What vehicle is the horse pulling?
The horse is pulling the carriage.
    src        edge_attr  dst
0     0  to the right of    1
1     0  to the right of   15
2     0  to the right of    5
3     0  to the right of    3
4     0  to the right of   10
5     1  to the right of   10
6     1  to the right of    9
7     1  to the right of    5
8     1   to the left of    0
9     1  to the right of    3
10    1  to the right of   15
11    2   to the left of    3
12    3          pulling    9
13    3             with    5
14    3          pulling    5
15    3  to the right of    9
16    3   to the left of    1
17    3   to the left of    0
18    3  to the right of    4
19    3  to the right of    2
20    3  to the right of    8
21    3  to the right of   12
22    4               on    9
23    4   to the left of    3
24    4   to the left of   15
25    5   to the left of    1
26    5   to the left of    0
27    5  to the right of    6
28    5        pulled by    3
29    5               on   13
30    6      in front of   12
31    6   to the left of   11
32    6   to the left of    8
33    6   to the left of    9
34    6   to the left of    5
35    8  to the right of    6
36    8  to the right of   11
37    8   to the left of    3
38    9        pulled by    3
39    9   to the left of   15
40    9  to the right of    6
41    9   to the left of    3
42    9   to the left of   10
43    9   to the left of    1
44   10   to the left of    1
45   10  to the right of    9
46   10   to the left of    0
47   11  to the right of    6
48   11   to the left of    8
49   12   to the left of   15
50   12   to the left of    3
51   12           behind    6
52   15  to the right of   12
53   15  to the right of    9
54   15  to the right of    4
55   15   to the left of    0
56   15   to the left of    1