Is the policeman to the left of the horse that the person is riding?
Yes, the policeman is to the left of the horse.
    src        edge_attr  dst
0     0   to the left of    8
1     0   to the left of   16
2     0   to the left of    9
3     0   to the left of    7
4     1   to the left of   16
5     1           riding   15
6     1  to the right of    5
7     1   to the left of    7
8     1   to the left of   13
9     1   to the left of    6
10    2  to the right of   15
11    2  to the right of   16
12    2   to the left of   12
13    2   to the left of   10
14    5   to the left of    1
15    5   to the left of   13
16    5   to the left of    6
17    6  to the right of    5
18    6  to the right of   15
19    6  to the right of    1
20    6   to the left of   12
21    7   to the left of    8
22    7  to the right of    0
23    7  to the right of    1
24    8          wearing    9
25    8          wearing    2
26    8           riding   13
27    8  to the right of   15
28    8  to the right of    7
29    8               on   13
30    8   to the left of   12
31    8   to the left of   10
32    8  to the right of   16
33    8  to the right of    0
34    9  to the right of    0
35   10   to the left of   12
36   10  to the right of    2
37   10  to the right of   15
38   10  to the right of    8
39   10               on   13
40   12  to the right of    6
41   12  to the right of   10
42   12  to the right of    8
43   12  to the right of    2
44   13  to the right of    5
45   13  to the right of   15
46   13  to the right of    1
47   15   to the left of    2
48   15   to the left of    6
49   15   to the left of   10
50   15   to the left of    8
51   15   to the left of   16
52   15   to the left of   13
53   16   to the left of    8
54   16  to the right of   15
55   16  to the right of    1
56   16   to the left of    2
57   16  to the right of    0