Which place is it?
It is an airport.
    src        edge_attr  dst
0     0   to the left of    1
1     0   to the left of    3
2     1  to the right of    0
3     3  to the right of    0
4     4  to the right of    6
5     4  to the right of    5
6     5  to the right of   11
7     5   to the left of    6
8     5   to the left of    4
9     6  to the right of    5
10    6   to the left of    4
11    7  to the right of   10
12   10   to the left of    7
13   11   to the left of    5