A sample graph, a wee bit small
David Kaplin

This is a comment
The only constraint on comments
is that they must not begin with a number
as the first character of a line
Here are the nodes
0,0,0
1,0,1
2,0,2
3,1,1
4,2,1
5,5,1
6,5,2
7,5,3
8,4,3
9,4,2
10,4,1
11,4,4
12,3,0
13,4,0
14,5,0
Here are the edges
0,1
1,2
1,3
4,3
5,6
7,6
8,9
10,9
11,8
12,13
14,13
14,5
That's it