Where is the tree?
The tree is on the road.
    src        edge_attr  dst
0     0  to the right of   15
1     0   to the left of    6
2     0   to the left of    3
3     1  to the right of   12
4     3  to the right of   10
5     3  to the right of    0
6     3   to the left of    7
7     3   to the left of    5
8     3            above    4
9     4  to the right of   15
10    5   to the left of    7
11    5  to the right of   10
12    5  to the right of    3
13    5   to the left of   13
14    6  to the right of    0
15    6  to the right of   15
16    6  to the right of   10
17    7  to the right of   12
18    7  to the right of    8
19    7  to the right of    5
20    7  to the right of    3
21    8               on   16
22    8   to the left of   13
23    8   to the left of    7
24    8  to the right of   10
25    9  to the right of   15
26   10   to the left of    8
27   10   to the left of   12
28   10   to the left of    3
29   10   to the left of    5
30   10   to the left of    6
31   12   to the left of   13
32   12   to the left of    1
33   12  to the right of   15
34   12  to the right of   10
35   12   to the left of    7
36   12          holding    0
37   12          holding    4
38   13  to the right of   12
39   13  to the right of    8
40   13  to the right of    5
41   15   to the left of    0
42   15   to the left of    9
43   15   to the left of   12
44   15   to the left of    4
45   15   to the left of    6