What is this man in front of?
The man is in front of the tree.
    src        edge_attr  dst
0     2   to the left of   15
1     4  to the right of   16
2     4   to the left of   15
3     4  to the right of   13
4     5  to the right of   11
5     6      in front of   10
6     8               on    7
7    10           behind    6
8    11   to the left of    5
9    13   to the left of    4
10   13  to the right of   16
11   15  to the right of    4
12   15  to the right of    2
13   16   to the left of    4
14   16   to the left of   13