data/cycle/graph_description/medium/graph1000.txt

In an undirected graph, (i,j) means that node i and node j are connected with an undirected edge.
The nodes are numbered from 0 to 11, and the edges are: (2,4) (4,5) (1,9) (10,4) (1,7) (8,4) (3,6) (0,1) (2,0) (11,7) (6,7) (5,0).