Vertices in biconnected components:
{
  0: ( 6 5 )
  1: ( 5 4 2 )
  2: ( 3 2 1 0 )
  3: ( 8 7 )
}
Edges in biconnected components:
{
  0: ( 7 )
  1: ( 6 5 4 )
  2: ( 3 2 1 0 )
  3: ( 8 )
}
Edges in biconnected component spanning trees:
{
  0: ( 7 )
  1: ( 5 4 )
  2: ( 2 1 0 )
  3: ( 8 )
}
Articulation points:
( 5 2 )
