One block, one vertex.
directed: false
vcount: 1
edges: {
}

One block, two clusters, 6 and 4 vertices in cluster, complete bipartite.
directed: false
vcount: 10
edges: {
0 6
0 7
0 8
0 9
1 6
1 7
1 8
1 9
2 6
2 7
2 8
2 9
3 6
3 7
3 8
3 9
4 6
4 7
4 8
4 9
5 6
5 7
5 8
5 9
}

Two blocks, two clusters each, 3 and 2 vertices in cluster, each vertex connected to every other, except those in the same cluster.
directed: false
vcount: 10
edges: {
0 3
0 4
0 5
0 6
0 7
0 8
0 9
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 3
2 4
2 5
2 6
2 7
2 8
2 9
3 5
3 6
3 7
3 8
3 9
4 5
4 6
4 7
4 8
4 9
5 8
5 9
6 8
6 9
7 8
7 9
}

