What kind of vehicle has the same color as the sky?
The bus is the same color as the sky.
    src        edge_attr  dst
0     0  to the right of   13
1     1      standing on    0
2     1  to the right of   13
3     1  to the right of   19
4     2  to the right of    9
5     2  to the right of   10
6     2   to the left of   19
7     2  to the right of   12
8     2  to the right of    4
9     2  to the right of   11
10    2  to the right of   15
11    4  to the right of    5
12    4   to the left of   10
13    4   to the left of    9
14    4   to the left of    2
15    5   to the left of   13
16    5   to the left of   15
17    5   to the left of    9
18    5   to the left of   10
19    5   to the left of    4
20    5               on   14
21    5   to the left of   11
22    9  to the right of    5
23    9   to the left of    2
24    9  to the right of   15
25    9  to the right of    4
26   10   to the left of    2
27   10  to the right of    5
28   10  to the right of   15
29   10  to the right of   12
30   10  to the right of    4
31   10          holding   11
32   11   to the left of    2
33   11  to the right of   15
34   11  to the right of   12
35   11  to the right of    5
36   12   to the left of   10
37   12   to the left of    2
38   12   to the left of   11
39   13   to the left of    1
40   13  to the right of    5
41   13   to the left of    0
42   14   to the left of   17
43   14   to the left of   18
44   15   to the left of    2
45   15   to the left of   11
46   15   to the left of   10
47   15   to the left of    9
48   15  to the right of    5
49   16               of    8
50   17  to the right of   14
51   18  to the right of   14
52   19   to the left of    1
53   19  to the right of    2