% HSE example 1; March 2021
*Vertices 12
1 "a" 
2 "b" 
3 "c" 
4 "d" 
5 "e" 
6 "f" 
7 "g" 
8 "h" 
9 "i" 
10 "j" 
11 "k" 
12 "l" 
*Arcs
1 2
2 1
1 4
1 6
2 6
3 2
3 3
3 7
3 7
5 3
5 6
5 8
6 11
8 4
10 8
12 5
12 7
8 12
12 8
*Edges
2 5
3 4
5 7
6 8