% HSE seminar 1; 2022
*Vertices 6
1 "a" 
2 "b" 
3 "c" 
4 "d" 
5 "e" 
6 "f" 
*Arcs
1 2
2 1
1 4
1 6
2 6
3 3
5 3
5 6
*Edges
2 5
3 4