K0
directed: false
vcount: 0
edges: {
}
( )
( )

K1
directed: false
vcount: 1
edges: {
}
( 0 )
( )

C4
directed: false
vcount: 4
edges: {
1 0
3 0
2 1
3 2
}
( 0 0 0 0 )
( 1 1 1 1 )

Undirected graph 1
directed: false
vcount: 2
edges: {
1 0
}
( 0 1 )
( 2 )

Undirected graph 2
directed: false
vcount: 3
edges: {
1 0
2 0
2 1
}
( 0 0 2 )
( 1 1 2 )

Directed graph 1
directed: true
vcount: 3
edges: {
0 1
1 2
2 0
2 1
}
( 0 0 2 )
( 1 1 1 1 )

Directed graph 2
directed: true
vcount: 4
edges: {
0 1
1 0
}
( 0 2 0 0 )
( 2 3 )