*Vertices 10 5
1 "1"
2 "3"
3 "5"
4 "7"
5 "9"
6 "2"
7 "4"
8 "6"
9 "8"
10 "10"
*Edges
1 6
6 2
2 7
7 3
3 8
8 4
4 9
9 5
5 10
1 10