public List<V> getVerticesInPostOrder(GDirectedGraph<V, E> graph) {
		List<V> postOrder = asList(GraphAlgorithms.getVerticesInPostOrder(graph, this));
		return postOrder;
	}
Returns all vertices in the given graph in the depth-first order.   The order will 
be post-order for a top-down navigator and pre-order for a bottom-up navigator.

@param graph the graph
@return the ordered vertices
Ghidra/Framework/Graph/src/main/java/ghidra/graph/algo/GraphNavigator.java