# Directed graph: graph.txt 
# Nodes: 20 Edges: 76
# FromNodeId	ToNodeId
1	0
2	0
3	0
3	1
3	2
4	0
5	1
5	2
5	3
6	3
7	0
7	1
7	2
7	3
8	0
8	1
8	2
8	3
8	5
8	6
8	7
9	1
9	5
9	7
9	8
10	0
10	1
10	2
10	3
10	4
10	5
10	6
10	7
10	8
10	9
11	1
11	4
11	9
11	10
12	0
12	2
13	5
14	0
15	1
15	3
16	13
17	7
18	0
18	1
18	2
18	3
18	4
18	5
18	6
18	7
18	8
18	9
18	10
18	11
18	14
18	15
18	17
19	0
19	1
19	2
19	3
19	4
19	5
19	6
19	7
19	8
19	9
19	10
19	11
19	17
19	18