What color is the stop sign?
The stop sign is white.
    src        edge_attr  dst
0     0   to the left of    9
1     1   to the left of   11
2     1   to the left of    5
3     2   to the left of    7
4     2  to the right of    8
5     3  to the right of    4
6     4   to the left of    3
7     5  to the right of    1
8     6   to the left of   18
9     7  to the right of    2
10    7  to the right of   10
11    7  to the right of    8
12    8   to the left of    2
13    8       covered in   15
14    8   to the left of    7
15    9  to the right of    0
16    9   to the left of   12
17   10  to the right of   13
18   10   to the left of    7
19   11  to the right of    1
20   12   to the left of   16
21   12  to the right of    9
22   13   on the side of   14
23   13  to the right of   15
24   13   to the left of   10
25   13  to the right of   17
26   15   on the side of   14
27   15   to the left of   13
28   16  to the right of   12
29   17   to the left of   13
30   18  to the right of    6