Which place is it?
It is a pen.
    src        edge_attr  dst
0     1   to the left of    8
1     1   to the left of    4
2     2   to the left of    4
3     2   to the left of    8
4     3   to the left of    4
5     3   to the left of    8
6     4  to the right of    1
7     4  to the right of    8
8     4  to the right of    3
9     4  to the right of    2
10    5   to the left of   14
11    5   to the left of    8
12    6   to the left of   14
13    6  to the right of   15
14    6  to the right of   11
15    6  to the right of   12
16    8  to the right of    9
17    8   to the left of    4
18    8  to the right of    5
19    8  to the right of    3
20    8  to the right of    2
21    8  to the right of    1
22    8  to the right of   14
23    9   to the left of    8
24   10  to the right of   11
25   10  to the right of   12
26   11   to the left of    6
27   11   to the left of   10
28   12   to the left of    6
29   12   to the left of   10
30   14   to the left of    8
31   14  to the right of    6
32   14  to the right of    5
33   15   to the left of    6