directed: false
vcount: 6
edges: {
2 0
3 1
4 2
3 2
5 3
}
directed: false
vcount: 8
edges: {
3 0
5 2
4 2
4 1
6 1
1 0
7 0
}
directed: false
vcount: 2
edges: {
1 0
}