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