Is the train to the left or to the right of the person that is on the bridge?
The train is to the right of the person.
    src        edge_attr  dst
0     2            below    8
1     2      in front of    5
2     2  to the right of   11
3     2  to the right of    7
4     2   to the left of   14
5     2   to the left of   13
6     2               by   12
7     4   to the left of   13
8     5           behind    2
9     6   to the left of   13
10    6   to the left of   12
11    7   to the left of    2
12    8               in    0
13    8            above    2
14   11               on    5
15   11   to the left of    2
16   12  to the right of    6
17   13  to the right of    6
18   13               by    6
19   13  to the right of    4
20   13  to the right of    2
21   14  to the right of    2