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 0 -> 2 1 3 
1 -> 0 2 
2 -> 0 0 
3 -> 5 4 6 
4 -> 5 3 5 
5 -> 3 
6 -> 7 11 
7 -> 9 6 8 
8 -> 9 
9 -> 7 10 
10 -> 9 6 
11 -> 14 12 
12 -> 13 14 13 
13 -> 12 14 
14 -> 11 
current node 0 time 1
current node 2 time 2
2 
returning from 2
current node 1 time 3
1 
returning from 1
current node 3 time 4
current node 5 time 5
5 
returning from 5
current node 4 time 6
4 
returning from 4
current node 6 time 7
current node 7 time 8
current node 9 time 9
current node 10 time 10
10 
returning from 10
returning from 9
current node 8 time 11
8 
returning from 8
returning from 7
current node 11 time 12
current node 14 time 13
14 
returning from 14
current node 12 time 14
current node 13 time 15
13 
returning from 13
returning from 12
returning from 11
returning from 6
returning from 3
returning from 0
8