Of what color is the cart in the center?
The cart is yellow.
    src        edge_attr  dst
0     0               on   15
1     0         crossing   15
2     0   to the left of   19
3     1  to the right of    5
4     1  to the right of    6
5     1  to the right of   14
6     1   to the left of   20
7     2          next to   20
8     4  to the right of   17
9     5   to the left of    1
10    5   to the left of   11
11    6   to the left of    1
12    6   to the left of    9
13    6   to the left of   11
14    7   to the left of    9
15    8   to the left of   14
16    9  to the right of    6
17    9  to the right of    7
18   10   to the left of   16
19   11  to the right of    5
20   11               in    1
21   11   to the left of   20
22   11  to the right of    6
23   13               in   12
24   14       walking on    3
25   14   to the left of    1
26   14  to the right of    8
27   14       looking at    3
28   14      standing in    3
29   16   to the left of   19
30   16  to the right of   10
31   17   to the left of    4
32   19  to the right of   16
33   19  to the right of    0
34   20  to the right of   11
35   20             near    2
36   20  to the right of    1