public static TemporalNetwork GetTestNetwork3()
{
TemporalNetwork temporal_net = new TemporalNetwork();
temporal_net.AddTemporalEdge(1, "a", "b");
temporal_net.AddTemporalEdge(2, "a", "c");
temporal_net.AddTemporalEdge(7, "c", "e");
temporal_net.AddTemporalEdge(8, "c", "g");
temporal_net.AddTemporalEdge(9, "g", "f");
temporal_net.AddTemporalEdge(10, "f", "h");
return temporal_net;
}