Are there any zebras to the left of the man?
No, the zebra is to the right of the man.
    src        edge_attr  dst
0     0   to the left of    1
1     0               of   13
2     1  to the right of    2
3     1  to the right of    0
4     1  to the right of   13
..  ...              ...  ...
56   16  to the right of   10
57   17               of   15
58   17   to the left of   14
59   17   to the left of    9
60   17   to the left of    4

[61 rows x 3 columns]