Problem finding articulation points

[jdfandino10]

There is a problem when finding articulation points. Case:
10
4 5 6
4 5 6
4 5 6
1 2 3
1 2 3
1 2 3 7 8 9 10
6 8 9 10
6 7 9 10
6 7 8 10
6 7 8 9