1 0 {2,3}
2 INF {4,5,6,13}
3 INF {}
4 INF {7,8}
5 INF {9,10}
6 INF {7,9,11}
7 INF {}
8 INF {12,13}
9 INF {}
10 INF {}
11 INF {}
12 INF {}
13 INF {14}
14 INF {}
