", you can specify the direction of the edges along
which you want walk; if you specify OUTGOING (default), you move from
a node only along the outgoing edges; if you specify INCOMING, you
move from a node only along the incoming edges.
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