Which place is it?
It is an airport.
    src        edge_attr  dst
0     0  to the right of   14
1     0  to the right of    7
2     0  to the right of   12
3     0  to the right of   18
4     1   to the left of    8
5     2   to the left of   17
6     3   to the left of    9
7     3   to the left of    5
8     4  to the right of   18
9     4  to the right of    6
10    5  to the right of    3
11    6   to the left of    4
12    7   to the left of    0
13    7  to the right of    8
14    8  to the right of   11
15    8   to the left of   12
16    8  to the right of    1
17    8   to the left of    7
18    8   to the left of   14
19    9  to the right of    3
20   10  to the right of   15
21   11   to the left of    8
22   12  to the right of    8
23   12   to the left of    0
24   14  to the right of    8
25   14   to the left of    0
26   15   to the left of   10
27   17  to the right of    2
28   18   to the left of    0
29   18   to the left of    4