Graphviz

digraph G {
2:    node1;
3:    node2;
4:    node3;
5:
6:    node1 -> node2 [label="edge_1_2"];
7:    node1 -> node3 [label="edge_1_3"];
8:    node2 -> node3 [label="edge_2_3"];
9:  }

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