What is the cart in front of?
The cart is in front of the train.
    src        edge_attr  dst
0     1   to the left of   10
1     1   on the side of   14
2     2  to the right of   11
3     2  to the right of   13
4     3          wearing    2
5     3  to the right of   13
6     3  to the right of   11
7     3          wearing   12
8     4  to the right of    9
9     4  to the right of    8
10    5  to the right of    9
11    5  to the right of    8
12    6      in front of   14
13    6   to the left of   11
14    6  to the right of    7
15    6   to the left of   13
16    7   to the left of   14
17    7   to the left of    6
18    8   to the left of    5
19    8   to the left of    4
20    8   to the left of   14
21    8      standing on    9
22    8       walking on    9
23    9   to the left of    5
24    9   to the left of    4
25   10  on the front of   14
26   10   to the left of   11
27   10  to the right of    1
28   10   to the left of   13
29   11   to the left of    3
30   11  to the right of   13
31   11  to the right of    6
32   11   to the left of   16
33   11   to the left of   12
34   11  to the right of   10
35   11  to the right of   14
36   11   to the left of   15
37   11   to the left of    2
38   12  to the right of   11
39   13   to the left of   16
40   13   to the left of   15
41   13  to the right of   14
42   13   to the left of    3
43   13  to the right of   10
44   13  to the right of    6
45   13   to the left of   11
46   13   to the left of    2
47   14   to the left of   13
48   14  to the right of    7
49   14               on    5
50   14           behind    6
51   14  to the right of    8
52   14   to the left of   11
53   15               on   16
54   15  to the right of   13
55   15  to the right of   11
56   16   on the side of    5
57   16  to the right of   13
58   16  to the right of   11