| postorder | R Documentation | 
Given a graph, this function returns the order the vertices are exited in a depth-first traversal.
postorder(g, root)
| g | (igraph) The graph. | 
| root | (integer) A vertex where the traversal should start. | 
A postorder is not always unique. For an acyclic graph, reversed postorder is equivalent to a topological sort.
(integer) A postorder of the graph.
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