What vehicle is not displayed?
The vehicle is a taxi.
    src        edge_attr  dst
0     1  to the right of    4
1     1               of    3
2     1   to the left of    9
3     4            below    3
4     4   to the left of    1
5     4   to the left of    8
6     5   to the left of   10
7     6            below    3
8     8  to the right of    4
9     9  to the right of    1
10   10      in front of   11
11   10  to the right of    5
12   11           behind   10