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