# This is the initial graph from http://www.ams.org/samplings/feature-column/fcarc-pagerank

1 -> 2
1 -> 3
2 -> 4

3 -> 5
3 -> 2

4 -> 5
4 -> 6
4 -> 2

5 -> 7
5 -> 8
5 -> 6

6 -> 8

7 -> 1
7 -> 5
7 -> 8

8 -> 6
8 -> 7