Who is looking at the train?
The boy is looking at the train.
    src        edge_attr  dst
0     0   to the left of   11
1     0   to the left of    1
2     0   to the left of    9
3     0   to the left of    2
4     1  to the right of    0
5     2         watching    0
6     2  to the right of    0
7     2      looking out    6
8     2          wearing    3
9     2       looking at    0
10    2  to the right of    5
11    5   to the left of   10
12    5   to the left of    2
13    5   to the left of    9
14    8   to the left of   11
15    9  to the right of    5
16    9  to the right of    0
17   10               of    2
18   10   to the left of   11
19   10  to the right of    5
20   11               of    2
21   11  to the right of    8
22   11  to the right of   10
23   11  to the right of    0