Which kind of vehicle is not colorful?
The vehicle is a taxi.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of    1
2     1  to the right of   10
3     1      in front of    2
4     1  to the right of    4
5     1  to the right of    0
6     2  to the right of    0
7     2  to the right of   10
8     2           behind    1
9     2    surrounded by    9
10    2  to the right of    4
11    3  to the right of   11
12    4   to the left of    9
13    4   to the left of    2
14    4  to the right of   11
15    4   to the left of    1
16    6   to the left of   10
17    6  to the right of    7
18    6               on   11
19    7   to the left of    6
20    7   to the left of   10
21    9           around    2
22    9      surrounding    2
23    9  to the right of   10
24    9  to the right of    4
25   10  to the right of    6
26   10   to the left of    9
27   10  to the right of   11
28   10  to the right of    7
29   10               on    8
30   10   to the left of    2
31   10   to the left of    1
32   11   to the left of    3
33   11   to the left of    4
34   11   to the left of   10