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No vertices, should give error for impossible starting vertex.
One vertex.
0
All vertices of a graph, IGRAPH_OUT:
0 1 2 3 4
1 3 4
0 1 2 3 4
3 4
4
5
All vertices of a graph, IGRAPH_IN:
0 2
0 1 2
0 2
0 1 2 3
0 1 2 3 4
5
All vertices of a graph, IGRAPH_ALL:
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
5
All vertices of a graph, undirected:
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
5
Check for invalid mode error handling.
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