Where are the passengers?
The passengers are on the station.
    src        edge_attr  dst
0     0   to the left of   14
1     0   to the left of    7
2     1   to the left of   12
3     1  to the right of    3
4     2  to the right of    3
5     2  to the right of    4
6     3               at    2
7     3   to the left of    2
8     3   to the left of    1
9     3   to the left of   12
10    3   to the left of    8
11    4   to the left of    2
12    5   to the left of    9
13    5  to the right of    6
14    6               on    2
15    6   to the left of    5
16    6   to the left of    8
17    7               at    2
18    7  to the right of    0
19    7   to the left of   14
20    8   to the left of    9
21    8  to the right of    6
22    8  to the right of    3
23    9  to the right of    5
24    9           inside    2
25    9   to the left of   11
26    9               in   13
27    9  to the right of    8
28   11  to the right of    9
29   12  to the right of    1
30   12  to the right of    3
31   14  to the right of    0
32   14  to the right of    7