# Undirected graph (each unordered pair of nodes is saved once): graphviz/sample_ungraph1.txt
# Nodes: 30 Edges: 40
# NodeId	NodeId
0	5
0	13
1	8
1	9
1	28
2	7
2	10
2	12
3	10
3	19
3	20
4	15
4	28
5	17
5	29
6	13
6	23
7	19
7	24
7	26
8	23
8	24
9	14
9	17
9	18
9	21
10	22
11	13
11	23
13	18
13	25
14	15
16	22
18	21
18	27
19	23
20	28
23	27
24	26
25	26
