small graph, k=0
directed: false
vcount: 5
edges: {
1 0
3 0
2 1
4 2
3 2
4 3
}


null graph, k=0
directed: false
vcount: 0
edges: {
}


null graph, k=1
directed: false
vcount: 1
edges: {
}


null graph, k=3
directed: false
vcount: 5
edges: {
1 0
3 0
2 1
4 2
4 3
}


singleton graph, k=0
directed: false
vcount: 1
edges: {
}


small directed graph, k=0
directed: true
vcount: 5
edges: {
0 1
0 3
1 2
2 4
2 3
3 4
}


singleton graph, k=3
directed: false
vcount: 11
edges: {
1 0
3 0
2 1
4 2
4 3
6 0
5 1
8 0
5 3
7 1
6 2
9 2
7 4
9 3
8 4
10 5
10 6
10 7
10 8
10 9
}


P_2, k=2
directed: false
vcount: 11
edges: {
1 0
3 0
2 1
4 2
4 3
6 0
5 1
8 0
5 3
7 1
6 2
9 2
7 4
9 3
8 4
10 5
10 6
10 7
10 8
10 9
}