Who is in front of the wall?
The men are in front of the wall.
     src        edge_attr  dst
0      0   to the left of   21
1      0   to the left of   26
2      0  to the right of   18
3      0   to the left of   14
4      0   to the left of   23
..   ...              ...  ...
106   26  to the right of   19
107   26  to the right of   25
108   26  to the right of    1
109   26  to the right of    2
110   26  to the right of    0

[111 rows x 3 columns]