public static TemporalNetwork GetTestNetwork_weighted_2()
{
TemporalNetwork temporal_net = new TemporalNetwork();
temporal_net.AddTemporalEdge(1, "a", "b", 2);
temporal_net.AddTemporalEdge(2, "b", "c", 2);
temporal_net.AddTemporalEdge(4, "a", "b");
temporal_net.AddTemporalEdge(5, "b", "a");
return temporal_net;
}